Page 298 - GM E-BOOKLET 2022

Modification of spare QLM relay as portable testing jig.

3.Test parameters programming by PC for testing and data acquisition for
QLM/OCR (Safety relays).

Purpose
To record the testing parameters of safety relay QLM and OCR digitally.

Advantage
To test, check and record the relay testing parameter like pick up, drop

out of relay and mill volt drop of interlocks can be done.
Test data report recorded by type of relay, date, by relay serial no, by

loco no and by monthly records

Testing relays

QLM and OCR

Testing periodicity: IA, IB, IC, TOH and IOH schedule.
Record of type of relay, loco no, Sl.
No. date, time, pick up and drop Record of mill volt drop of interlocks
out values

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