SERVICE MANUAL R5888C
QUADRAMHO Chapter 5
Page 2 of 24
Section 3. PRELIMINARY INSTRUCTIONS
3.1 Wiring check
Check all panel wiring against the scheme wiring diagram. (The general relay
external connection diagram is supplied with these instructions but it may not be
the latest issue).
3.2 Insulation test
This test may be done by the main plant contractor at an earlier date. An electronic
or brushless insulation tester should be used having a dc output not exceeding
1000 volts.
Deliberate circuit earthing links removed for these tests must subsequently be
replaced. The relay and its associated wiring may be insulation tested between:
a) All electrically isolated circuits
b) All circuits and earth
Accessible terminals of the same circuit should first be strapped together.
3.3 Module data check and information on the ratings label
i) Remove the front cover by lifting the sliding catches on the sides of the cover.
ii) The heavy current bridging plugs 1Z and 1Y can then be removed; this puts a
short on all the incoming CT circuits and isolates the equipment from the ac and
dc voltage supplies.
iii) The lower interlock bar can then be moved to the right and modules 1 and 2
removed with the extractor tool.
The modules should only be handled as described in Chapter 4. (ie. the handler
earthed by the wrist strap and only the board edges or front plate held).
iv) The ‘rating card’ is now exposed in the top left hand side of the case, the
information on this incudes:
a) Ratings for frequency, current, ac volts, auxiliary dc supplies Vx(1) and
Vx(2).
b) A list of the 2 alpha identification numbers for the seven modules that can be
extracted and the power supply mounted on the back of the equipment.
These are of the form RRZ 07 000 000, on the module frontplate. There will
also be another letter at the end which indicates if any changes have been
made since the ‘A’ issue.
c) The external connection diagram number; two sheet numbers are given; one
being for single and 3 phase tripping and the other for 3 phase tripping
only.
d) The 4 alpha number for the relay of the form:
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