Alstom Digicode_maintenance Handbook On Audio Frequency Track Circuit Ver2(1) 3n4s6u

Hkkjr ljdkj GOVERNMENT OF INDIA jsy ea=ky; MINISTRY OF RAILWAYS

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MAINTENANCE HANDBOOK ON

AUDIO FREQUENCY TRACK CIRCUIT

dSeVsd@,l@izkStsDV@2013&14@,pch&, ,Q Vhlh@2-0 CAMTECH/S/PROJ/2013-14/HB-AFTC.2.0

ebZ 2013 MAY 2013

egkjktiqj] Xokfy;j & 474005 MAHARAJPUR, GWALIOR – 474 005

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FOREWORD Track circuits detect presence of train vehicles on different portions of track and hence play a vital role in signalling. Audio Frequency Track Circuit is one of such types which has its own advantages. Audio Frequency Track Circuits have been installed on various stations as well as sections of Indian Railways including Intermediate Block Signalling and Automatic Signalling sections. CAMTECH is continuously making efforts in documentation and upgradation of information on advanced maintenance practices. This handbook prepared on the subject is a step further in this direction. I hope that this handbook will be helpful for the signal maintenance personnel in updating their knowledge and maintaining the system.

CAMTECH Gwalior Date:

A.R.Tupe Executive Director

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PREFACE The t-less Audio Frequency Track Circuits have several advantages over conventional track circuits and these are unaffected by the interference due to traction harmonics in electrified area. AFTCs have applications in straight sections and point zones of Station area as well as in proving of Block section including Automatic Signalling section. This handbook has been prepared to help the field personnel in efficiently maintaining Audio Frequency Track Circuits installed in their section. Apart from general overview, installation guidelines, maintenance instructions and do’s & don’ts the handbook also covers sections containing information on AFTCs of RDSO approved manufacturers. It is clarified that this handbook does not supersede any existing provisions laid down in Signal Engineering Manual, Railway Board publications and RDSO publications. This handbook is not statutory and instructions given in it are for the purpose of guidance only. We are sincerely thankful to Shri Nirala Katiyar, Sr.D.S.T.E./Sig/New Delhi/Northern Railway., M/s Alstom, M/s Siemens, M/s Bombardier, M/s Ansaldo and field personnel who helped us in preparation of the handbook. Since technological upgradation and learning is a continuous process, you may feel the need for some addition/modification in this handbook. If so, please feel free to give your comments on email address [email protected] or write to us at Indian Railways Centre for Advanced Maintenance Technology, In front of Adityaz Hotel, Airport Road, Maharajpur, Gwalior (M.P.) 474005.

CAMTECH Gwalior Date:

D.K.M.Yadav Jt .Director (S&T)

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CONTENTS vuqHkkx

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Description

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Foreword Preface Contents Correction Slip Disclaimer

1.1 1.2 1.3 1.4 1.5

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1.6 1.7 1.8 1.9 1.10

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Audio frequency track circuit Introduction Advantages Main modules Functions of various modules Electrical Separation t (ESJ) Overlap Zone Classification of AFTC Configurations of AFTC Principle of working RDSO approved firms

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Installation Introduction General installation guidelines Traction return and crossbonding at termination of AFTC Preparation of Frequency allocation plan Preparation of Cable Core plan Testing of Cables Indoor installation Outdoor installation

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ABB T1-21 Audio Frequency Track Circuit Introduction System Composition Frequency allocation plan Technical data Cabling scheme Installation guidelines Testing and commissioning

Page No.

Section

I

II 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 III 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8

Adjustment of AFTC equipment

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IV VI VIII X XII

1 1 1 2 3 4 4 5 5 6

1 1 2 4 4 4 4 5

1 1 3 3 4 4 5 7

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IV

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Maintenance & Inspections Fault diagnosis and rectification Tools/Equipments required Siemens FTG-S Remote- fed, Coded Audio frequency track circuit Introduction Classification Technical data System composition Cabling scheme Track side connections Frequency and data coding allocation Frequency and bit pattern (Data) coding plugs Recording of parameters Maintenance Standard looping and gain setting Tools and measuring equipment Fault diagnosis /LED indicator combinations Alstom DIGI CODE Audio Frequency Track Circuit Introduction Classification System description Cabling scheme Technical data Cards information LED indications and testing points Maintenance Fault diagnosis Tool kit Troubleshooting Flowcharts Fault diagnosis /LED indicator combinations

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8 8 9

1 2 2 3 7 7 9 9 10 10 12 13 14-17

1 1 2 4 4 5 6 9 11 12 14-15 16-21

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6.1 6.2 6.3 6.4 6.5 6.6

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Ansaldo UM71 Audio Frequency Track Circuit Introduction System composition Cabling scheme Technical data Gain setting Maintenance

7.1 7.2 7.3

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Preventive Maintenance Maintenance checks Testing with external shunt Precautions during maintenance

8.1 8.2

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Do’s & Don’ts Do’s Don’ts

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Frequently Asked Questions

Annex. I

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Abbreviations

Annex. II

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References

Section VI

VII

VIII

IX

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Page No.

1 1 5 5 6 9

1 2 3

1 1 1-2

ISSUE OF CORRECTION SLIPS

The correction slips to be issued in future for this handbook will be numbered as follows:

CAMTECH/S/PROJ/2013-14/HB-AFTC/2.0# XX date .......

Where “XX” is the serial number of the concerned correction slip (starting from 01 onwards). CORRECTION SLIPS ISSUED Sr. No. of Correction

Date of issue

Page no. and Item No. modified

Slip

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Remarks

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DISCLAIMER It is clarified that the information given in this handbook does not supersede any  existing provisions laid down in the Signal Engineering Manual, Railway Board and  RDSO  publications.  This  document  is  not  statuary  and  instructions  given  are  for  the purpose of guidance only. If at any point contradiction is observed, then SEM,  Railway  Board/RDSO  guidelines  may  be  referred  or  prevalent  Zonal  Railways  instructions may be followed.     ---------------------------------------------------------------------------------------------------If you have any suggestion & any specific comments, please write to us: person

:

Director (Signal & Telecommunication)

Postal Address

:

Centre for Advanced Maintenance Technology, Maharajpur, Gwalior (M.P.) Pin Code – 474 005

Phone

:

0751 - 2470185

Fax

:

0751 – 2470841

Email

:

[email protected]

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

1

Section I

vkWfM;ks fÝDosalh Vªsd lfdZV AUDIO FREQUENCY TRACK CIRCUIT 1.1 ifjp; Introduction Conventional Track circuits have been found to be affected by the high levels of interference due to traction harmonics present in AC or DC electrified areas. The tless Audio Frequency Track Circuit (AFTC) is the solution in such sections since they are immune to above interferences. The AFTC works with modulated signal in audio frequency range and its extremities are defined electrically by the use of tuned circuit techniques. AFTC conforms to IRS specification no.RDSO/SPN/146/2001. 1.2 ykHk Advantages  AFTC can be universally used in AC, DC and Non-RE sections. 

Electrical separation ts define AFTC geographical boundaries.



No insulation t is required except in point zone where adjacent AFTC is from different manufacturer or type of track circuit changes. Thus dependency on other departments is minimized.



AFTC has built-in time delay for picking up its relay hence separate slow to pick up TPR is not required.



Not affected by harmonics generated by Thyristor controlled locomotives as it uses FSK/MSK principle for signal transmission.



Both rails are available for traction return current.



Suitable for longer length track circuits.

 Suitable for IB and Automatic Signalling section.  Added safety with modulation (coding). 

Remote feeding upto 3 km possible.

1.3 eq[; Hkkx Main modules The Audio Frequency Track Circuit system consists of following modules: Table I

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Sr. No. 1. 2. 3. 4. 5. 6. 7. 8.

Description

Location

Transmitter (Tx) Receiver (Rx) Trackside Tuning Units (TU) Power Supply unit Output relay Leads/Connections and fastening to rails Rail Bonds Surge arrester

1 No. 1 No. 2 Nos., one at Tx end and other at Rx end 2 Nos., one at Tx end and other at Rx end 1 No., at Rx end At both ends At both ends 2 Nos., one for each tuning unit.

1.4 fofHkUu Hkkxksa ds dk;Z Functions of various modules (a) Transmitter (Tx) Transmitter generates and modulates audio frequency according to a scheme planned along with the receiver. (b) Track Tuning Unit (TTU) The electrical separation of adjacent track circuits is obtained by tuning a short length of track (about 20 metres) using tuning units. Each tuning unit offers low impedance to the frequency of adjacent track circuit and prevents its influence. (c) End Termination Unit (ETU) It is used at the start and the end of section provided with AFTC. It is also used in place of TTU for Centre fed arrangement or when the adjacent track circuit is of other type or of different manufacturer. An insulated rail t is normally provided beyond the ETU within one metre. (d) Receiver (Rx) The receiver receives the correct track circuit signal via tuning unit and recognizes it in quality (modulation or bit pattern) and in quantity (level or amplitude) and operates the output relay accordingly. More than one receiver may be required for point zone track circuit. (e) Power Supply Unit A common power supply unit generally feeds Transmitter and Receiver of two adjacent AF Track Circuits. [Input230V/110V (nominal) 50 Hz ± 2.5 Hz single-phase AC and gives output of 24 V DC] (f) Leads/Connections and fastening to rails For connecting Track Tuning Unit with Tx or Rx, Signalling cable or 6 quad cable (0.9 sq.mm dia) is used. For connection of Tuning Unit to track, thick cable of 25 sq.mm dia. conductor (Aluminium or Copper) is used. (g) Rail Bonds Imbalance in traction return current associated with rails in both 25 KV AC traction and 1500 V DC traction may cause damage to the AFTC equipment. To avoid this different types of bonds are provided depending upon the configuration of AFTC.

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(i) S bonds These are used in straight track circuit between two consecutive AFTCs of same manufacturer. This consists of two semi-loops each delimited between its centre tap and its connection point to the rail. The farther semi-loop of the S-bond is tuned to the operating frequency of track circuit. The other semi-loop is tuned to the operating frequency of neighbouring track circuit. An axle standing on the S-bond occupies both the near and advance track circuits thus causing overlapping of the two track circuits so that there is no detection gap. Fig.1.1 (a): S – bond (ii) End bonds or Alpha bonds (Termination bonds) These are used in the end of the track circuit as terminal bond. These are provided along with insulation t for separating AFTC with other type of track circuit (Conventional DC/AC track circuit) or AFTC of other manufacturer. For traction return current the center of alpha bond to be connected to next DC/AC track circuit or AFTC of other make. Fig.1.1 (b): Alpha bond (iii)Shunt bonds These are provided at the termination of AFTC whose adjacent section is non-track circuited (End of AFTC). Only insulation ts are provided for separating two AFTCs in point zone track circuits, if enough space is not available. Sbonds can be provided if enough space is available.

Fig.1.1 (c): Shunt bonds

(h)Relay Relay used shall be DC neutral line relay conforming to either specification no BRS 930A or K-50 type depending upon design. (i)Surge arrester The equipment is suitably protected against atmospheric voltage surges by provision of surge arrestor between tuning unit and Transmitter/Receiver in order to limit the harmful effects of lightning. 1.5 bySDVªhdy lsijs’ku TokbZaV Electrical Separation t (ESJ) Electrical isolation between two adjacent AFTCs consists of a rail bond and a tuning unit. The tuning unit is located in the trackside connection box and used to tune the electrical t to the relevant track circuit frequency.

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In the Fig.1.2 below, TU of frequency f3 offers high impedance to its own track circuit frequency f3 and low impedance (zero) to the adjacent track circuit frequency f5 and vice-versa. Thus electrical isolation is formed between these two track circuits.

Fig.1.2: Electrical Separation t Tuned Zone The tuned zone comprises a measured length of track which is used for forming ESJ. 1.6 vksojySi tksu Overlap Zone Overlap zone is the portion of tuned zone in which both the AFTC Relays drop when it is shunted by 0.15 Ohms resistance. Examples are given below.

Fig. 1.3 : Two adjacent AFTCs DT1 & DT2 A =Non-shunting zone of track circuit DT-2 B = Non-shunting zone of track circuit DT-1 C = Shunting zone of track circuit DT-1 and DT-2(Overlap zone) 1.7 ,,QVhlh dk oxhZdj.k Classification of AFTC (a)As per type of modulating signal (i)Non-coded In this type of AFTC, the modulating signal is not coded. (ii)Coded In this type of AFTC, the modulating signal is bit coded with digital message. Section I – Audio Frequency Track Circuit Click for Contents

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As bit coding of modulating signal enhances the safety, coded type track circuits are preferred over the non-coded type. (b)As per feeding arrangement (i)Locally fed In this arrangement, Tx, Rx, Power supplies to Tx and Rx and relay are kept in trackside location boxes. Track repeater relay is only kept at relay room. (ii)Remote fed In this arrangement, Tx, Rx, Power supplies to Tx and Rx and relay, all equipments are kept centrally in AFTC room, while tuning units are kept in trackside location boxes. 1.8

,,QVhlh ds foU;kl Configurations of AFTC AFTC can be configured in two ways (i) End fed In this configuration, Transmitter is provided at one end and Receiver is provided at the other end. (i)Centre fed Centre fed arrangement is provided when longer length of track circuit is used say beyond 900 mtrs. Tx is provided at the centre of the track circuit, while Rx is installed at both the ends of the track circuit.

1.9 dk;Z ds fl/kkar Principle of working AFTC works on Frequency Shift Keying (FSK) technique, where the carrier frequency is shifted between two frequencies close to each other. The basic carrier frequency (Audio Frequency) and the modulating frequency are generated by the Transmitter. Carrier frequency and the modulating signal (Digital data) are fed to the FSK modulator which generates output of higher frequencies and lower frequencies with reference to modulating (Digital data) signal. The modulated output signal after amplification and filtering is fed to the track through tuning unit which forms a resonant R-L-C circuit along with connected rails and bonds for the corresponding frequency band. Audio Frequency voltage (AC) is fed to the track and a portion of track thus tuned to a frequency receives maximum power from transmitter. The signal transmitted through the rails is received by the receiver unit. The receiver is tuned to the corresponding frequency through tuning unit. The resonant R-L-C circuit formed by rails, bonds and tuning unit delivers maximum power to the receiver. The output from tuning unit is extended to a relay driver after amplification, filtering and demodulation in the receiver. The output of relay drive operates a 50 volt line relay conforming to BRS 930A or K50 relay when voltage with sufficient amplitude within prescribed frequency range is received.

Section I – Audio Frequency Track Circuit Click for Contents

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The basic carrier frequency for each track circuit in a station shall be different from adjacent track circuit to avoid mutual interference.

Fig.1.4: Block diagram for AFTC 1.10 vkjMh,lvks }kjk vuqeksfnr QesZa RDSO approved firms Following are the RDSO approved firms for the manufacture, supply and installation of AFTC on Indian Railways: (i) For Coded type 1. M/s Alstom Projects India Ltd.., No.63, Trichy Road, Kannamapalayam Post, Coimbatore -641 402. 2. M/s Siemens Ltd., Mobility Division, R&D and Technology Centre, Kalwa Works, Thane-Belapur Road, Airoli Node, Navi Mumbai – 400 708. (ii) For Non-coded type 1. M/s Bombardier Transportation India Ltd., Bombardier House, Race Course Circle, Vadodara – 390 007. 2. M/s Ansaldo STS Transportation Systems India Pvt. Ltd., 35, SLV Complex, AVS Compound, 80 feet Road, Koramangla, IV Block, Bangalore – 560 034.  

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Section II

laLFkkiuk INSTALLATION 2.1 Ikfjp; Introduction In this section, installation guidelines which are common to all types of AFTC have been given. If there is any deviation for AFTC of a particular manufacturer, the same have been given separately in the respective section. 2.2 laLFkkiu gsrq lkekU; vuqns’k General installation guidelines Installation of AFTC is to be done as per installation manual of OEM (Original Equipment Manufacturer) by qualified engineers of OEM or approved agency. Safety tests as specified by the manufacturers like Directionality test for S bonds, Interference test, TSR tests and proper track circuit adjustment should invariably be ensured and recorded before commissioning. Provision of liners and pads under both the rails, proper drainage to avoid water logging in the track, clearance of foot of the rails from ballast etc. are to be ensured. As AFTC is inherently a double rail track circuit, it is recommended that bonding practice should be adopted as per provisions of ACTM for Double Rail track circuits. Tuning zone must not contain check / guard rails, level crossing, catch point / expansion t, TPWS (or AWS) track equipment, impedance bonds, old byed insulated rail ts and structure bond / cross bond. Maximum permissible cable lengths between Transmitter (TX) & its TU (Tuning Unit) and Receiver (Rx) & its TU with 0.9 mm dia. copper conductor of quad cable shall be within specified limits as per the technical and installation manuals of AFTC. TX and Rx of same track circuits should not run in one cable. Receivers of different track circuits having same frequency should not run in one cable. Similarly, Transmitters of different track circuits having same frequency should not run in one cable. Cable compensating resistance, line matching unit, end terminating unit, approved type equi-potential /S / Alpha/ Shunt bond etc. shall be used as applicable. As design of AFTC is specific to make, it would be preferable not to install variety of AFTCs in a section from maintenance point of view. At boundary of AFTC of one make with another make or DC track circuit, specified arrangement as per AFTC’s technical and installation manuals should be provided and continuity of traction return current path should be ensured and strengthened. General guidelines in this regards are given in para 2.3 below.

Section II – Installation

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2.3 ,,QVhlh dh lhek ij VªSD’ku fjVuZ rFkk ØkWflax ckWf.Mx Traction return and crossbonding at termination of AFTC 2.3.1Termination with non-track circuited portion A shunt bond is provided at the termination.

Fig2.1: Termination of AFTC with non-track circuited portion 2.3.2 DC Traction Area (a) Termination with conventional AC Track Circuit A pair of insulation ts and impedance bond at the termination are provided.

Fig.2.2: Termination with conventional AC Track Circuit (b) Termination with AFTC of other manufacturer A pair of insulation ts and back to back alpha bonds at the termination are provided.

Section II – Installation

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Fig.2.3: Termination with AFTC of other manufacturer (c) Return path of sub-station and parallel tracks The traction return path is provided through DC impedance bond of suitable capacity. Connection either to power substation or to parallel tracks is realized through the center tap of impedance bonds.

Fig.2.4: Return path of sub-station and parallel tracks 2.3.3 AC Traction Area (a) Termination with conventional DC Track Circuit A pair of insulation ts are provided at the termination and the traction return path is provided through Terminal bonds shown in Fig. below.:

Fig.2.5: Termination with conventional DC Track Circuit (b) Termination with AFTC of other manufacturer A pair of insulation ts and back to back Alpha bonds are provided.

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Fig.2.6: Termination with AFTC of other manufacturer Note: The traction return path is provided through centre tap of terminal (Alpha) bonds. 2.4 ÝhDoaslh vyksds’ku Iyku rS;kj djuk Preparation of Frequency allocation plan The railway has to prepare frequency allocation plan and installation plans tly with the OEM. The Frequency allocation plan is based on the approved Interlocking Plan (I.P.) and lists out Frequency distribution, Track Circuit name, Track Circuit Length, Bit code (For coded type AFTC) and Electric t layout. AFTCs of different frequencies are to be installed alternatively as per Frequency allocation plan. 2.5 dscy dksj Iyku rS;kj djuk Preparation of Cable Core plan The Cable Core Plan lists out Quad cable distribution from Relay Room to Outdoor equipment. Separate quad cable should be used for Transmitter & Receiver irrespective of main and tail cable. Armours of each quad cable to be earthed at location boxes and at the tuning unit. 2.6 dscyksa dk ifj{k.k Testing of Cables Minimum Insulation resistance between each pair at CT Rack should be more than 10 mega Ohms/Km. Loop resistance of each pair should be recorded and maintained separately. It shall be maximum resistance of 56 Ohm/Km at 20 deg C. 2.7

vkarfjd laLFkkiu Indoor installation Indoor Installation mainly involves erection of main rack and configuration of sub assembly in the main rack.

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     

Fig. 2.7: A typical AFTC indoor wiring plan Erection of Main Equipment rack. Rack Arrangement Plan: It describes AFTC equipment rack arrangement with Track Circuit distribution in each rack. Assembly of Sub-rack in the main rack based on Rack Arrangement Plan. Power Wiring Relay Wiring Earthing & Surge protection

Note: If Tx, Rx and Power Supply units are installed in outdoor location box, then only relay wiring is required in cabin/relay room. 2.8 ckgjh laLFkkiu Outdoor installation Outdoor Installation mainly involves following items       

Laying of Quad cable. Erection of Tuning Units. Laying of electric t and completing the TU to Rail connections. Assembly of Tuning Unit in the Mounting stand Connection between TU and rails. Copper bush to be riveted in the rails before making connection with rails. Cable Wiring. Finally the Tuning to be done in Tuning Units.

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Fig. 2.8: A typical AFTC outdoor plan 2.8.1 Connection of 25 sq. mm copper cable from TU to rail For connecting 25 sq. mm Copper cable to rail web: Drill a hole of 19 sq. in the rail web. Insert 12 mm Hex. Head Bolt. Insert Copper bush and Rivet using Hydraulic tool. Insert 25 Sq.mm Lug for connecting the cable. Tighten with washers and nuts as shown in Fig. below

Fig.2.9: 25 sq. mm copper cable with lug

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Fig 2.10.: Arrangement for connection of 25 sq. mm copper cable to rail

2.8.2 Connection of Electric t to rail For connection of electric t (S-bond, Alpha bond or Shunt bonds) to rail web: Drill a hole of 19 sq. in the rail web. Insert 12 mm Sq.Head Bolt . Insert Copper bush and Rivet using Hydraulic tool. Insert 12 mm Square Head Bolt Tighten with washers and nuts as shown in Fig. below Connect the electric t cable using CAD-weld.

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Fig.2.11: Arrangement for connection of Electric t cable to rail

Fig.2.12: Connection of Electric t cable to rail using CAD-Weld After proper connection, AFTCs should be energized continuously before commissioning. 

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Section III

, chch Vh 1&12 vkWfM;ks fÝDosalh Vªsd lfdZV ABB T1-21 AUDIO FREQUENCY TRACK CIRCUIT 3.1 ifjp; Introduction This system is non-coded type and operates on Frequency Shift Principle where the carrier frequency is shifted between two frequencies close to each other at the rate of modulating frequency (4.8 Hz). The carrier frequency is shifted by + 17 Hz into two frequencies at the rate of 4.8 Hz. Both these frequencies are detected independently and a number of other checks are performed to ensure safety against false operation. This gives a constant output only when both the frequencies are out of phase by 180 degrees. There are eight nominal frequencies (A to H) in the range of 1.5 KHz to 2.6 KHz which are employed to have eight types of track circuits as shown below. Any two types can be used per track and combination of all eight types can be used for quadruple lines. Type A B C D E F G H

Nominal Frequency 1699 Hz 2296 Hz 1996 Hz 2593 Hz 1549 Hz 2146 Hz 1848 Hz 2445 Hz

3.2 eq[; Hkkx Composition The ABB-AFTC consists of Sr. Description Quantity No. 1. Transmitter 1

2.

Tuning Unit

2

3.

End Termination Unit

1

Actual Frequency band Lower Limit Upper Limit 1682 Hz 1716 Hz 2279 Hz 2313 Hz 1979 Hz 2013 Hz 2576 Hz 2610 Hz 1566 Hz 1532 Hz 2163 Hz 2129 Hz 1865 Hz 1831 Hz 2462 Hz 2428 Hz

Description Transmitter is connected to terminals 4 & 5 of TU for normal power mode and 1 & 2 for low power mode (short track circuits of 50 to 250 M) Each TU present offers low impedance to the frequency of adjacent track circuit and prevents its influence In centre fed TC and at the start & end of a section provided with AFTC. Two types of ETU – One with 3 parallel branches of circuits for frequencies A, C, E & G and other with two branches of circuits, for frequencies B, D, F & H

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Sr. No. 4.

Description

Quantity

Description

Receiver

1

5.

Power Supply Unit

2

Receiver is always connected to terminals 1 & 2 of TU A common power supply unit generally feeds two adjacent AF Track circuits.

6.

Output Relay

1

50 V 1350 Ohm, DC neutral relay to BRS :930

Fig. 3.1: Transmitter

Fig. 3.2: Receiver

Fig. 3.3: Power Supply Unit

Fig. 3.4: Track Tuning Unit

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3.3 fÝDosalh ds vkcaVu dh ;kstuk Frequency allocation plan Before installation of AFTC, a frequency allocation plan has to be prepared. In T1-21 type of AFTC there are eight operating frequencies. The allocation of frequencies is done as under: A&B – paired frequencies for first line C&D – paired frequencies for second line E&F – paired frequencies for third line G&H – paired frequencies for fourth line For more than four tracks the above sequence is repeated. There should be minimum separation of two lines, between track circuits of same frequency pair. On a continuously welded track (CWR/LWR), only one pair of the frequency should be used on any track, i.e. A/B, C/D, E/F or G/H. However, where insulated Rail ts are used, any combination of frequencies may be used. 3.4 rdfudh vks Technical data 1.

2.

3. 4. 5. 6. 7. 8. 9. 10 .

11 . 12 .

110 V AC 50 Hz 5-0-95-105-115 V 22.5 to 30.5 VDC 4.4 A (Max.) 3V peak to peak Track Low mode 50-250 meters Circuit Normal mode 200-650 meters length (b) Centre fed 450-1200 meters Minimum ballast resistance 2 Ohm/Km Minimum Train Shunt Resistance 0.5 Ohm (outside tuned area) 0.15 Ohm (inside tuned area) Boundary of track circuit +/- 5 metres (max.) (from centre of tuned area) Length of electrical separation t 18.0 – 22.0 metres Output relay 50 V/1350 Ohm, DC neutral relay to BRS:930 Current consumption of 24 V DC side Transmitter 2.2 A (Max.) Receiver 0.5 A (Max.) Transmitter power output (Max.) Low mode 3W Normal mode 40 W Maximum length of connecting cable (a) Transmitter & feed 30 metres between end tuning unit (b) Receiver & Receiver 350 metres end tuning unit Receiver output 40 – 65 V DC Power Supply Unit

Input (Nominal) Input tappings Output voltage Output current Ripple (a) End fed

Maximum length of cable (19/1.8 Sq. Long cable mm Al.) between the tuning unit and Short cable track.

Section III - ABB T1-21 AFTC

3.25 M 1.45 M

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3.5 dscy fcNkus dh ;kstuk Cabling scheme From cabin/relay room to outdoor location box - Quad cable - 0.9 mm dia From outdoor location box (Tx or Rx) to Tuning Unit – 36/0.3 mm twin copper cable. Lead wires from Tuning Unit to rail - 19/1.8 mm Aluminium cable using stainless steel nuts and bolts of M10 X L40 size and copper tinned lug of 96 sq.mm, M10 round type shall be used. 3.6 laLFkkiu gsrq funsZ’k Installation guidelines AFTC of different frequencies are installed alternatively as per frequency allocation plan. The units of the same frequency may be housed in the same location provided they are fed from separate power supply units. Tx, Rx, Power Supply Unit, Lightning arrestor and Relay should be fixed in a half/Full sized location box near the track as close as possible to the Tuning unit. The tuning unit should be fixed inside ME box, which can be mounted on stakes ed by a concrete foundation as close to rail as possible. All the rails, except those having switch expansion ts and ts inside tuned area, in a track circuited portion shall be longitudinally bonded with the help of two 8 SWG GI wire. For bonding switch expansion ts and ts inside the tuned area 19/1.8 mm Aluminium cable using stainless steel nuts and bolts of M10 X L40 size and copper tinned lug of 96 sq. mm, M10 round type shall be used. Fig.3.5: Installation of Tuning Unit

Fig.3.6: (a) Fixing arrangements (b) Channel pin used for connecting lead wire Power supply unit can be used to supply any combination of Tx and Rx provided its 4.4 Amp. rating is not exceeded and all Tx & Rx frequencies are different. On TU the Receiver is always connected to the terminal 1and 2, and the Transmitter is connected to the terminal 4 and 5. Terminal 3 must be earthed. Section III - ABB T1-21 AFTC

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3.7 ifj{k.k ,oa dk;kZfUor djuk Testing and Commissioning Before commissioning, certain parameters are required to be checked using a special measuring instrument called Frequency Selective Meter (FSM) as shown below:

Fig.3.7: Frequency Selective Test Meter 3.7.1 Transmitter/Receiver Input Voltage/Current Check Tx and Rx input supply voltage and current between terminals B24 and N24 of Tx and Rx. The voltage and current should be as below: Description Transmitter Low mode

Current

Voltage (DC) Mi Max Min. Max. n. . 0.2 0.4 22.5 30.5 A A A A

Normal mode 1.3 A

2.2 A

22.5 A

30.5 A

Fig.3.8: Measurement of Tx input voltage 3.7.2 Transmitter output and Transmitter Tuning Unit Input Voltage Check Tx output voltage at OP1 and OP2 and tuning unit input voltage at terminals 1&2/4&5 for low and normal mode respectively, using frequency selective meter unit. The voltages should be as shown in Fig.3.9. Short Mod terminal with B24 and N24 of transmitter respectively and check upper and lower limits of carrier frequencies which should be as Track circuit frequencies.

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Type

Transmitter

Min. 10 V AC

Max. 11 V AC

Tx. Tuning Unit Input Voltage Min. Max. 08 V 11 V AC AC

15 V AC

16 V AC

13 V AC

Output Voltage

A,C, E &G

B,D,F&H

16 V AC Fig.3.9: Measurement of Tx output voltage

3.7.3 Transmitter and Receiver end Rail Voltage Check the Tx and Rx end rail voltage at terminals T1 and T2 of the respective tuning unit, by using frequency selective meter unit. Voltage should be as below: Type of equipment A,C,E &G Max. Min.

Description Min. Transmitter Low mode Normal mode Receiver Low mode Normal mode

B,D,E &H Max.

0.8 V AC 4.5 V AC

1.7 V AC 5.3 V AC

0.8 V AC 5.8 V AC

1.7 V AC 6.6 V AC

0.5 V AC 0.4 V AC

0.9 V AC 1.6 V AC

0.5 V AC 0.4 V AC

0.9 V AC 1.6 V AC

3.7.4 Transmitter/Receiver end Rail Voltage at companion tuning units Check Tx and Rx end companion tuning unit voltages at terminals T1 and T2, using frequency selective meter unit. AC voltage should be as below:

Description Transmitter Low mode Normal mode Receiver Low mode Normal mode

Type of equipment A,C,E &G Min. Max.

B,D,E &H Min.

Max.

70 mV 375 mV

140 mV 440 mV

0.8 V AC 5.8 V AC

1.7 V AC 6.6 V AC

40 mV 30 mV

75 mV 130 mV

25 mV 20 mV

50 mV 90 mV

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 3.7.5 Receiver input current from Tuning Unit Measure the voltage across 1 ohm resistor connected in series with input of Rx. Fig.3.10: Measurement of Rx input current from TU

3.7.6 Receiver output relay voltage Specified range 40 V to 65 V DC when relay is connected 120 V DC when relay is disconnected 3.8 ,,QVhlh midj.kks dk lek;kstu Adjustment of AFTC equipment After ensuring that the equipment has been installed and connected properly, set the power supply input tapping to match the 110 V AC and adjust the receiver gain as below: 3.8.1 Receiver gain table Track Circuit length (in metres) Normal mode Low mode Min. --200 240 300 360 415 475 535 595 655 710 770

Max. --240 300 360 415 475 535 595 655 710 770 1000

Min. ---50 90 110 140 170 200 230 ----

Max. ---90 110 140 170 200 230 250 ----

Input wiring & Pick up current Pick up Inputs Loop current 1 2 1 195 mA 1H 1L 98 mA 1L 3L 1H-3H 65 mA 3H 3L 49 mA 1H 3I 1L-3H 39 mA 1L 9L 1H-3L 33 mA 3L 9L 3H-9H 28 mA 1H 9L 1L-3L 24 mA 1L 9L 1H-9H 22 mA 9H 9L 20 mA 1H 9L 1L-9H 18 mA 1L 9L 1H-3H 16 mA 3H 9L 3L-9H 15 mA 1H 9L 1L-3H

Loop 2

3H-9H 3H-9H

3L-9H 3L-9H

3.8.2 Procedure (i) Put Tx on Normal mode Make proper communication arrangements between both ends. Connect 1 ohm Train Shunt Resistance (TSR) across rails at receiver end Tuning Unit (TU) and gradually go on reducing the gain till the relay drops. Section III - ABB T1-21 AFTC

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Gain

1 2 3 4 5 6 7 8 9 10 11 12 13

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Now increase the TSR to 1.1 Ohm, the relay should normally pickup. If it does not, then repeat the process with a TSR 1.2 and 1.3 Ohms. If the relay is still de-energised, increase the gain. Relay should now pick up. Reduce the TSR in steps of 0.1 Ohms. The relay must definitely drop out for TSR greater than or equal to 0.8 Ohms. (ii) Put Tx on Low mode Connect 1.5 Ohm TSR across Rails at Rx End Tuning Unit connections. Go on reducing the gain setting unless the relay drops. Now increase the TSR to 1.6 Ohm, the relay should pick up. If the relay does not pickup, repeat step 1 & 2 for TSR of 1.7 Ohms and 1.8 Ohms. Increase the gain if relay is still de-energised, now the relay should pick up. Reduce the TSR in steps of 0.1 Ohm. The relay should definitely drop out for TSR greater than or equal to 1.3 Ohm. 3.9 vuqj{k.k rFkk fujh{k.k Maintenance & Inspections (i) Fortnightly Ensure that the “Singing Noise” produced by the equipment is present. Measure the power supply output voltage and current. Measure the Transmitter output voltage. Measure the Reciever input current, if any adjustment is needed same shall be done as per para Measure the relay voltage. Inspect the track circuit connection with the rails and interconnections between power supply units, Tx, TUs, Rx and relay. Ensure that these are in order. Conduct shunt drop test with TSR of 0.5 Ohm outside the tuned area and 0.15 Ohm inside the tuned area. Note: Switch OFF the companion Tx sharing the tuned area under test, by removing fuse while measuring current/voltage of the equipment. (ii) Quarterly Check all nuts and bolts of tuning unit terminals and rail connection and ensure that these are fully tight. Check rail bonds. Check the lightning arrestor and its connection. Check the earthing of the equipment. Check the Transmitter upper and lower carrier frequencies. 3.10 =qfV ds y{k.k rFkk fuokj.k Fault diagnosis and rectification On failing both ading track circuits together, check power supplies, TU or interconnections. Always start checking from Tx end. Before starting a test, check TU to rail and impedance bond to rail connections.

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(i) Transmitter end Check “Singing noise” produced by Tx and TU. If it is available then check Rail to Rail voltage at Tx end. Connect a 0.5 Ohm TSR across the feed end TU rail connections. If rail to rail voltage is reduced by 50% (approx.) then Tx end is OK. Check 24 V DC power supply and current to Tx and the Transmitter output voltage. If reading shows deviation from normal limit, the power supply unit, Tx or TU may be faulty. For integrity of interconnections, check I/P and O/P voltage of TU. If rail to rail voltage is not within normal limits, either TU or the rail connections may be faulty. If the Companion TU voltage is not within normal limit, Companion TU is faulty. In that case when T1 and T2 terminals of companion TU are shorted, the rail to rail voltage at the TU of the failed track circuit becomes OK. If Tx side is OK, patrol along the track checking bonds and insulation pads and metal burrs etc. (ii) Receiver end If voltage at Rx TU unit rail connections is low, either TU or connection has failed. If voltage at Companion TU is not within limit, it will be faulty. In that case if the rail to rail voltage at the TU of failed track circuit becomes OK when T1 and T2 terminals of Companion TU are shorted. If Rx input current is very less than operation current (15 mA), then the Rx TU is faulty. If Rx O/P is very less with a good power supply, change Rx. Check relay connections and the voltage on coil terminals, if not adequate change the relay. 3.11 vko';d vkStkj @ midj.k Tools/Equipments required Frequency Selective Meter Unit (FSMU) Multi Meter (Capacity -10 Amp.) Frequency Meter (0.1 Hz – 10 KHz) Shunt Resistance Box (0-2 Ohm in steps of 0.1 Ohm) Box and Flat Spanners of different size (M5, M8 & M10) Screw driver. Crimping tool



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Section IV

lhesal ,QVhth ,l fjeksV QsM dksMsM vkWfM;ks fÝDosalh Vªsd lfdZV SIEMENS FTG-S REMOTE- FED, CODED AUDIO FREQUENCY TRACK CIRCUIT 4.1 ifjp; Introduction FTGS is a remote fed AFTC with a frequency modulated AC voltage in which data is coded into bits of odd and even streams. Audio frequency modulated (AC Voltage) and coded signals generated by the transmitter card are fed to the feed end track through a tuning unit and received at the receiver end tuning unit through rails. From receiver end T.U. the signals are sent to the receiver card provided in the cabin through telecom cables. Here the signals are demodulated and evaluated in two separate channels for redundancy. If the codes of received signal match with the preset code, two track relays, connected at the end of the channels in relay card (GF1, GF2) pick up. When the transmitted signal voltages get shunted through the vehicle axle, the two track relays (GF1,GF2) drop. Various LED indications are provided on each card to facilitate failure detection. Various testing voltage can be measured at measuring sockets.

Fig.4.1: Schematic diagram for Siemens FTG –S AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 4.2

oxhZdj.k Classification There are two types of track circuits with twelve operating frequencies and 15 bit patterns, to be provided within station limits and for outside the station limits. FTG-S 917 It is for shorter track circuits within station limits. Operates on frequencies 9.5 kHz to 16.5 kHz. i.e. total 8 frequencies with a difference of 1 kHz between consecutive frequencies. These have following variants: (i) Standard (ST)(65VA) (a) End fed (b) Straight line application (c) Lengths up to 350 m. (ii) Central feed-in (M) (75VA) (iii) Points (W) (75VA) - For Point zone with one turn out (iv) Crossing (KR) (85VA) - For Point zone with two turn out or crossing track circuit Operating frequencies are f1= 9.5 KHz, f2=10.5 KHz, f3=11.5 KHz, f4=12.5 KHz, f5=13.5 KHz., f6=14.5 KHz, f7=15.5 KHz, f8=16.5 KHz. FTG-S 46 These are provided for longer track circuits outside station limits. Operate on frequencies 4.75 to 6.25 kHz i.e. total 4 frequencies with a difference of 0.5 kHz between them. These have following variants: (i) Standard Configuration (ST) (80VA) (a) End fed (b) Straight line application (c) Lengths 350 m to 550 m (ii) Central feed-in (M) (90VA) (a) Centre fed (b) Straight line application (c) Lengths 550 m to 1000 m Operating frequencies are f9 = 4.75 KHz., f10=5.25 KHz, f11=5.75 KHz, f12=6.25 KHz. Adjacent sections and sections in parallel tracks are operated with different frequencies to prevent interaction.

4.3 rdfudh vks Technical data Minimum Ballast Resistance - 1.5 ohms/km (ideal is 2.5 ohms/Km) Maximum recommended TSR - 0.5 ohms (other than the tuned zone) Power Supply -(i) 230V AC + 10% -15%, 50Hz. + 2% Power Consumption: FTGS - 46 (i) Standard Configuration (ST) - 80VA (ii) Central feed-in (M) - 90VA

Section IV – Siemens FTG S AFTC

FTGS - 917 (i) Standard (ST) - 65VA (ii) Central feed-in (M) - 75VA (iii) Points (W) - 75VA (iv) Crossing (KR) - 85VA

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Minimum effective length of Track circuit - 30 M. Maximum effective length as per table below Table I Effective ranges for FTG S 917 Remote feeding 4.5 Km 4.5 Km 6.5 Km FTG S 46 Remote feeding 6.5 Km

Ps

RB=1.5 Ohm X Km St 917 M 917

<= 1.0 Ohm <=0.5 Ohm <= 0.5 Ohm Ps

300 M 350 M 300 M ST 46

750 M 850 M 700 M M 46

<= 0.5 Ohm

600 M

1200 M

Ps = Permissible Train Shunt RB = Specific Ballast Resistance W/K = Layout for Points and Crossings

W/K 917 YES

RB= 2.5 Ohm X Km St 917 M 917 350 M 400 M 330 M ST 46

950 M 1000 M 850 M M 46

750 M

1500 M

St = Standard Layout M = Centre-fed Layout

4.4 iz.kkyh dh jpuk System composition System consists of indoor equipment and outdoor equipment 4.4.1 Indoor Equipment It consists of two units - Evaluator and Power Supply Unit. (a) Evaluator This consists of a number of PCBs provided in one PCB frame mounted in a rack. In one rack, upto 10 FTG-S track circuit evaluators can be installed. Each evaluator is provided with a separate power supply unit. Front plate of the PCBs is equipped with LEDs for indication of operational data and easy diagnosis of failures. Measuring sockets are provided on each card to take readings and rectify the failures quickly. Types of evaluator FTG S 917 ST Evaluator FTG S 46 ST Evaluator FTG S 917 W Evaluator (For Point zone with one turn out) FTG S 917 KR Evaluator (For Point zone with two turn out or crossing track circuit) FTG S 46 M

Fig.4.2: FTG S 917 ST Evaluator Section IV – Siemens FTG S AFTC

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Fig.4.3: FTG S 46 ST Evaluator Evaluator consists of following plug-in type PCBs Frequency dependant cards (i) Amplifier and filter Card (No. S25533-B40 for FTGS 917) Filter Card (No. S25533 –B42 for FTGS 46)

Fig.4.4: Amplifier & Filter card Due to the Frequency Filter in these cards, each frequency equipment has its own filter cards.

(ii) Receiver I Card (S25533-B33)

(i) Due to the multi-step input filters in this card, each frequency requires its own special card. (ii) Each receiver section has its own set of I L5, II L5, I L6 and II L6 LEDs. Fig.4.5: Receiver I Card

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Universal Cards (i) Transmitter Card (No.S25533-B30) This card can be used for any frequency/ bit pattern just by changing the frequency coding plug (chip) Fig.4.6: Transmitter card

(ii) Demodulator Card (No. S25533 -B35)

v) Relay card (Card No. B36 A4)

Fig.4.7: Demodulator Card This card can be used for any frequency/bit patterns by changing the two nos. of bit pattern coding plug (chips) on this card. LEDs I L7 and II L7 of the receiver-2 board S25533-B39-A3 only light up if all L5 and L6 LEDs of all associated receiver I and demodulator boards for channels I and II are also on.

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 (iii) Amplifier Card (No. S 25533-B41 for FTGS 46) This card can be used for all the frequencies of FTGS 46 type Track Circuits.

(iv) Relay Card (No.S25533-B36) The relay board has a two-channel structure. Both channels are identical and each has a K50b metal to metal (2NC/2NO) signalling relay as an output relay. It has a pick up time of 600 milli sec and drop away time of 250 milli sec. (v) Receiver II Card (Card No. B-39A for straight track) Two types of cards Receiver cards are available: No.S25533-B39 – Used for Standard (ST) configuration Track Circuits of any Frequency/Bit pattern. No. S25533 – B34 – Used for Point configuration (having Rx1, Rx2) and Centre Fed (M/W/KR) Track circuits of any Frequency/Bit pattern.

Fig.4.8: Receiver II Card (vi) Coding board The coding board S25533-B38-A1-*-4400 is required to program the mounting frames FTG S 917 W (S25533-C10-A2-*-4400) FTG S 46 M (S25533-C14-A3-*-4400). This board contains jumpers only. When using the mounting frames S25533-C10-A2-*- 4400 as a point track circuit or centre-fed track circuit, one coding board is required. When using the mounting frames S25533-C10-A2-*- 4400 as a standard track circuit, a second coding board is required. When using the mounting frames S25533-C14-A2 or –A3 -*- 4400 as a standard track circuit, one coding board is required.

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(vii) Dummy Board Dependent on the board arrangement, not all the slots in the mounting frames are equipped with boards. Dummy boards must be used in these gaps as protection against accidental . (b) Power supply Unit Each track circuit has its own power supply unit behind the associated mounting frame at the rear of the rack. Input voltage = 110V AC or 220 V AC Output voltage = + 5V DC, + 12 V DC

Measuring sockets

Fig 4.9: Power Supply Unit Front view 4.4.2 dscy fcNkus gsrq ;kstuk Outdoor Equipment Tuning units in track connection boxes - 2 Nos. Trackside connection box cables. - for connecting TU to rail. Rail bonds S-bonds, Shunt bonds, Termination bonds (Alpha bonds) 4.5 dscy fcNkus gsrq ;kstuk Cabling scheme From cabin to Tuning Unit – Star quad cable of 0.9 mm core diameter From Tuning Unit to rails - Copper ropes of diameter 25 sq mm Rail bonds (S, Alpha or Shunt) – 16 mm dia steel wire ropes 4.6 VªSd ls la;kstu Track side connections Transmitter TU Cable from Relay room is connected to terminals 11&14. Track lead wires to rail is connected to terminals 9 & 10. Receiver TU Track lead wires from rail is connected to terminals 9 & 10. Cable to relay room is connected to terminals 15 & 20. Section IV – Siemens FTG S AFTC

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Fig.4.10: TX & Rx Tuning Units in a trackside connection box and termination

Fig. 4.11: Electrical separation t with S-bond and actual connections at site Section IV – Siemens FTG S AFTC

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4.7 fÝDosalh o MkVk dksfMax dk vkcaVu Frequency and data coding allocation For adjacent track circuit, same frequency or the very next frequency should not be allotted. There should be a separation of at least one frequency with the exception of F8 and F9 since separation between these two frequencies is more. If same frequency is repeated anywhere in the same yard/centralized place then ‘data’ must be different for the other track circuit. Restrictions Frequency plan for more than two parallel tracks require interlacing of FTGS – 46 and FTGS – 917 AFTCs. FTGS-917 has limitation of 1 Km for remote feed against 2.9 Km for FTGS - 46 with 0.9 mm dia. copper conductor. For FTGS-917 to work for longer distance, 1.4 mm dia. copper conductor is required. AFTC in point zone requires insulation rail ts. FTGS-46 configuration cannot be used in point zone. FTGS -917 is permitted for point track circuit with two receivers. 4.8

fÝDosalh rFkk fcV iSVuZ ¼MkVk½ dksfMax Iyx Frequency and bit pattern (Data) coding plugs Different frequency and bit pattern coding plugs are available to select the frequency and data in the transmitter card and also select the reference data signal in the demodulator card.

4.8.1Frequency coding plugs for Transmitter board only The transmitter board must be set to the defined frequency using a plug in accordance with S25533-A30-A1 to A12 -*- 4400 as given below: Table II Variant Frequency Coding plug FTG-S 917 9.5 kHz S25533 – A30 –A1 - * - 4400 10.5 kHz S25533 – A30 –A2 - * - 4400 11.5 kHz S25533 – A30 –A3 - * - 4400 12.5 kHz S25533 – A30 –A4 - * - 4400 13.5 kHz S25533 – A30 –A5 - * - 4400 14.5 kHz S25533 – A30 –A6 - * - 4400 15.5 kHz S25533 – A30 –A7 - * - 4400 16.5 kHz S25533 – A30 –A8 - * - 4400 FTG –S 46 4.75 kHz S25533 – A30 –A9 - * - 4400 5.25 kHz S25533 – A30 –A10 - * - 4400 5.75 kHz S25533 – A30 –A11- * - 4400 6.25 kHz S25533 – A30 –A12- * - 4400 4.8.2 Bit pattern coding plug for Transmitter board and Demodulator board only The predefined bit pattern must be set on the transmitter board using further plug in accordance with S25533-A30-A22 to A40 -*- 4400. The associated demodulator boards must each be equipped with two of the same plugs in accordance with S25533-A30A22 to A40 -*- 4400 as given below Section IV – Siemens FTG S AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Table III Bit pattern 2.2 2.3 2.4 2.5 2.6 3.2 3.3 3.4

Coding plug S25533 – A30 – A22- * - 4400 S25533 – A30 – A23- * - 4400 S25533 – A30 – A24- * - 4400 S25533 – A30 – A25- * - 4400 S25533 – A30 – A26- * - 4400 S25533 – A30 – A28- * - 4400 S25533 – A30 – A29- * - 4400 S25533 – A30 – A30- * - 4400

Bit pattern 3.5 4.2 4.3 4.4 5.2 5.3 6.2

Coding plug S25533 – A30 – A31- * - 4400 S25533 – A30 – A33- * - 4400 S25533 – A30 – A34- * - 4400 S25533 – A30 – A35- * - 4400 S25533 – A30 – A37- * - 4400 S25533 – A30 – A38- * - 4400 S25533 – A30 – A40- * - 4400

4.9 iSjkehVj ntZ djuk Recording of parameters The following readings should be taken during periodical maintenance (a) Power Supply Unit Input to PSU – AC Volts (110 V AC + 15% ) Output of PSU – DC Volts (12 V DC + 1 V) DC Volts (5 V DC + 0.5 V) (b) Readings at Tx end Frequency of AFTC – ……………KHz Input to Tuning Unit (Terminal No. 11 & 14) ……Volts AC (Audio Frequency Voltage) Output of Tuning Unit (Terminal No. 9 & 10) ……Volts AC Voltage across the rails……Volts AC (c) Readings at Rx end Voltage across the rails……Volts AC Input to Tuning Unit (Terminal No. 9 & 10) ……Volts AC (Audio Frequency Voltage) Output of Tuning Unit (Terminal No. 15 & 20) ……Volts AC. (d) Readings at Evaluator For troubleshooting the voltage readings at the power unit and measuring sockets provided on the evaluator can be taken. The permitted values are given in the table on next page. 4.10 vuqj{k.k Maintenance The boards of remote-fed audio frequency coded track circuits do not require any maintenance, because they do not have any moving parts with wear and tear.  The reliable operation can be ensured by observing precautions and check points as given in Section VII. 4.10.1 Testing voltages at measuring sockets For troubleshooting purposes, the voltages at the power unit and measuring sockets of the major components can be measured. The permitted values are given in the table below: Section IV – Siemens FTG S AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Table IV Sr. No.

Card No.

Description

Socket No.

Adjuster range

1.

B40/B41

Amplifier Input (Transmitter output)

1&2

20V AC

2.

B33

I-8 & II-8

20 V DC

3.

B41

12 V Supply voltage Amplifier Output

3.1 & 4.1

200 V AC

4.

B40/B42

Filter Card

3&4

200 V AC

5.

B30 A2

Tx Card

LEDs

6.

B33

Rx I Input

7.

B33

Rx I CH II II-5 & II- 20V AC Input 8

8.

B33

9.

B33

10.

B33

11.

B33

12.

B33

13.

B33

14.

B39/34

15.

B39/34

Rx I CH I Input Rx I CH II Input Rx I CH I Output Rx I CH II Output Demodulator Input CH I Demodulator Input CH II Relay Voltage CH I Relay Voltage CH II

--

CH I I-5 & II-8

I-5 & II-8

20V AC

20V AC

II-5 & II- 20V AC 8 I-6 & II-8 20V DC II-6 & II8 I-7 & II8 I-7 & II8 I-11 & I12 II-11 & II-12

20V DC 20/2 V AC 20/2 V AC 20 V DC 20 V DC

Section IV – Siemens FTG S AFTC

Permitted range

Actual reading (Sample data) 9 V to 12 (11.36 V AC V)

11 V to 13 (12.3 V) V DC 60 V to 90 (64.9 V) V AC

30 V to (73.3 V) 100 V AC

--

(L2 L3)

> 6.5 V AC (9 V ) to < 20 V AC > 6.5 V AC (9 V ) to < 20 V AC < 5 V AC (2.16 V ) < 5 V AC

(2.6 V)

12 V to 15 V DC 12 V to 15 V DC 1.3 V to 2 V AC 1.3 V to 2 V AC 16.5 + 1 V DC 16.5 + 1 V DC

(14.16 V) (14.24 V) (1.73 V)

Remarks

Square wave voltage approx.18V T=1/10= 69 to 210 us

Square wave voltage approx.100 to 150V with peaks To track (before cable stabilizing resistor) Observe Flickering Frequency Code With track clear With clear

With track occupied With track occupied

(1.8 V) (15.7 V) (15.7 V)

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4.11 Standard looping and gain setting Voltage adjustment in Rx1 card Standard input to Rx I card is 0.3 V to 2 V AC. To achieve this, following looping is done in Rx unit: 3 -11 & 4 -13 – Low voltage 3 -12 & 4 - 13 – Medium voltage (Normal adjustment) 3 -11 & 4 - 12 – High voltage No voltage adjustment to be done in Transmitter T.U. Standard looping in Tuning unit Table V Type Looping FTGS 917 Tx 2 - 8, 7 – 8 FTGS 917 Tx (without bond) Remove loop 7- 8, Remove GREY wire from terminal 9 and connect it to terminal 7 FTGS 917 Rx 2 - 8, 6 - 7, 3 - 11, 4 - 13 FTGS 917 Rx (without bond) Remove loop 6 - 7, Remove GREY wire from terminal 9 and connect it to terminal 7. FTGS 46 Tx No looping FTGS 46 Rx 3-11, 4-13 FTGS 46 Rx Remove loop 7-9, Remove GREY wire from terminal 9 (without bond) (Centre fed) and connect it to terminal 7 Gain setting through DIP switches in RX1 card For gain setting, DIP switches are provided in the card numbered from 1 to 10. The following are the combinations of DIP switches to achieve different gain settings: 1 ON ON ON ON ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF

2 OFF OFF OFF OFF OFF ON OFF ON OFF ON OFF ON OFF ON OFF

3 4 5 6 7 8 9 10 OFF OFF OFF OFF OFF OFF OFF ON Highest Gain OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF OFF ON Normal Gain ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF ON OFF OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF ON OFF OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF OFF OFF OFF ON OFF OFF OFF OFF ON OFF OFF ON OFF OFF OFF OFF Lowest Gain Fig. 4.12: Gain setting through DIP switches in RX1 card

Section IV – Siemens FTG S AFTC

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4.12 vkStkj o ekius ds midj.k Tools and measuring equipment Outdoor equipment Frequency Selective Multimeter (Rishab 18S or similar) Resistor module (S25533 –A5 –A1 – contains 0.5 Ohm and 1 Ohm resistors for axle shunt simulation). Tuning module (S25533-A31-A1) 2 rail clamps (C25211 – A76-B3) Open-end, ring or box spanner, width across flats 13 mm. 3 mm. Allen key 3 mm screwdriver 3.5 X 0.5 mm. screwdriver (A2V00001156483) for WAGO terminals. Indoor equipment Frequency Selective Multimeter (Rishab 18S or similar) Adapter board (S25533 – B50 –A1) Potentiometer module (C25107 – A109 –A3) 1.5 mm screwdriver.  

Section IV – Siemens FTG S AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Fault diagnosis/LED indicator combinations ○ – LED OFF

Table VI Sr. Power No. Unit

Transmitter (B30)

● – LED ON/Flickering

Ampli- Ampli fier -fier B41 Filter B40B42 12V 5V L1 L2 L3 L8 L9 L4.1 L4

Receiver DemoI B33 dulator B35

Receiver Relay II B39module B34 B36

II L5 ●

I L6 ●

II L6 ●

I L7 ●

II GF1 GF2 L7 UP ● UP

1

○

○

●

●

●

●

●

●

●

I L5 ●

2

○

○

●

●

●

●

●

●

●

○

○

○

○

○

○

DN

DN

3

○

○

●

●

●

●

●

○

○

○

○

○

○

○

○

DN

DN

4

○

○

○

○

○

○

○

○

○

○

○

○

○

○

○

DN

DN

5 6 7 8

● ○ ○ ○

○ ○ ● ○

○ ○ ○ ○

● ○ ○ ●

● ○ ○ ●

● ○ ○ ●

○ ○ ● ●

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

○ ○ ○ ○

DN DN DN DN

DN DN DN DN

9

○

○

●

○

●

●

●

●

●

●

○

○

○

○

○

DN

DN

10

○

○

●

●

○

●

●

●

●

●

●

○

○

○

○

DN

DN

Section IV – Siemens FTG S AFTC

Maintenance action required/Remarks

Section is clear (No action required) Section is occupied or see no.12 Replace Amplifier Filter Module FTGS 917 (B40) or FTGS 46 (B41) Check voltages 110 V AC, 12 V DC, 5 v DC; if OK Replace Transmitter Module (B30) Check 12 V DC voltage Check 110 V AC Fuse Check 5 V DC voltage Replace Transmitter Module (B30) Replace Transmitter Module (B30) Replace Transmitter

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Sr. Power No. Unit

Transmitter (B30)

Ampli- Ampli fier -fier B41 Filter B40B42 12V 5V L1 L2 L3 L8 L9 L4.1 L4

Receiver DemoI B33 dulator B35

Receiver Relay II B39module B34 B36

I L5

II L5

I L6

II L6

I L7

II GF1 GF2 L7

11

○

○

●

●

●

●

●

●

○

○

○

○

○

○

○

DN

DN

12

○

○

●

●

●

●

●

●

●

○

○

○

○

○

○

DN

DN

13

○

○

●

●

●

●

●

●

●

●

○

●

○

●

○

UP

DN

14

○

○

●

●

●

●

●

●

●

○

●

○

●

○

●

DN

UP

Section IV – Siemens FTG S AFTC

Maintenance action required/Remarks

Module (B30) Replace Amplifier Filter Module FTGS 917 (B40) or FTGS 46 (B42). If fault persists, replace Transmitter Module (B30) as well Check voltage between measuring sockets I 5 & II 8 on Receiver –I Module (B33); If Voltage < Permitted Value: Check Voltage between measuring sockets 3 & 4 on Amplifier Filter Module (B40) and outdoor equipment. If Voltage >= Permitted value : Replace Receiver –I Module (B33) Replace Receiver - I Module (B33) Replace Receiver - I

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Sr. Power No. Unit

Transmitter (B30)

Ampli- Ampli fier -fier B41 Filter B40B42 12V 5V L1 L2 L3 L8 L9 L4.1 L4

Receiver DemoI B33 dulator B35

Receiver Relay II B39module B34 B36

I L5

II L5

I L6

II L6

I L7

II GF1 GF2 L7

15

○

○

●

●

●

●

●

●

●

●

●

●

○

●

○

UP

DN

16

○

○

●

●

●

●

●

●

●

●

●

○

●

○

●

DN

UP

17

○

○

●

●

●

●

●

●

●

●

●

○

○

○

○

DN

DN

18

○

○

●

●

●

○

●

●

●

●

●

●

●

○

○

DN

DN

19 20 21

○ ○ ○

○ ○ ○

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

● ● ●

○ ○ ●

○ ● ○

DN DN UP

DN UP DN

Section IV – Siemens FTG S AFTC

Maintenance action required/Remarks

Module (B33) Replace Demodulator Module (B35) Replace Demodulator Module (B35) Replace Demodulator Module (B35) Replace Transmitter Module (B30); Scanning pulse is faulty. Connect Measuring sockets E1 & E2 on Receiver – I Module (B33): If LEDs I L6 and II L6 on the Demodulator Module (B35) do not switch OFF, Replace Demodulator Module (B35). If LEDs I L6 and II L6 on the Demodulator Module (B35) switch OFF, Replace Receiver

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Sr. Power No. Unit

Transmitter (B30)

Ampli- Ampli fier -fier B41 Filter B40B42 12V 5V L1 L2 L3 L8 L9 L4.1 L4

Receiver DemoI B33 dulator B35

Receiver Relay II B39module B34 B36

I L5

I L7

II L5

I L6

II L6

II GF1 GF2 L7

22

○

○

●

●

●

●

●

●

●

●

●

●

●

●

●

DN

DN

23

○

○

●

●

●

●

●

●

●

●

●

●

●

●

●

DN

UP

24

○

○

●

●

●

●

●

●

●

●

●

●

●

●

●

UP

DN

○ – LED OFF

Maintenance action required/Remarks

Module (B39 for Point zone track circuit or B34 for straight track circuit). Note: Preceeding track circuit in a cascade must be clear. Replace Relay Module (B36) Replace Relay Module (B36) Replace Relay Module (B36)

● – LED ON/Flickering

Section IV – Siemens FTG S AFTC

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Section V

vYLVkWe fMft dksM vkWfM;ks fÝDosalh Vªsd lfdZV ALSTOM DIGI CODE AUDIO FREQUENCY TRACK CIRCUIT 5.1 ifjp; Introduction The Alstom DIGICODE is a remote-fed, t-less and coded Audio Frequency track circuit. It can feed upto a maximum distance of 3.5 Km. It is designed as a track vacancy detection system for railways (mainline and stations), underground, urban and suburban railways. The system is modular in design and equipped with a diagnostic board indicating the characteristic voltages and currents. In Digi Coded AFTC system the Minimum Shift Keying (MSK) technique is used. A train or vehicle is detected by feeding audio frequency signals with a specific protection codes in the track.

Fig. 5.1: Block Diagram of DIGICODE AFTC 5.2 oxhZdj.k Classification DIGICODE is available in two versions namely DTC 24 and DTC 921. DTC 24 It is used for longer track circuits on main line. It can cater for track circuits length from 100 mtr. to 700 mtr. in case of end-fed configuration and upto 1000 mtr. in case of centre-fed configuration. DTC 24 has following variants:

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 DTC 24 (LF) – End fed. DTC 24 (LF) – Center fed. DTC 921 It is used for short length track circuits on main line, points and crossings. It can cater track circuits length from 30 mtr. to 400 mtr. DTC 921 has following variants: DTC 921 (HF) – End fed. DTC 921 (HF) – 2 Receiver (Point zone) DTC 921 (HF) – 3 Receiver (Point zone) Operating frequencies and code allocation Table I - DTC 24 S. No. 1 2 3 4 5 6

Carrier Frequency name F1 F2 F3 F4 F5 F6

Frequency (Hz)

Allowed Codes

2100 2500 2900 3300 3700 4100

C1,C2,C3 C4,C5,C6 C7,C8,C9 C10,C11,C12 C13,C14,C15 C16,C17,C18

Table II - DTC 921 S. No 1 2 3 4 5 6 7 8

Carrier Frequency name F7 F8 F9 F10 F11 F12 F13 F14

Frequency (Hz) 9500 11100 12700 14300 15900 17500 19100 20700

Allowed codes C19,C20,C21 C22,C23,C24 C25,C26,C27 C28,C29,C30 C31,C32,C33 C34,C35,C36 C37,C38,C39 C40,C41,C42

5.3 iz.kkyh dh jpuk System description 5.3.1 Indoor equipment (a) Evaluator Evaluators are placed in a rack which is either an open rack or a closed cubical. An open rack contains upto 3 sub-racks. Each sub-rack contains 2 DIGICODE evaluators hence overall each open rack can accommodate upto 6 DIGCODE evaluators. Open rack also contains relay bracket at the top to accommodate track relays. Alternatively, 6 end fed track circuits or 3 center fed track circuits or 6 point zone track circuits can be installed in one open rack.

Section V – Alstom DigiCode AFTC

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Similarly, a closed cubical rack contains upto 5 sub-racks. Each sub-rack contains 2 DIGICODE evaluators hence overall each rack can accommodate upto 10 DIGCODE evaluators The Evaluator consists of following modules  Tx-Rx Module  RT Module (Train detection module)  Modem board  Point Rx board (For point zone track circuits)  Diagnostic board (Optional)

Fig. 5.2: DIGICODE Evaluator front view (b) Power Supply Unit Input 230 V AC + 10% 50 Hz + 2% or 110 V AC + 10% 50 Hz + 2%

POWER CONV.-1

POWER CONV.-2

Fig.5.3: DIGICODE Evaluator rear view (c)Lightning Discharger Lightning Discharger (LD) is connected in between the AFTC indoor equipment & Field cables. It is provided to safe guard the AFTC equipment from high voltage emerging from Lightning. It is a class D type.

Section V – Alstom DigiCode AFTC

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(d) Constant Voltage Transformer It has been recommended in areas where power fluctuations are more than 10%.It is a Ferro resonant type CVT. One CVT(1000W) can cater for 6 Nos of End Fed or 3 Nos of Center Fed or 6 Nos of Point Zone Track circuit. 5.3.2 Outdoor equipment Tuning units Bonds for separation of two adjacent AFTCs -S-bonds, Alpha-bonds or Shunt bonds

Fig. 5.4: DIGICODE Tuning Unit connections Tuning Unit connections: CN3 – Always to lower frequency CN4 – Always to higher frequency

A – Always to lower frequency B – Always to Centre of bond C – Always to higher frequency

5.4 dscy fcNkus gsrq ;kstuk Cabling scheme Power wiring (indoor) – 6 Sq.mm.Multi-strand wire The connection between the Tuning Unit (TU) and Processing Unit is provided through one pair of 0.9 mm dia quad cable – single conductor upto 1 Km distance and double conductors are used beyond 1 Km. Tuning Unit to rail connection – 25 Sq. mm. Copper cable. Electric t S-bond, Alpha bond or Shunt bonds - 145 Sq.mm Galvanized Steel cable 5.5 rdfudh vks Technical data Table III S. DTC 24 Characteristics No. (Main Line) 1 Maximum TC Length 700m-EF,1000m-CF 2 Minimum TC Length 100m 3 Electric t Length 18.6 to 25.4m 4 Ballast Resistance 2 ohm/Km 5 Carrier Frequency Range 2.1KHz-4.1KHz 6 No.of Channels 6 0.5 ohm & 0.15 ohm 7 Track Shunt Resistance for tuned zone

Section V – Alstom DigiCode AFTC

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DTC 921 (Station/ Transit) 400m-EF 30m 6m 2 ohm/Km 9.5KHz-20.7KHz 8 0.5 ohm & 0.15 ohm for tuned zone

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 8

Power Consumption

9

Input Power

50-140 VA(EF),50200VA(CF) 110V±10%, 50 Hz ±2%

50-140VA(EF) 110V±10%, 50 Hz ±2%

5.6 fMft dksM ds dkMksZ dh tkudkjh Cards information 5.6.1. For straight track circuits (i)Frequency dependent cards 1. Tx & Rx Module – there are 6 types from F1 to F6 2. Tuning Unit – There are 6 types of TU Boards e.g. F1/F3…..F4/F6. (ii)Universal Cards 1. Mother Board (N897095300Q) – This card can be used for all types of AFTC. 2. RT_NDV Card (N897092015C) - This card can be used for straight track circuits of any frequency (F1 to F14). 3. Modem Card (Two type) – I. Modem Card - (N897091012N) - This card can be used for straight track circuits of low frequency (F1 to F6). II. Modem Card - (N897091013P) - This card can be used for straight track circuits of high frequency (F7 to F14). 5.6.2 For Centre-fed track circuits (i)Frequency dependent cards 1. Tx & Rx Module – there are 6 types from F1 to F6 2. Secondary Receiver (Rx) Module - there are 6 types from F1 to F6 3. Tuning Unit – There are 12 types of TU Boards e.g. F1/F3…..F4/F6 & F1MPU….F6MPU. (ii)Universal Cards 1. Mother Board (N897095300Q) – This card can be used for all types of AFTC. 2. RT_NDV Card (N897092015C) - This card can be used for straight track circuits of any frequency (F1 to F14). 3. Modem Card - (N897091012N) - This card can be used for straight track circuits of low frequency (F1 to F6). 5.6.3 For Point zone track circuits (i)Frequency dependent cards 1. Tx & Rx Module – there are 8 types from F7 to F14 2. Tuning Unit – There are 16 types of TU Boards e.g. F7/F19…..F12/F14. (ii) Universal Cards 1. Mother Board (N897095300Q) – This card can be used for all types of AFTC. 2. RT_DV Card (N897092012Z) - This card can be used for all types of AFTC (F1 to F14). 3. Modem Card - (N897091013P) - This card can be used for high frequency AFTCs

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

(iii) Point Receiver Point Rx1 Channel (N897044102PR) – This card can be used for point zone track circuit with one Transmitter and two Receivers. Point Rx1 Channel (N897044103PR) – This card can be used for point zone track circuit with one Transmitter and three Receivers 5.7 ,ybZMh ladsr ,oa ijh{k.k fcanq LED indications and testing points LED indications are provided at the front of major modules/cards. For troubleshooting purposes, the voltages at the power unit and measuring sockets of the major modules/cards can be measured. The permitted values are given in tables of Fig. AD J.VRX

AD J.VTX 1 3 5 7 9 11 13 15

2 4 6 8 10 12 14 16

M SR + 4

16 14 12 10 8 6 4 2

15 13 11 9 7 5 3 1

M SR 2 2 0 KH z

BIT1 M 2 0 V LO C

V.TX

MO D

1

BIT0 M

V.RX O U T M SR

4 2

D EM

1 O U T PU T

TX

RX RT

FU SE 2 4 VLO C

M O D EM

+ 5V CD -1 2 V BIT1 D

V.IN V.O U T

+ 12V

BIT0 D

GND

LF

R

N

HF

D ELAY1 F1 O SC .IN T

SW 2

F2

Fig.5.5: LED indications/Test points for Straight Track Circuit (End Fed) Note: the input power line voltage must be 220/110 Vac ± 5% before the power conversion unit Use only 2 mm dia meter probe. Selection of Mulimeter - TX3 for TEXTRONICS, 187, 189 for FLUKE and 18S IRS for RISHABH

FU SE

FU SE

SW 1 50V

O SC .EXT

2 4 V D IG 2 4 V.SW

L E D ’s

TRIM M ERS

FUSE

V O L T A G E M E A S S U R IN G S O C K E T S U S E 2 m m D IA P R O B E O N L Y

Table IV Measuring sockets V-TX@ 50V fuse V-OUT AT 50V 50 V DC 24 V DIG V-IN V-RX V-RX MSR +/20 KHZ Voltage 24 V LOC

Measuring location TX TX TX RX RX RX RX RT RT RT

Multi-meter selection AC (AUTO) AC (AUTO) DC (AUTO) DC (AUTO) AC (AUTO) AC (AUTO) AC (AUTO) DC (AUTO) Hz (AUTO) DC (AUTO)

Section V – Alstom DigiCode AFTC

Permitted value

Remarks

6 – 90 V AC 2 - 45 V AC 45 – 58 V DC 22 – 28 V DC > 0.220 V AC 0.400 – 1.20 V AC 0.010 - 0.280 V AC 9.8 – 25 V DC 24 -32 V AC 21 – 27 V DC

-----Track Circuit Vacant/Free Track Circuit Occupied ----

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 OUT MSR OUT MSR OUTPUT OUTPUT +5V - 12 V + 12 V

RT RT RT RT RT RT RT

DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO)

4.8 – 6.8 V DC < 4.2 V DC 20 – 28 V DC < 0.6 V DC 4.9 – 5.1 V DC -12.2 – 11.8 V DC 11.8 – 12.2 V DC

Track Circuit Vacant/Free Track Circuit Occupied Track Circuit Vacant/Free Track Circuit Occupied ----

Fig.5.6: LED indications/Test points for Straight Track Circuit (Centre Fed) ADJ.VRX

ADJ.VTX 1 3 5 7 9 11 13 15

2 4 6 8 10 12 14 16

ADJ.VRX

MSR + 4

16 14 12 10 8 6 4 2

15 13 11 9 7 5 3 1

MSR 2

MOD

1

20KHz

BIT1M 20V LOC

V.TX

15 13 11 9 7 5 3 1

MSR + 4

16 14 12 10 8 6 4 2

MSR 2 20KHz

BIT1M 20V LOC

BIT0M

V.RX

BIT0M

V.RX OUT MSR

4 2

OUT MSR DEM

OUT PUT

RT NDV

OUT PUT

Sec. RX MODEM

FUSE 24VLOC

RT NDV

+ 5V

CD

-12V

-12V BIT1D

V.IN + 12V

BIT1D

V.IN

BIT0D

+ 12V

BIT0D

GND

LF

GND

LF

N

HF

N

HF

R

R

DELAY1

DELAY1 F1

F1

OSC.INT

SW2

OSC.INT

SW2

F2 FUSE

FUSE

50V

24V DIG

Sec. MODEM

+ 5V CD

V.OUT

DEM

1

RX FUSE 24VLOC

4 2

1

TX

MOD

1

F2 FUSE

SW1

OSC.EXT

SW1

OSC.EXT

24V DIG 24V.SW

24V.SW

L E D ’s

TRIM M ERS

FUSE

V O LT A G E M E A S S U R IN G S O C K E T S U S E 2 m m D IA P R O B E O N L Y

Table V Measuring sockets V-TX@ 50V fuse V-OUT AT 50V 50 V DC 24 V DIG V-IN V-RX V-RX MSR +/20 KHZ Voltage 24 V LOC OUT MSR OUT MSR

Measuring location TX TX TX RX RX RX RX RT RT

Multi-meter selection AC (AUTO) AC (AUTO) DC (AUTO) DC (AUTO) AC (AUTO) AC (AUTO) AC (AUTO) DC (AUTO) Hz (AUTO)

6 – 90 V AC 2 - 45 V AC 45 – 58 V DC 22 – 28 V DC > 0.220 V AC 0.400 – 1.20 V AC 0.010 - 0.280 V AC 9.8 – 25 V DC 24 -32 V AC

-----Track Circuit Vacant/Free Track Circuit Occupied ---

RT RT RT

DC (AUTO) DC (AUTO) DC (AUTO)

21 – 27 V DC 4.8 – 6.8 V DC < 4.2 V DC

-Track Circuit Vacant/Free Track Circuit Occupied

Section V – Alstom DigiCode AFTC

Permitted value

Click for Contents

Remarks

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 OUTPUT OUTPUT +5V - 12 V + 12 V

RT RT RT RT RT

DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO)

20 – 28 V DC < 0.6 V DC 4.9 – 5.1 V DC -12.2 – 11.8 V DC 11.8 – 12.2 V DC

Track Circuit Vacant/Free Track Circuit Occupied ----

Selection of Mulimeter - TX3 for TEXTRONICS, 187, 189 for FLUKE and 18S IRS for RISHABH Use only 2 mm dia meter probe

Fig. 5.7: LED indications/Test points for Point Zone Track Circuit A D J.VRX

A D J.VTX 1 3 5 7 9 11 13 15

2 4 6 8 10 12 14 16

M SR + 4

16 14 12 10 8 6 4 2

15 13 11 9 7 5 3 1

M SR -

2

2 0 KH z

2 0 V LO C V.TX

MO D

CD

BIT1 M

BIT1 M

BIT0 M

BIT0 M

1

V.RX O U T M SR

4 D EM

2

SW 2 O U T

1 O U T PU T

TX

RX RT

FU SE 2 4 VLO C

M O D EM

PO I N T RX

+ 5V CD CD

-1 2 V BIT1 D

V.IN V.O U T

+ 12V

BIT0 D

GND

LF

R

N

BIT1 D

HF

BIT0 D

D ELAY1 F1 O SC .IN T

SW 2

F2

SW 1 O U T

FU SE

FU SE

SW 1 50V

O SC .EXT

2 4 V D IG 2 4 V.SW

Measuring sockets V-TX@ 50V fuse V-OUT AT 50V 50 V DC 24 V DIG V-IN V-RX V-RX MSR +/20 KHZ Voltage 24 V LOC OUT MSR OUT MSR OUTPUT OUTPUT +5V

LE D ’s

TRIM M ERS

FUSE

VO LTA G E M E A SS U R IN G S O C KE T S U S E 2 m m D IA P R O B E O N LY

Measuring location TX TX TX RX RX RX RX RT RT

Multi-meter selection AC (AUTO) AC (AUTO) DC (AUTO) DC (AUTO) AC (AUTO) AC (AUTO) AC (AUTO) DC (AUTO) Hz (AUTO)

Permitted value

Remarks

6 – 90 V AC 2 - 45 V AC 45 – 58 V DC 22 – 28 V DC > 0.220 V AC 0.550 – 1.20 V AC < 0.280 V CAC 9.8 – 25 V DC 24 - 32 V AC

-----Track Circuit Vacant/Free Track Circuit Occupied ---

RT RT RT RT RT RT

DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO) DC (AUTO)

21 – 27 V DC 4.8 – 6.8 V DC < 4.2 V DC 20 – 28 V DC < 0.6 V DC 4.9 – 5.1 V DC

-Track Circuit Vacant/Free Track Circuit Occupied Track Circuit Vacant/Free Track Circuit Occupied --

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 - 12 V + 12 V SW1 OR SW2 SW1 OR SW2 SW1 OUT SW2 OUT

RT RT RT RT POINT RX POINT RX

DC (AUTO) DC (AUTO) AC (AUTO) AC (AUTO) DC (AUTO) DC (AUTO)

-12.2 – 11.8 V DC 11.8 – 12.2 V DC 4.1 – 4.7 V AC < 2.50 V AC 5 – 15 V DC 5 – 15 V DC

--Track Circuit Vacant/Free Track Circuit Occupied ---

Table VI Selection of Mulimeter - TX3 for TEXTRONICS, 187, 189 for FLUKE and 18S IRS for RISHABH Use only 2 mm dia meter probe

5.8 vuqj{k.k Maintenance 5.8.1 Replacing modules in the rack Before changing any element turn off the power of the rack including the modules to be replaced. It can be easily done either by turning off the front switch or the rear Power Conversion switch. A standard screwdriver can be used to unscrew the modules. Before replacing any rack module pay maximum attention to configure the board jumpers following the Putting into Service Manual and the calibration form. In case a TX_RX module is to be replaced, refer to the following instructions:  that the new module is of the same channel (frequency) as the original one by checking the item number of the module;  Set the ADJ. V.TX and ADJ V.RX front jumpers as the original positions;  that V.OUT has a value similar to that reported on the calibration form  that V.RX>0.5 Vrms  Perform a shunt test on track. In case a RT board is to be replaced set the P12-P13 and P5-P6 jumpers as the original positions, check the OUTPUT voltage and perform a shunt test on track. In case a MODEM board is to be replaced, set the channel selection (P1, P2, P3 ; P4, P12, P13 and P14) and protection code (P10 and P11) selection jumpers as the original positions. 5.8.2 Power Supply check The input power line voltage must be 220/110 Vac ± 5% before the power conversion unit. Ie input to the AFTC main cubicle or output of CVT. If no power, check switches (front and rear) in position 1.Ensure that rear Power Conversion fuses are not open, see Fig 5.9 below.

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

220 V line fuse

50 V 0

POWER CONVERSION

1

10 V

Fig.5.8: Power Conversion unit fuse Check of the front equipment fuses. If the front power LEDs do not lit, then check whether the corresponding fuse is open. Fuse 50Vcc 4A 250 V Fuse 24V Loc 1A 250 V Fuse 24V Dig 1A 250 V Fuse 12Vcc 1A 250 V (this fuse is inside TX_RX box, symbol F3) If some of the supply voltages is missing despite all the fuses are OK then replace the TX_RX module. 5.8.3 Indoor Adjustments (i) Gain adjustments of voltages in Tx/Rx Cards (Jumpers) ADJ.VTX

ADJ.VRX

Maximum 1

16

2

15 3

14

4

13 5

12

6

11 7

8

Minimum

10 9

9

8

10

7 11

6

12

5 13

14

Maximum

4 3

15

2

16

1

Fig. 5.9: Jumper selection for Gain adjustments in Tx/Rx cards 7-8 & 9-10 for minimum Gain setting Minimum 380 mV – 1.3 V Rx Voltage is obtained by regulating the above setting. (ii) Do’s & Don’ts for adjustments in Tx/Rx cards The V-Tx and V-Rx jumpers provided on the Tx-Rx Modules should be correctly positioned as indicated in Fig. below. Do not position the jumpers wrongly. .

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 1

1 2

2

3

3 4

4

5

5 6

6

7

7 8

8

9

9 10

10

11

11 12

12

13

13 14

14

15

15 16

16

RIGHT

WRON G X

Fig.

5.10: Sketch showing correct and incorrect jumper selection for Gain adjustments in Tx/Rx cards Don’t swap or remove any card in “Power ON” condition. Power must be OFF through the switch provided on front of Tx-Rx cassette. If there is a track circuit failure, please check the outdoor gears first prior to changing any cards of processing equipment. Don’t touch the semiconductors (ICs) of the boards with bare fingers, as they are sensitive to static electricity No adjustments are required to be done in outdoor tuning unit. 5.9 =qfV;ksa ds y{k.k Fault Diagnosis (i) OUTPUT is not present If the V.RX signal is present, (> 0.5 Vrms), but the OUTPUT is not present, then check if DELAY1 LED lits; If DELAY1 LED does not lit, then check the MODEM front showing the dynamic operation of the board, i.e. BIT1M and BIT0M LED flashing, CD green LED firmly liting, BIT1D and BIT0D LED flashing. If this is not the case, then replace the MODEM board. If the MODEM works, but DELAY1 does not lit, then comparator or delay1 module have failed; replace the RT board. If DELAY1 LED does lit, but OUT.MSR does not lit, then either the output stage of the RX filter or the 20 kHz generator or the magneto static relay might have failed. Check the MSR+ and MSR- voltage greater then 11 Vdc; if this voltage is not present, then the RX filter output stage has failed. Replace the TX_RX module. Check the 20 kHz test points greater than 24 Vrms; if this is not the case, then replace RT board. If the OUT.MSR LED lits and the relative test points have a voltage from 5.1 to 6.8 Vdc, but the OUTPUT is not present, then the delay2 module has failed. Replace the RT board. (ii) V.RX is not present  If track circuit is free this signal must be greater than 0.5 Vrms;  Check that V.IN signal has an amplitude greater than 0.6 Vrms

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 



If V.IN is not present check the signal on the Cable entry rack by means of the multimeter, if the RX signal is not present on entry rack, then check if the TX signal is present on the entry rack; if TX is not present, then V.OUT must be verified; if TX on cable entry rack is present, then check if the signal reaches the transmitting tuning box via the cable, then check the receiving tuning box; If the fault is at outdoors, check Electric ts and Tuning Unit and try rectifying them.

(iii) V.OUT is not present Check if V.TX signal is present. If it is not present, then replace MODEM board. If the V.TX signal is present and V.OUT is less then the value recorded during commissioning, then the TX filter has failed. Replace TX_RX module. If V.RX voltage is > 0.7 and SW1/SW2 voltages are > 4.5 and there is no out MSR or output, check 20 KHz signal availability on RT card. If 20 KHz signal is not present, then replace POINT RX card. 5.10 VwyfdV Tool Kit Table VII- Indoor Toolkit Sr. No. 1.

Description Digital Multimeter

Size Standard

2.

Frequency selective voltmeter Screw Driver

385X265X100

Insulated Mini Nose Plier Round Wire stripper & Cutter Non-Metallic Long Screw Driver (for adjustments)

6”

3. 4. 5. 6.

Set

Standard 6 mm dia X 150 mm long

Make TEXTRONICS or FLUKE or RISH ALSTOM

Spec./Part No. TX3, 187, 189, 18S 441FSV

TAPARIA or EASTMAN TAPARIA or EASTMAN MULTITECH Reputed make

Standard Standard 150B Standard

Table VIII- Outdoor Toolkit Sr. No. 1. 2. 3.

Description TSR Box Hydraulic Tool Kit Screw Driver

Size

4.

Screw Driver (Long)

5. 6. 7. 8. 9.

Nut Driver Nut Driver Insulated Mini Nose Plier Round Wire stripper & Cutter Double ended spanner

6 mm dia X 250 mm 7(M4) 10(M6) 6”

10.

Double ended spanner

14 X 15

11.

Double ended spanner

16 X 17

Section V – Alstom DigiCode AFTC

--Set

Standard 12 X 13

Click for Contents

Make ALSTOM ALSTOM TAPARIA or EASTMAN TAPARIA or EASTMAN TEPCO TEPCO TAPARIA or EASTMAN MULTITECH TAPARIA or EASTMAN TAPARIA or EASTMAN TAPARIA or EASTMAN

Spec./Part No. A489441001A 441900100 Standard 826 Standard Standard Standard 150B 16/E2001/3 16/E2001/3 16/E2001/3

May 2013

CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 12. 13. 14. 15.

Double ended spanner

13

18 X 19

TAPARIA or 16/E2001/3 EASTMAN Double ended spanner 27 X 32 TAPARIA or 16/E2001/3 EASTMAN Hammer with long handle 500 gm Standard AS per IS841-83 Non-Metallic Long Screw 6 mm dia X 150 Reputed make Standard Driver (for adjustments) mm long

Note: A wireless set or mobile phones may be used for communication between field and AFTC center location.

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

5.11 =qfV fuokj.k gsrq ¶ykspkVZ Troubleshooting Troubleshooting Flowchart 1

Troubleshooting Flowchart 2 Check of Modulator and TX board

Fault location

The problem is located after the receiving circuits

YES

Check Mother board, cabinet wiring, track relay or Interlocking

Does the OUTPUT led on the RT board lit ?

NO

The problem is located after the TX board

Connect a probe to jumper P23 and ground GND4 on the Modem board

The problem is located either inside Digicode Processing Unit or in the track

YES

Is V.OUT on the TX_RX module close to the value it had at commissioning ?

Locate connections of the TX cable inside the cable entry rack or on the CN2 connector

Replace the Modem board

NO

NO

Go to “Transmitter circuits” Flowchart

Is the signal at jumper P23 similar to that of fig.5-4 ?

NO Replace TX_RX module

The fault is located either in the cabinet wiring or on the RX board (1)

NO

Is voltage at above mentioned connections close to the value it had at commissioning ?

YES

Is V.RX on the TX_RX module greater than 0.5 VRMS?

The problem is located either in the field equipment or in the track

(1)

YES

Is V. TX on the TX_RX module close to the value it had at commissioning ?

YES

YES

The fault is located either in the track or in the receiving circuits

Go to “Receiving circuits” Flowchart

YES

YES OK

NO

Are ADJ. V.RX jumpers in the position they were set at commissioning ?

NO

TX filter has failed Re-establish commissioning set-up

NO

Replace TX_RX module

Both TX and RX signals go through the RX board

Section V – Alstom DigiCode AFTC

Is V.OUT on the TX_RX module close to the value it had at commissioning ?

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

Troubleshooting Flowchart 3

Troubleshooting Flowchart 4

Receiving circuits check

NO

Is MSR+,MSRon the RT board > 10 Vdc ?

The signal amplifier on thr RX board has failed. Replace TX-RX module

Check of trackside equipment YES

Do BIT0D and BIT1D lit ?

YES

NO

Is voltage at terminals CN3 (CN4) of the TX tuning unit >3.6xV.OUT ?

NO

Possible failure at the TX pair of the cable

Demodulator has failed. Replace MODEM board

Replace the Tuning Unit board NO

Does the Delay 1 led on the RT board lit ?

NO

YES

YES

Either Comparator or Delay 1 circuit has failed

Either 20 kHz oscillator or MSR has failed

Replace RT board

Is voltage at A-B (B-C) terminals of the TX tuning unit >0.04xVCN3 (VCN4) ?

NO

Verifify integrity of the S_Bond cable and its rail connections

NO Does the OUTMSR led on the RT board lit ?

Delay 2 circuit has failed

YES

Verifify integrity of the S_Bond cable and its rail connections

NO

Is track voltage at the RX end of the t.c. close to VAB (VBC) ?

YES

Is track voltage at the TX end of the t.c. close to VAB (VBC) ?

YES

YES

Is track voltage at the RX end of the t.c. >0.12 Vrms ?

NO

YES Replace RT board NO

Does YES the Delay 1 led on the RT board lit ?

The output stage of the Demodulator circuit might be damaged. Replace MODEM board

NO

Broken rail, short circuit between the rails or involuntary earth connection

Is VCN3 (VCN4) in the RX tuning unit >1.15 Vrms ?

YES

OK

Replace the Tuning Unit board

Possible failure at the RX pair of the cable

Restore original RT board



Section V – Alstom DigiCode AFTC

May 2013

16 Fault Diagnosis/LED indicators combinations for straight track circuits ○ – LED OFF ● – LED ON/Flashing

BIT 0D

RELAY

Section is clear

--

DN

Section is occupied

--

DN

Power conversion 10 V & 50 V fuse failure

Replace

4

○ ● ● ○

○

●

●

● ○ ● ○

● ● ○ ●

○

DN Tx card 50 V fuse failure

Replace

5

● ○ ● ○

○

●

●

● ○ ● ○

● ● ○ ●

○

DN 24 V DIG fuse failure

Replace

6

● ● ○ ○

○

●

●

● ○ ● ○

● ● ● ●

●

DN

● ● ● ○

○

●

●

● ○ ● ○

● ● ● ●

○

DN

8

● ● ● ○

○

●

●

● ○ ● ○

● ● ○ ●

○

DN

24 V LOC fuse failure VRx Voltage less than 400 mV VRx Voltage above 1.3 V

Replace

7

9

● ● ● ○

○

●

●

● ○ ● ○

● ● ● ●

●

DN

● ● ● ●

○

●

●

● ○ ● ●

● ● ● ●

●

DN

● ● ● ○

○

●

●

● ○ ● ○

● ● ● ●

●

DN

● ● ● ○

○

●

●

● ○ ● ○

● ● ● ●

●

DN

11

12

Section V – Alstom DigiCode AFTC

BIT 1D

● ○ ○

CD

● ● ● ● ● ● ○ ● ● ● ○ ●

BIT 0M

+ 12V

● ○ ● ● ● ○ ● ○ ● ○ ● ○

BIT 1M

- 12V

● ● ●

DELAY 1

+ 5V

● ● ●

N

OUT-PUT

● ○ ○

UP

3

● ● ● ● ● ● ● ○ ○ ● ● ○

10

MODEM

R

24 V DIG

1 2

RT

OUT MSR

R X 24 V LOC

T X

50 V

Table IX S No

CAUSE

Output is not present

Output is not present

DELAY1 does not lit

DELAY1 does not lit

ACTION REQUIRED

Adjust between 500 mV- 1.2 V Adjust between 500 mV- 1.2 V Check VRx voltage. Should be 0.5 Vrms. If Delay1 lits, then replace RT card. Check VRx voltage. Should be 0.5 Vrms. If Delay1 & OUT MSR lits, then the Delay2 module of RT might have failed. Replace RT card. Check VRx voltage. Should be 0.5 Vrms. Check Modem, if all indications are available then Comparator or Delay1 module of RT might have failed. Replace RT card. Check VRx voltage. Should be 0.5 Vrms. Check Modem, if all indications

May 2013

13

● ● ● ○

○

●

●

● ○ ● ○

● ● ○ ○

●

DN

14

● ● ● ○

○

●

●

● ○ ● ●

● ● ● ●

●

DN

15

● ● ● ○

○

●

●

● ○ ● ●

● ● ● ●

●

DN

16

● ● ● ○

○

●

●

● ○ ● ○

● ● ● ●

●

DN

17

● ● ● ○

○

●

●

● ○ ● ○

● ● ○ ○

●

DN

● ● ● ○

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●

●

● ○ ● ○

● ● ○ ○

●

DN

● ● ● ○

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●

●

● ○ ● ○

● ● ○ ○

●

DN

● ● ● ○

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●

●

● ○ ● ○

● ● ● ●

○

DN

● ● ● ○

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●

●

● ○ ● ○

● ● ● ●

○

DN

18

19

20

21

Section V – Alstom DigiCode AFTC

ACTION REQUIRED

RELAY

CAUSE

BIT 0D

BIT 1D

CD

BIT 0M

BIT 1M

DELAY 1

N

R

MODEM

+ 12V

- 12V

+ 5V

OUT-PUT

RT

OUT MSR

R X 24 V LOC

T X

24 V DIG

S No

50 V

17

BIT1D & CD do not lit OUT MSR does not lit OUT MSR does not lit

VRx is not present V IN is not present

V IN is not present

V IN is not present

V Tx is not present

V OUT is not present

are not available then Output stage of Modem might have failed. Replace MODEM card. Check VRx voltage. Should be 0.5 Vrms. Replace MODEM card If Delay1 lit then check MSR+ . If not available then replace Rx Module. If Delay1 lit then check if 20 kHz is greater than 24 Vrms . If not then replace RT Card. Check V IN signal . If V IN is more than 0.2 Vrms then replace Rx module. Check the Receiver signal on CT rack/LD load side. If it is available then replace LD or Rx cable to motherboard. Check track voltage at the Rx and voltage across AB or BC > 0.12 Vrms of TU VAB or VBC. If not then check for broken rail, short circuit between rails or S or Track lead wire cut. Check track voltage at the Rx and voltage across AB or BC > 0.12 Vrms of TU VAB or VBC and then check voltage at CN3 or CN4 in the Rx tuning unit >1.15 Vrms of track voltage. If not replace Receiver TU. Check the Transmitter signal from Modem on P23 with GND4. If the signal is not present, replace Modem. Check VTx signal is present and V OUT is less than the original value, then replace Tx module.

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○ – LED OFF

● – LED ON/Flashing Fault Diagnosis/LED indicators combinations for Point zone track circuits

Table X CAUSE

BIT 1M

BIT 0M

BIT 1 D

BIT 0D

RELAY

● ●

● ●

● ○ ● ● ● ○ ● ○

● ●

● ● ● ● ○ ●

● ● ● ○ ○ ●

● ○

Section is clear

DN

3

○

●

●

○

○

●

●

● ○ ● ○

●

● ○ ●

○ ○ ●

○

DN

Section is occupied Power conversion 10 V & 50 V fuse failure

○

●

●

○

○

●

●

● ○ ● ○

●

● ○ ●

○ ○ ●

○

DN

●

○

●

○

○

●

●

● ○ ● ○

●

● ○ ●

○ ● ●

●

DN

●

●

○

○

○

●

●

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●

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● ○ ●

○

DN

●

●

●

○

○

●

●

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●

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○ ● ●

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

● ○ ●

○ ○ ●

○

DN

●

●

●

○

○

●

●

● ○ ● ○

●

● ● ●

● ● ●

●

DN

4

5

6

7

8

9

Section V – Alstom DigiCode AFTC

CD

DEL-AY 1

● ○

BIT 0D

+ 12V

● ○

BIT 1 D

- 12V

● ●

CD

+ 5V

● ●

UP

2

● ●

N

OUT-PUT

1

R

OUT MSR

POINT RECEIVER

24 V LOC

MODEM

24 V DIG

RT

50 V

Rx

S No

Tx

ACTION REQUIRED

---

Replace

Tx card 50 V fuse failure

Replace

24 V DIG fuse failure

Replace

24 V LOC fuse failure VRx Voltage less than 400 mV VRx Voltage above 1.3 V

Replace

Output is not present

Adjust between 500 mV1.2 V Adjust between 500 mV1.2 V Check VRx voltage. Should be 0.5 Vrms. If Delay1 lits, then replace RT card.

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19 CAUSE

BIT 1M

BIT 0M

BIT 1 D

BIT 0D

RELAY

○

●

●

● ○ ● ●

●

● ● ●

● ● ●

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

● ● ●

● ● ●

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

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● ● ●

●

DN

●

●

●

○

○

●

●

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●

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● ○ ○

●

DN

●

●

●

○

○

●

●

● ○ ● ●

●

● ● ●

● ● ●

●

DN

●

●

●

○

○

●

●

● ○ ● ●

●

● ● ●

● ● ●

●

DN

11

12

13

14

15

Section V – Alstom DigiCode AFTC

CD

DEL-AY 1

●

BIT 0D

+ 12V

●

BIT 1 D

- 12V

●

CD

+ 5V

●

N

OUT-PUT

10

R

OUT MSR

POINT RECEIVER

24 V LOC

MODEM

24 V DIG

RT

50 V

Rx

S No

Tx

Output is not present

DELAY1 does not lit

DELAY1 does not lit

BIT1D & CD do not lit OUT MSR does not lit OUT MSR does not lit

ACTION REQUIRED

Check VRx voltage. Should be 0.5 Vrms. If Delay1 & OUT MSR lits, then the Delay2 module of RT might have failed. Replace RT card. Check VRx voltage. Should be 0.5 Vrms. Check Modem, if all indications are available then Comparator or Delay1 module of RT might have failed. Replace RT card. Check VRx voltage. Should be 0.5 Vrms. Check Modem, if all indications are not available then Output stage of Modem might have failed. Replace MODEM card. Check VRx voltage. Should be 0.5 Vrms. Replace MODEM card If Delay1 lit then check MSR+ . If not available then replace Rx Module. If Delay1 lit then check if 20 kHz is greater than 24 Vrms . If not then replace

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BIT 1M

BIT 0M

BIT 1 D

BIT 0D

RELAY

○

●

●

● ○ ● ○

●

● ● ●

● ● ●

●

●

●

●

○

○

●

●

● ○ ● ○

●

● ○ ○

● ○ ○

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

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● ○ ○

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

● ○ ○

● ○ ○

●

DN

●

●

●

○

○

●

●

● ○ ● ○

●

● ● ●

○ ○ ●

○

DN

17

18

19

20

Section V – Alstom DigiCode AFTC

CD

DEL-AY 1

○

BIT 0D

+ 12V

●

BIT 1 D

- 12V

●

CD

+ 5V

●

DN

N

OUT-PUT

16

R

OUT MSR

POINT RECEIVER

24 V LOC

MODEM

24 V DIG

RT

50 V

Rx

S No

Tx

VRx is not present V IN is not present

V IN is not present

V IN is not present

V Tx is not present

ACTION REQUIRED

RT Card. Check V IN signal . If V IN is more than 0.2 Vrms then replace Rx module. Check the Receiver signal on CT rack/LD load ide. If it is available then replace LD or Rx cable to motherboard. Check track voltage at the Rx and voltage across AB or BC > 0.12 Vrms of TU VAB or VBC. If not then check for broken rail, short circuit between rails or S or Track lead wire cut. Check track voltage at the Rx and voltage across AB or BC > 0.12 Vrms of TU VAB or VBC and then check voltage at CN3 or CN4 in the Rx tuning unit >1.15 Vrms of track voltage. If not replace Receiver TU. Check the Transmitter signal from Modem on P23 with GND4. If the signal is not present, replace Modem.

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21 CAUSE

BIT 1M

BIT 0M

BIT 1 D

BIT 0D

RELAY

○

●

●

● ○ ● ○

●

● ● ●

○ ○ ●

○

DN

22

●

●

●

○

○

●

●

● ○ ● ●

●

● ● ●

● ● ●

●

DN

23

●

●

●

○

○

●

●

● ○ ● ●

●

● ● ●

● ● ●

●

DN

24

●

●

●

○

○

●

●

● ○ ● ●

●

● ● ●

● ○ ●

○

DN

○ – LED OFF

CD

DEL-AY 1

○

BIT 0D

+ 12V

●

BIT 1 D

- 12V

●

CD

+ 5V

●

N

OUT-PUT

21

R

OUT MSR

POINT RECEIVER

24 V LOC

MODEM

24 V DIG

RT

50 V

Rx

S No

Tx

V OUT is not present SW1/SW2 Voltage less than 4.2 V AC and VRx less than 0.6 V AC SW1/SW2 Voltage more than 3.8 V AC and VRx more than 0.6 V AC, no output present SW1/SW2 Voltage less than 1.9 V AC

ACTION REQUIRED

Check VTx signal is present and V OUT is less than the original value, then replace Tx module. Maintain the switch voltage more than 3.8 V AC and VRx voltage more than 0.6 V AC Check 20 KHz availability and if not present replace Point Rx Card

Increase the switch voltage by adjusting the DIP switches in Rx Card

● – LED ON/Flashing

Section V – Alstom DigiCode AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

Section VI

vulkYMks ;w ,e 71 vkWfM;ks fÝDosalh Vªsd lfdZV ANSALDO UM71 AUDIO FREQUENCY TRACK CIRCUIT 6.1 ifjp; Introduction The UM71 – AFTC is a remote fed, non-coded, t-less track circuit suitable for all non-RE, RE (DC Traction and AC Traction) areas. In this type of track circuit the Transmitter and Receiver can be centrally provided in the equipment room/relay room maximum 1 Km distance from the track circuit. This track circuit operates on frequency shift principle (FSK) where the basic frequency is shifted between two frequencies close to each other (i.e. basic frequency + 11 Hz) Δ F = 11Hz. Modulation rate is set by division of the basic frequency Fc by 128 i.e. modulation signal frequency =Fc/128. Carrier Frequency V1 - F1 - 1700 Hz V1 - F2 - 2300 Hz V2 - F1 - 2000 Hz V2 - F2 - 2600 Hz

Modulation rate 1700/128 = 13.3 Hz 2300/128 = 18.00 Hz 2000/128 = 15.6 Hz 2600/128 = 20.3 Hz

Assigned to Set 1 UP line Set 2 DN line

6.2 iz.kkyh dh jpuk System composition The system consists of following components: Indoor equipment (Equipment at relay room) Field equipment (Wayside equipment) 6.2.1 Indoor equipment The indoor equipment consists of following equipments: (i) Transmitter The transmitter generates a sinusoidal signal, at one of the four basic frequencies (Fc) 1700 Hz; 2000 Hz; 2300 Hz; 2600 Hz.

Section VI – Ansaldo UM 71 AFTC

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Fig.6.1: Front view of Transmitters of different AFTCs (ii) Receiver The receiver recognizes the carrier signal in quality (modulated frequency) and in quantity (level).

Fig.6.2: Front view of a Receiver

Section VI – Ansaldo UM 71 AFTC

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A+ A- 24V DC Input Input from Track on V1 V2

A+ A- 24V DC Input Tx AC Output on V1V8

Fig 6.3.: (a) Nomenclature of connectors in Transmitter (rear view) (b) Nomenclature of connectors in Receiver (rear view)

Section VI – Ansaldo UM 71 AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 (iii) Relay

It is a 24V DC, plug-in-type, non-proved type. (Ordinary Q series line Relay QN1 can be used as a Track Relay).

(iv) Power Supply 24 V DC Power supply is required as input to the Transmitter and Receiver which can be taken from a 230 V/24 V Battery Charger with battery backup or through 24 V DC module of an IPS if provided. 6.2.2 Field equipment (Wayside equipment) (i) Tuning & Matching Unit (TMU) There are two types of tuning units: - Tuning Unit F1 (V1 & V2): This consists of LC (inductive Capacitance) series circuit tuned at a frequency close to F2. - Tuning Unit F2 (V1 or V2): This consists of a LC series circuit, tuned at a frequency close to F1, mounted in parallel with a high value capacitor.

Fig.6.4: TMU at Transmitter end

Fig.6.5: TMU at Receiver end

(ii) Air Core Inductor (ACI) or O bond On electrified track, a non-saturable inductor, known as the ACI or O bond, is located at the centre of the Electrical Seperation t. ESJ length varies from 20 to 29 meters in accordance with Rail type, Sleepers type, Track gauge, Track electrified or non-electrified. There are two types of ACI - The ACI 200 - used for re-equalizing the traction current. - The higher power ACI 600- used for routing the traction return current. Fig.6.6: Air Core Inductor (ACI) or O bond

Section VI – Ansaldo UM 71 AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 6.3 dscy fcNkus gsrq ;kstuk Cabling scheme  PSU to Tx/Rx - Flexible wire 1 sq.mm.  Tx/Rx to TMU - Quad cable - 0.9 mm dia  TMU to Rail 70 sq.mm copper or 120 sq. mm Aluminum 6.4 rdfudh vks Technical data Table I Input voltage At PSU Output voltage Input voltage At Tx (KEM) Output voltage Frequency Gain adjustment (V1 –V10) Input at E1 & E2 At TMU (Tx end) Frequency Output of TMU Input across the track Voltage across the track At TMU (Rx end) (i.e. input to TMU at Rx end) Output of TMU (Rx end) Input to Rx (V1-V2) At Rx (KRV) Voltage at R1 R2 Gain adjustment (R3….R10) Pick Up T.S.R. At KRV K = Adjustment Drop T.S.R. RV = Rx input KRV Voltage across TR without At TR T.S.R. Voltage across TR with 0.5 Ohm T.S.R.

Section VI – Ansaldo UM 71 AFTC

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110 V + 25% 24 V DC + 1 24 V DC + 1 25 to 50 V AC 2300 Hz + 3 Hz V5 toV6 – 3 units 25 to 50 V AC 2300 Hz + 3 Hz 1 to 5 V AC 1 to 5 V AC 0.2 to 0.8 V AC 0 to 3 V AC i.e. V1 – V2 0 to 3 V AC > 250 mV AC KRV 56 1 Ohm 0.5 Ohm 56 24 to 30 V DC 0 V DC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 6.5 xsu lasfVax Gain setting For gain setting i.e. increase or decrease of outputs of Tx and Rx the adjustments are to be done as per the following tables 6.5.1 UM71 Gain adjustment table Table II -KEM Table – For Transmitter adjustment KEM (Gain) 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 5.75 6.00 6.25 6.50 6.75 7.00 7.25 7.50 7.75

Transmitter adjustment Shift Tx Output Provide jumpers cable from to between V1 to V8 to V4 V7 V5 & V6 V5 & V6 V1 V7 V2 & V4 V5 & V6 V2 V7 V3 & V4 V5 & V6 V1 V7 V3 & V4 V7 V8 V1 V8 V2 & V7 V2 V8 V3 & V7 V1 V8 V3 & V7 V4 V8 V5 & V7 V1 V8 V2 & V4 V5 & V7 V2 V8 V3 & V4 V5 & V7 V1 V8 V3 & V4 V5 & V7 V6 V8 V1 V8 V2 & V6 V2 V8 V3 & V6 V1 V8 V3 & V6 V4 V8 V5 & V6 V1 V8 V2 & V4 V5 & V6 V2 V8 V3 & V4 V5 & V6 V1 V8 V3 & V4 V5 & V6

Note: By default Tx output is on V1& V8 KTMU & KMU Adjustment tables Table III -KTMU Ratio Tx Setup Rx Setup

Table IV - KMU

10:1

Connection Cable E1 & E2

1:1 1:1.5 1:2

9 & 10 9 & 12 8&9

Jumpers

10 & 11

Section VI – Ansaldo UM 71 AFTC

Ratio Rx Setup IDC (*)

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1:1 1:1.5 1:2

Connection Cable 9 & 10 9 & 12 8&9

Jumpers 10 & 11

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Table V - KRV Table – For Receiver adjustment KRV Sr. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37

Receiver adjustment Shift Provide jumpers connectors between from R1 to R2 to R3 R4 R5 R4 R3 R5 R5 R7 R3 & R6 R5 R7 R4 & R6 R4 R7 R3 & R6 R6 R7 R3 R7 R4 & R6 R4 R7 R5 & R6 R3 R7 R5 & R6 R9 R7 R3 & R8 R5 & R6 R9 R7 R4 & R8 R5 & R6 R9 R7 R3 & R8 R4 & R6 R9 R7 R6 & R8 R9 R4 R5 & R7 R6 & R8 R9 R3 R5 & R7 R6 & R8 R9 R3 R5 & R7 R9 R5 R3 & R8 R9 R5 R4 & R8 R9 R4 R3 & R6 R9 R8 R9 R3 R4 & R8 R9 R4 R5 & R8 R9 R3 R5 & R8 R9 R5 R3 & R6 R7 & R8 R9 R5 R4 & R6 R7 & R8 R9 R4 R3 & R6 R7 & R8 R9 R6 R7 & R8 R9 R3 R4 & R6 R7 & R8 R9 R4 R5 & R6 R7 & R8 R9 R3 R5 & R6 R7 & R8 R10 R7 R5 & R6 R3 & R9 R10 R7 R5 & R6 R4 & R9 R10 R7 R4 & R6 R3 & R9 R10 R7 R6 & R9 R10 R7 R3 & R6 R4 & R9 R10 R7 R4 & R6 R5 & R9

Section VI – Ansaldo UM 71 AFTC

KRV Sr. No. 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73

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Receiver adjustment Shift Provide jumpers connectors between from R1 to R2 to R3 & R6 R5 & R9 R10 R7 R3 & R9 R10 R5 R4 & R9 R10 R5 R3 & R9 R10 R4 R10 R9 R4 & R9 R10 R3 R5 & R9 R10 R4 R5 & R9 R10 R3 R3 & R6 R10 R5 R3 & R6 R7 & R9 R10 R5 R4 & R6 R7 & R9 R10 R4 R3 & R6 R7 & R9 R10 R6 R7 & R9 R10 R3 R4 & R6 R7 & R9 R10 R4 R5 & R6 R7 & R9 R10 R3 R5 & R6 R7 & R9 R10 R7 R5 & R6 R3 & R8 R10 R7 R5 & R6 R4 & R8 R10 R7 R4 & R6 R3 & R8 R10 R7 R6 & R8 R10 R7 R3 & R6 R4 & R8 R10 R7 R4 & R6 R5 & R6 R10 R7 R3 & R6 R5 & R8 R10 R5 R3 & R6 R10 R5 R4 & R6 R10 R4 R3 & R8 R10 R8 R10 R3 R4 & R6 R10 R4 R5 & R8 R10 R3 R5 & R8 R10 R5 R3 & R6 R7 & R8 R10 R5 R4 & R6 R7 & R8 R10 R4 R4 & R6 R7 & R8 R10 R6 R7 & R8 R10 R3 R4 & R6 R7 & R8 R10 R4 R5 & R6 R7 & R8 R10 R3 R5 & R6 R7 & R8

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Fig.6.7: Block diagram of a typical UM71 AFTC

Section VI – Ansaldo UM 71 AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 6.6 vuqj{k.k Maintenance Record readings as per schedule in the following proforma. (With Sample reading) 6.6.1 Indoor Track Circuit No.: A504T Table VI Date Transmitter DC AC Power Power Supply Supply A+ AV1 V8 07.12.2011 24.46 V 41.20 V

Reciever DC Power Supply AC Power Supply

A+ A24.36 V

L+ LV1 V2 24.46 V 890 mV

Signature of Maintainer

R1 R2 348 mV

Fig.6.8: Measurement of AC output voltage in rear of Tx (terminals V1V8)

Fig.6.9: Measurement of AC output voltage at CTB

Section VI – Ansaldo UM 71 AFTC

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

The intactness of wire connectors in rear of Transmitter and Receiver unit should be checked frequently to avoid disconnection. But while doing so it should be ensured that there is no train movement taking place and no signal involving the track circuit under observation is cleared.

Fig. 6.10: Rear view of the Transmitter 6.6.2 Outdoor Table VII - At TMU Tx end Date AC Input at Frequency E1 & E2 (Hz)

AC Output of TMU

07.12.2011 40.5 V

4.5 V

2000 Hz

AC Input across the track 4.4 V

Signature of maintainer

Fig.6.11: Measurement of AC input voltage at terminals E1 & E2 of Tx end TMU

Section VI – Ansaldo UM 71 AFTC

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11

CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Table VIII -At TMU Rx end Date

AC Voltage across the track (i.e. input to TMU at Rx end) 07.12.2011 0.790 V

AC Output of TMU (Rx end)

Signature of maintainer

0.628 V

Fig.6.12: Measurement of AC output voltage at terminals 9 & 10 of Rx end TMU During every visit (fortnightly) open the TMU apparatus case and check the tightness of outgoing lead wire connected to rail. Tighten it with the spanner provided with the tool kit.

Fig.6.13: Opening of TMU apparatus case

Section VI – Ansaldo UM 71 AFTC

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12

Fig.6.14: Tightening of outgoing lead wire Check the intactness of lead wire connected to rail.

 Fig.6.15: Lead wire connection to rail  

Section VI – Ansaldo UM 71 AFTC

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1

Section - VII

fuokjd vuqj{k.k PREVENTIVE MAINTENANCE 7.1

vuqj{k.k gsrq tkap Maintenance checks The following checks shall be performed regularly for preventive maintenance of AFTC: Visually check the electric ts periodically and ensure that these are in good condition. This includes connection to the rails, condition of electric t cable, connections to the Tuning Unit, condition of all welded and screw ts on the track (S-bond, terminal bond, shunt bond, connecting ropes, interconnections etc.)

  Fig. 7.1: Connections to the rail (a) Connection from Tuning Unit (b) Rail bonds Check the various voltages indicated in the data sheet of AFTC equipment in consideration to the climatic conditions, and particularly ballast condition. Then compare the values found with the values recorded at the time of putting into operation. In case of significant differences which cannot be justified by different climatic conditions, and in particular if values due to external conditions are found to be in limits, there might be a failure and the cause needs to be investigated. Perform drop shunt test with TSR to adjust the receiver energization level. Ensure that the surfaces of the rails are clean so that a reliable axle shunt can be maintained. Deterioration of the ballast resistance can be detected by checking receiver voltage periodically.

Section VII – Preventive Maintenance

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2

7.2 cká 'kaV }kjk ijh{k.k Testing with external shunt (a) Apply a non-inductive 0.5 Ohm resistance in any position on the track circuit (except for portion of tuned zone/electric separation ts). The respective track relay should deenergize.

Fig. 7.2: Track circuit shunted at any portion except tuned zone. (b)Check whether a non-inductive resistance of 0.15 Ohm interposed anywhere inside the tuned zone/ESJ causes de-energization of at least one of the two successive track circuits

Fig. 7.3: Track circuit shunted in tuned zone (c) Apply a non-inductive resistance of 0.15 Ohm in overlap zone of ESJ (Overlap zone as prescribed by manufacturer). Track relay of both the AFTCs should drop

Fig. 7.4: Track circuit shunted at overlap zone of ESJ

Section VII – Preventive Maintenance

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7.3 vuqj{k.k ds le; lko/kkfu;ka Precautions during maintenance After a change in outdoor installation/interconnection, do all the adjustments as applicable for initial installation. After change of a module of indoor equipment, ensure adjustments/measurements in the changed module as per initial installation and TSR test should be conducted. Perform the TSR adjustment in dry weather conditions only. If same is done during monsoon, ensure that there is no water logged in between rails and ballast/mud/dirt is not touching rails. Repeat the TSR check as soon as weather normalizes and correct the settings. In failure during monsoon, increase gain adjustment till satisfactory operation is attained. Check TSR without fail. After the monsoon season, restore the gain to original setting, else there could be unsafe failure. In case a TX_RX module is to be replaced, that the new module is of the same channel (frequency) as the original one by checking the item number of the module. If there is a track circuit failure, check the outdoor gears first prior to changing any cards of processing equipment. To carry out measurements, the necessary measuring equipment and related tools should be as per the prescribed tool kit. After commissioning, no adjustments should be done except during monsoon when the ballast resistance is affected. In case of failure during monsoon, gain adjustment to be increased till satisfactory operation is attained. TSR should be checked without fail. After the monsoon season the gain should be restored to original setting at the time of commissioning, else there could be unsafe failure.   

Section VII – Preventive Maintenance

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Section - VIII

D;k djsa o D;k u djsa DO’s & DON’Ts 8.1

D;k djsa

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Check connection to the rails and condition of electric t cable on each visit. Earth screen of Isolation transformer. Provide separate Surge arrestor on Rx. Use proper size cable prescribed in the installation manual for Rail Bonding in the tuned area. Carry out Drop Shunt Test at Rx end. Ensure dropping of relay with TSR of 0.5 Ohms outside and TSR of 0.15 Ohms inside the tuned area. In case of failure during monsoon, gain adjustment to be increased till satisfactory operation is attained. TSR should be checked without fail. After the monsoon season the gain should be restored to original setting at the time of commissioning, else there could be unsafe failure.

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Do’s

8.2

D;k u djsa

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Do not use same power supply for feeding more than one Tx or Rx of same frequency. Do not take measurements when a train is in the vicinity of Track Circuit in RE area. Don’t keep Level crossing inside tuned area. Don’t provide Impedance bond in tuned area. Don’t change output Relay when Rx is working. Don’t provide Axle Counter Tx/Rx coil within 200 m of AFTC. Don’t provide Axle Counter in or within 18 to 20 m of any tuned area/any ETU. Don’t install AFTC where SEJ falls inside tuned area. Do not short circuit TU or disconnect Tx or Rx from tuning unit unless both adjacent track circuits are switched OFF. Don’t do adjustments after commissioning except during monsoon when the ballast resistance is affected.

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Don’ts

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Section VIII – Do’s & Don’ts

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

Section - IX

Ckgq/kk iwaNs tkus okys iz’u Frequently Asked Questions Q.1

What are the main advantages of Audio Frequency Track Circuits over conventional AC/DC Track Circuits?

Ans.

AFTCs are immune to high levels of interference due to traction harmonics present in AC or DC electrified areas. AFTC can be universally used in AC, DC and NonRE sections.

Q.2

Why insulation ts are normally not required in AFTC?

Ans.

The separation between adjacent track circuits is achieved through Electrical ts formed with the help of rails, bonds and Tuning units. The mutual interference between adjacent track circuits is avoided by using different frequencies.

Q.3

Why insulation ts are required in point zone provided with Audio Frequency Track circuits?

Ans.

In points provided with AFTC, the insulated rails are not connected in series unlike in conventional track circuits. The legs are connected in parallel and detected individually by separate receivers. Hence insulated ts are required to avoid short circuit at the frog. An example is shown in the figure below.

Fig9.1.: AFTC in point zone Q.4

Why the signal is not directly ed on from feed end to relay end in an AFTC? Why modulation is required?

Ans.

Modulation is required to provide greater security and to enable the information to be ed along the track without being distorted.

Section IX – FAQs

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0 Q.5

Why AC voltage is used in the operation of AFTC?

Ans.

In AC voltage, Amplitude, Frequency and Phase are available hence modulation and de-modulation can be achieved.

Q.6

Why Audio Frequency range (20 Hz to 20 KHz) is selected?

Ans.

Audio Frequency range is selected due to following properties  Non-stationary.  Random in nature.  Generation is easy.  Attachment and extraction of information is easy.  High level of noise immunity.

Q.7

Why code bits are required?

Ans.

To avoid interference of other track circuits with same frequency. For security purpose.

Q.8

What is the role of tuning unit in AFTC?

Ans.

The tuning unit is provided to adjust the RLC value in given frequency band for resonance so that maximum signal is transmitted along the track. The tuning unit along with rails and bonds form the resonant R-L-C circuit. The Tx and Rx are resonated to the carrier frequency and have maximum power linkage.

Q.9

What will happen if mode of an AFTC is changed from low power to normal (high) power?

Ans.

Change in mode as above can make over- energisation of track relay. This can be hazardous as under shunted condition track relay may pick up.

Q.10 Why different type of bonds (Z-bond, S-bond, Alpha- bond) are provided in AFTC? Ans.

Due to imbalance in traction return currents between both the rails, there is a possibility that Tuning Unit (TU) may burn. To avoid this bonds are provided between two rails. Also along with rails and tuning unit these bonds form the resonant R-L-C circuit which helps in maximum signal transmission.

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Section IX – FAQs

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

ANNEXURE I

laf{kIr 'kCnkoyh ABBREVIATIONS ABB AC ACTM AF AFTC Al AWS BRS CT CVT CWR DC ESJ ETU FSK FSM FTGS GF1 GF2 Hz IB IP IPS IRS KV KHz KR LD LED LWR M ME MODEM MSK NC NO OEM OHE OP1 OP2 PCB RB

Asea Brown Boveri Alternating Current Alternating Current Traction Manual Audio Frequency Audio Frequency Track Circuit Aluminum Automatic Warning System British Railway Specification Cable Termination Constant Voltage Trasnsformer Continuous Welded Rail Direct Current Electrical Separation t End Termination Unit Frequency Shift Keying Frequency Selective Meter Remote Fed Coded Audio Frequency Track Circuit Siemens Track Relay 1 in Siemens AFTC Track Relay 2 in Siemens AFTC Hertz Intermediate Block Interlocking Plan Integrated Power Supply Indian Railway Specification Kilo Volt Kilo Hertz Crossing Lightning Discharger Light Emitting Diode Long Welded Rail Central Feed In Modulator-Demodulator Minimum Shift Keying Normally Closed Normally Open Original Equipment Manufacturer Overhead Equipment Output 1 Output 2 Printed Circuit Board Railway Board

Annexure I – Abbreviations

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

RDSO RE RLC Rx ST SWG TC TPR TPWS TSR TU TTU Tx VA W

Research Designs & Standards Organisation Railway Electrification Resistance Inductance Capacitance Receiver Standard Standard Wire Gauge Track Circuit Track Proving Relay Train Protection & Warning System Train Shunt Resistance Tuning Unit Track Tuning Unit Transmitter Volt Ampere Points

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Annexure I – Abbreviations

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CAMTECH/S/Proj/2013-14/HB-AFTC/2. 0

Annexure I – Abbreviations

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CAMTECH/S/PROJ/2013-14/HB-AFTC/2. 0 ANNEXURE II

lanHkZ REFERENCES 

IRS specification No. RDSO/SPN/146/2001.

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Alstom DIGICODE Audio Frequency Digital Track Circuit maintenance guidelines.

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Siemens FTG S Track Circuit - System Description Siemens FTG S Track Circuit – Instructions for use. Siemens FTG S Track Circuit – Adjusting instructions.

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Maintenance handbook on Audio Frequency Track Circuit (ABB make) CAMTECH/S/197

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Annexure II - References

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