Page 453 - IRSEM_Main Book

(d) Complete System Integrity testing shall be initiated only after all the field
functions are connected to the Relay Interlocking/Electronic Interlocking
(during Non-interlocking/Disconnection period in a working installation) and
simulation testing is completed and all errors removed.

(e) Complete tests shall be carried out against approved Selection Table/
Control Table/Route Control Chart. Checks against signalling plans for
main signal routes and a few spot checks of the remaining routes shall
also be carried out.

(f) Field Correspondence Tests: Full correspondence of field gears such as
aspects of Signals, Condition of Points, Status of Track circuits, LC gates
etc. with that of Control Panel/Control Terminal/VDU with respective position
of knobs, switches, and indications, must be verified and corrected to obtain
1:1 correspondence, before signing safety certificate (and ending Non-
interlocking/disconnection in a working installation) and allowing any
signalling installation being opened to Train traffic.

19.8.9 Following simple two line station example is given for an understanding on
how to conduct system integrity tests:

(a) Signal Control Circuits

Each route shall be set individually by operating control lever or switch(es)
and/or button (s) as the case may be. After checking that the signal for this
particular route has been cleared, each track circuit controlling the signal
shall be shunted individually to check that the signal goes back to danger.
Similar tests shall again be made by de-energizing point detection relays
and other relays controlling this route. Each such relay will be de-energized
individually and it shall be checked, that the signal goes back to danger.

(b) Approach Locking

Each route shall be set up individually. After ensuring that the signal for this
particular route has been cleared, each track circuit controlling the approach
locking shall be de-energised in turn. The signal shall be put back to 'ON'.
Efforts shall be made to alter the route under test and to set up conflicting
route. It shall be checked that it is not possible to cancel the route set up
and/or to set up a conflicting route and/or to individually operate any point
in the route under test. This locking shall be effective till the set route is
cancelled and the time release circuit has operated, provided the track
beyond the signal is not occupied.

(c) Dead Approach Locking

Where dead approach locking is provided, the same test procedure as in
para 19.8.9 (b) shall be adopted except that there is no controlling track
circuit to be de-energised. After the signal has been taken 'OFF', the
approach locking shall be effective till the signal is put back to 'ON' and
time release circuit has operated.

Chapter 19: Installation, Testing & Maintenance of Signalling Equipment Page 401 of 535