Page 457 - IRSEM_Main Book

(c) Interlocking of Signals:

Clear the signal route 2WBI after setting the route. Try to clear the signal
4EB by operating the relevant switch/button. Signal 4EB should remain in
'ON' position and signal 2W should continue to display 'OFF' aspect.
Similar tests shall be carried out for signal 2E also.

(d) Track Circuit Controls:

(i) Clear the signal route 2WBI again. Shunt the track 2WT. Signal should
go to 'ON'. Remove the shunt, the signal should not re-clear. Normalize
route and re-clear again. Shunt A2ET and other controlling track
circuits one by one. Signal should go to 'ON' in all cases. Remove the
shunt. Normalize the route.

(ii) Where track circuits provided with redundancy, its proper working shall
be thoroughly tested for redundancy and effectiveness in the signalling
circuits. Detailed instruction and precaution for testing and fault
rectification shall be issued by Zonal Railway.

(e) Back Locking:

(i) Clear the signal 2W for route 2WBI again. Shunt the track 2WT. The
signal should go to 'ON'. Normalize the signal switch. The route should
be held. Shunt and clear all the back locking tracks as per selection
table in sequence. The route shall be released by sequential proving of
tracks as per the provisions of para 4.3.3 of Relay interlocking
specification IRS: S 36-87.

(ii) Clear the signal route 2WBI again and de-energize the Level Crossing
Gate control relay. The signal should go to 'ON'. Re-energize the relay,
the signal should assume 'OFF' aspect.

(f) Conditional Locking:

Wherever conditional locking is provided (for alternate overlap/parallel
movements etc. for yard flexibility), the points setting and its route holding,
correct proving in the signal circuits shall be thoroughly checked.

(g) Datalogger Circuits:
The data loggers connected to various power supplies, relays of internal/
external circuits, block instruments, battery chargers and other applications
like open/close status of relay room, battery charger/IPS/Invertors monitoring
etc. shall be regularly checked/tested. Also ensure the nominated JE/SSEs/
staff are receiving the various exception reports generated from the data
logger to aid their day to day works/ maintenance/fault restorations in
coordination with Fault control JE/SSEs/staff incharge of Datalogger
monitoring.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 405 of 535