Commissioning P54x/EN CM/La4
MiCOM P543, P544, P545 & P546
CM) 10-21
CM
5.2.4 Light emitting diodes (LEDs)
On power up the green LED should have illuminated and stayed on indicating that the relay
is healthy. The relay has non-volatile memory which remembers the state (on or off) of the
alarm, trip and, if configured to latch, user-programmable LED indicators when the relay was
last energized from an auxiliary supply. Therefore these indicators may also illuminate when
the auxiliary supply is applied.
If any of these LEDs are on then they should be reset before proceeding with further testing.
If the LEDs successfully reset (the LED goes out), there is no testing required for that LED
because it is known to be operational.
Note: It is likely that alarms related to the communications channels will not
reset at this stage.
5.2.4.1 Testing the alarm and out of service LEDs
The al
arm and out of service LEDs can be tested using the COMMISSION TESTS menu
column. Set cell [0F0D: COMMISSION TESTS, Test Mode] to ‘Contacts Blocked’. Check
that the out of service LED illuminates continuously and the alarm LED flashes.
It is not necessary to return cell [0F0D: COMMISSION TESTS, Test Mode] to ‘Disabled’ at
this stage because the test mode will be required for later tests.
5.2.4.2 Testing the trip LED
The trip
LED can be tested by initiating a manual circuit breaker trip from the relay.
However, the trip LED will operate during the setting checks performed later. Therefore no
further testing of the trip LED is required at this stage.
5.2.4.3 Testing the user-programmable LEDs
To test the
user-programmable LEDs set cell [0F10: COMMISSION TESTS, Test LEDs] to
‘Apply Test’. Check that all 18 LEDs on the right-hand side of the relay illuminate yellow for
approximately 2 seconds.
5.2.5 Field voltage supply
The relay ge
nerates a field voltage of nominally 48 V that can be used to energize the
opto-isolated inputs (alternatively the substation battery may be used).
Measure the field voltage voltage across the terminals 7 and 9 on the terminal block given in
the table below. Check that the field voltage is within the range 40 V to 60 V when no load is
connected and that the polarity is correct.
Repeat for terminals 8 and 10.
Terminals
Supply rail
P54x
+ve J7 & 8 - (P543 & P544)
–ve J9 & J10 - (P543 & P544)
+ve M7 & M8 - (P545 & P546)
–ve M9 & M10 - (P545 & P546)
Table 4: Field voltage terminals
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