SERVICE MANUAL R5888C
QUADRAMHO Chapter 6
Page 1 of 12
Section 1 INTRODUCTION
The following tests are designed to locate a faulty module which can then be
returned to ALSTOM T&D Protection & Control Ltd for repair. The tests may be used
in conjunction with the commissioning instructions Chapter 5 in the event of a fault
being detected. The Quadramho relay has several inbuilt test options and a 25
way monitor socket which are detailed in Figures 1, 2 and 3. These features are
used in the following tests.
Section 2 INITIAL TESTS
These initial tests are only applicable if the relay inoperative alarm contact has
closed with the relay in service. If this is not applicable move to the main tests in
Section 3.
2.1 Test equipment required
i) 1 Multimeter (20,000 ohms per volt on dc range).
ii) A Quadramho accessory kit 01.
Ensure that the following are correct:
i) The dc supply is correct.
ii) The ac wiring is correct and supplies are present.
iii) The relay settings are correct and a valid scheme selected.
iv) The two heavy current bridging plugs are in.
This test is applicable if the VTS is set to block (SW3 to right). If the V~FAIL LED is
illuminated then the voltage transformer supervision feature has detected a fault in
the voltage supply to the relay or internally. Check, and if necessary repair the
supply and reset the relay via the pushbutton. If the relay fails to reset (relay
available LED remains off) the more detailed tests described in Section 5.4 are
required.
The internal dc power rails can be checked via the 25 way monitor point box.
Connect the multimeter common to pin 2 (0V) and check each of the following
voltages are within ±5% of nominal.
Pin 3 +24V
Pin 14 +5V
Pin 15 –12V
Pin 16 +12V
If this test fails, the tests described in Section 5.2 should be carried out.
This test checks to see if the microprocessor is correctly executing the software.
Select option 57 and set switches SW1-8 to the left. Check all 8 LEDs are off.
Select switches SW1-8 to the right and check all 8 LEDs are on. Selection option
43 and check LED Z2 is off. Press and hold the pushbutton checking the LED is on.
If any of these tests fail, replace module 4 (RCL 10).
This test is only applicable if the self-checking feature is selected (SW5 to the right).
If the relay fails a self-check it results in the relay available LED being extinguished.
This can be checked by selecting option 45. This option displays the results of a
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