digital axle counter

SINGLE SECTION DIGITAL AXLE COUNTER

MAINTAINENCE OF SSDAC

Presented bySandeep AggarwalTechnical Manager

Central Electronics Ltd.

MAINTENANCE OF SSDAC VERIFY SYSTEM HAS BEEN COMMISSIONED AS PER PRE

COMMISSIONING CHECKLIST & IS PROPERLY SIGNED BY CEL MOVEMENT OF TROLLEY’S HAS BEEN TESTED DURING PARALLEL

WORKING TRAINING PROVIDED TO STAFF SYSTEM PERFORMANCE SHALL BE SENT TO CEL REGULARLY. CONDUCT REGULAR TRAINING SESSIONS AT CEL OR YOUR

TRAINING INSTITUTES BY CEL STAFF.

MEASURE THE Tx COIL (21 KHz & 23 KHz) AND Rx COIL (21 KHz & 23 KHz) SIGNAL LEVELS. THEY SHOULD BE WITHIN LIMITS

MEASURE THE OUTPUT SIGNALS OF CARDS AT THE TEST POINTS PROVIDED ON CARDS

CHECK AND MEASURE THE INPUT POWER SUPPLY TO SSDAC

RESET BOX SHOULD BE INSPECTED FOR ITS PROPER FUNCTIONING

ALL CABLE CONNECTIONS ON THE CT BOARD OF APPARATUS AT LOCATION BOXEX SHOULD BE CHECKED

MAINTAINENCE OF SSDAC (CONTD …)

MAINTENANCE SCHEDULE (MONTHLY)


MAINTENANCE LOG SHEET FOR SSDAC

Kindly check the page 6 of 7 of pre commissioning checklist issued by RDSO

ALL EARTH CONNECTIONS SHOULD BE EXAMINED MONTHLY FOR CONNECTIONS AND SOLDERED JOINTS TO BE IN PROPER CONDITION

ARMOR OF QUAD CABLE SHOULD BE PROPERLY EARTH RESISTANCE OF EVERY EARTH SHOULD BE MEASURED ON

YEARLY BASIS. INSTALLATIONS NEAR SSP & FEEDER POINTS MAY BE

PROPERLY EARTHED


MAINTENANCE & TESTING OF MAINTENANCE FREE EARTHS

RECOMMENDED TOOLKIT

(1 set of tool kit to be purchased separately for every 10 sets of SSDAC systems)

1 Portable data analyzer for downloading event logger data for analysis and report generation.

2 Pure sine wave Digital multimeter make Fluke model 187/ Rishabh model 28S / Kusum Meco model 859CF or Equivalent

3 Train simulator, Model TS 267P CEL make

4 Extender card (Card No. 557)

5 Dummy wheel (as per Drg No. L007750A3, D14)

6 Ring spanner 17-19,24-26

7 Open end spanner 17-19, 24-26

8 Socket spanner with handle

9 Torque wrench (Jaicom JPR65 or equivalent, 88NM)

10 Screw Driver No. 902, 935

11 Marking jig for drilling (Drg No. F008300, on D29& D29A)

RECOMMENDED SPARES

The following spares are to be procured separately for 5 nos. of Single Section Digital Axle Counter working in field1 SCC 1&2 cards (Card 1 & 2) 2 Nos

2 MLB 1&2 cards (Card 3 & 4) 2 Nos

3 Modem card (Card 6) 1 No

4 Relay driver (Card 7) 1 No

5 Event Logger Card (Card 5) 2 Nos

6 DC-DC converter (Card 8) 1 No

7 Axle detectors (AD711) 21 KHz/23KHz (TX coil) 1 No

8 Axle detectors (AD711) 21 KHz/ 23 KHz (Rx coil) 1 No

9 Reset box RB-259 1 No

10 Vital Relay Box with Relay 24V, 1000 ohm, Q type 1 No

11 Surge voltage protection device box (SV-121) 1 No

DO’S & DON’TDO’S The inter connection drawings are to be followed for connecting the Transmitter &

Receiver coils. Tx1 is 21 KHz, Tx2 is 23 KHz & Rx1 and Rx2 coils are 21 KHz & 23 KHz, respectively.

Ensure that Receiver and Transmitter coil cables have been laid in different pipes. Ensure that both the TX coils & Rx coils are having proper alignment on Rail. Ensure that packing of sleepers with ballast on both sides of Axle detector is

proper. Check that metal sheaths of the outdoor cable are connected to earth at both ends The recommended cables for wiring of the system at site should be used. The steady Battery voltage 24V should be maintained. The cable connections should not be connected loosely. The M.S Circular connectors of SSDAC are checked and maintained firmly. The SSDAC & Reset box is provided with sealing arrangement. They should be

sealed at site. Resetting should be done only after ensuring that there is no train in the section

DON’T Don’t install the Axle detectors near the rail joint (should be more than

6 sleepers away). Don’t install the Axle detectors where the rail is badly worn out. Don’t cut or join the Transmitter / Receiver cables supplied along with

the coil. It would result in change of frequency of signal. Don’t lay the TX and RX coil cables in the same pipe. Don’t use any other outdoor cable other than the recommended

cables. Avoid installing the Axle detectors on curve of rail / too much slope of

rail to the possible extent. Don’t remove the cards from SSDAC units under power ON condition

of system. Remove card if necessary after Switching OFF the power to the unit.

TROUBLE SHOOTING OF SSDAC

FAMILIARITY WITH ERROR CODES

10 20

40 80

1 2

4 8

5 6

7 8

1 2

3 4

FRONT VIEW VALUE GIVEN TO LED’s

LSB

MSB

LSB

MSB

COUNT RELATED ERRORS ERRORS RELATED TO WRONG TRAIN MOVEMENT VITAL RELAY RELATED ERRORS HARDWARE SYNCHRONIZATION RELATED ERRORS POWER INTERRUPTION & COMMUNICATION RELATED

ERRORS

TROUBLESHOOTING OF SSDAC (CONTD …)

CLASSIFICATION OF ERROR CODES

COUNT RELATED ERRORS Error code 0x33, 0x34 & 0x35: the remote unit’s error code is checked

and diagnosed Error code 0x36 & 0x37: the Tx/Rx coils and SCC card are to be

checked


ERROR DUE TO WRONG WHEEL MOVEMENT Error 0x38 & 0x43: output of coil and SCC cards should be checked. Error 0x44, 0x45, 0x46, 0x47 & 0x48: comes due to formation of non-

overlap pulse. Any movement of trolley in the section should be checked.

VITAL RELAY RELATED ERRORS Error 0x15, 0x50, 0x51, 0x52 & 0x53: the VR should be checked for

proper insertion.


POWER & COMMUNICATION RELATED ERRORS Error 0x30: link between the two SSDAC units should be checked. Error 0x40, 0x41, 0x42: the communication media between the local and

remote units should be checked for noise or other interfering element. Surge Devices to be checked

Error 0x3F, 0x7F: reset operation for the local and/or remote unit should be proper

Error 0x80: remote unit should be checked and analyzed for error HARDWARE SYNCHRONIZATION RELATED ERRORS

Error 0x60, 0x62: Reset the system. If problem persists, MLB cards should be replaced


IN CASE OF LIGHTNING, THE SVPD DEVICES SHOULD BE CHECKED FOR PROPER WORKING

POWER LINE & RESET LINE SURGE MODULES ARE INDICATIVE TYPE SURGE DEVICES.

MODEM LINE DEVICES ARE NON INDICATIVE TYPE THE DAMAGED MODULE(S), IF FOUND SHOULD BE REPLACED

WITH FRESH MODULE(S) OF SIMILAR TYPE. CONTACT CEL FOR PART NOS


PRESENTATION CD INCLUDES

COPY OF SLIDES SSDAC INTRODUCTION SSDAC – MANITENANCE SSDAC - IMPROVEMENTS

INSTALLATION MANUALS OF BOTH AMPLITUDE & PHASE TYPE SSDAC

PRECOMMISSIONING CHECKLIST APPROVED BY RDSO

digital axle counter

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