SERVICE MANUAL R5888C
QUADRAMHO Chapter 6
Page 2 of 12
self-check on Zone 1 comparators via the top six LED. A failure is indicated by a
LED being off. Repeat for Zone 2 by selecting option 46 and Zone 3 by option 47.
In this option the LED “SOTF” represents the power swing blocking comparator. If a
failure is detected the detailed tests in Section 5.3 must be carried out.
Remove the dc supply and extract module 1 (RRZ 07), insert the double extender
card in the left hand position and connect edge connector AA33 to pin 16 of the
monitor point box which should be plugged in. Do not replace the module. Turn
the dc supply on and check the relay available LED. If the LED is illuminated,
replace module 1 (RRZ 07) otherwise replace module 2 (RRM 08).
Section 3 QUICK FAULT FINDING GUIDE
If a spare set of modules is available a method of substitution may be used to
locate a faulty module. This method is often quicker and requires no extra
equipment.
The following table may be used as a guide:
Fault symptom Module most likely to be faulty
Any element in Zone 1/2 inaccurate Module 2 RRM 08
but Zone 3 alright.
Any element in Zone 3 inaccurate Module 3 RRM 09
but Zone 1/2 alright.
Ground fault reach low Module 1 RRZ 07
in all zones.
Phase fault reach low Module 1 RRZ 07
in Zone 1/2.
No operation for elements Module 1 RRZ 07
involving a common phase.
Reach equally inaccurate Module 5 RFV 04
all zones.
No operation for three Module 2 RRM 08
phase close up faults.
Section 4 TEST PROCEDURE
4.1 Test equipment required
Quadramho accessory kit 01.
Test set.
1 interval timer (one that can work off contacts or 24V levels and has a dwell
facility).
2 multimeters (20,000 ohms per volt on dc range).
Single channel oscilloscope with X 10 probe or frequency meter.
2 single pole switches.
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