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SERVICE MANUAL
R5888C
QUADRAMHO
Chapter 6
Page 9 of 12
i) Low set
Minimum operate level =
2 x 4.8
100
K1 + K2
x
I
n
amps (
±
20%)
Select test option 43, inject current into any phase and check the minimum
operate level as indicated by the LED marked “V~FAIL”. Drop-off should be
within 10% of the actual pick-up.
ii) High set
Minimum operate level =
16 x 4.8
100
K1 + K2
x
I
n
amps (
±
20%)
Select test option 53 and inject current as for the low set and check the
“V~FAIL” LED for operation. Drop-off should be within 10% of the actual pick-
up.
4.11
Opto isolator check
Energise each opto isolator in turn, selecting the appropriate test option. Check the
correct LED is on.
Opto isolator
Test option
LED marking
Breaker open (A3–A4)
40
SOTF
Reset Z1 ext (A1–A2)
40
V~Fail
Sitnal receive (A9–A10)
41
SOTF
Channel in service (A7–A8)
41
V~Fail
Inhibit PSB (A5–A6)
42
V~Fail
4.12
Auxiliary contacts check
Reconnect the link 1Z 10 to enable all auxiliary relays. Care must be taken, as
output contacts will close during this test.
All the outputs may be checked as described in Figure 3.
Section 5
FURTHER TESTING
5.1
Introduction
These tests may be required to isolate a faulty module. They must only be done in
the order specified in the flow charts.
5.2
Power supply check
Turn off the dc supply and remove all the modules with the exception of modules 6
and 7. Reconnect the dc supply and check the internal dc rails via the 25 way
monitor point box as described in Section 2.5. If a fault persists, replace the power
supply module ZRE 01. Otherwise remove the dc supply and insert each module
individually. Again check the internal rails. If the fault reappears, replace the
module. Otherwise insert all the modules and recheck the rails. If the fault returns,
replace the power supply module ZRE 01.
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