P225/EN CM/B11 Maintenance
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MiCOM P225
• While the MiCOM relay is in Maintenance mode:
− All protective functions are disabled
− All automation functions are disabled
− All output relays are off (including the watchdog relay)
− The ALARM LED flashes
− The MAINTENANCE MODE alarm appears
− Communication via RS232 and/or RS485 ports is once more available.
• When the MiCOM relay is in Maintenance mode:
− A remote control signal is used to energise the required output relays
− Another remote control signal must be sent to de-energise the output relays.
• Once the output relay tests are completed, reset the MiCOM relays to normal
operation mode
− by using the MiCOM S1 software, or
− via the RS485 communication port.
3.3.2 Testing the output relays
Connect a continuity tester across the terminals of each output contact to check the correct
contact position (open/closed circuit) as in the table below.
The state of each output relay (1: energised/0: standby) is given in the "OP. PARAMETERS"
menu.
Output relay on standby Output relay energised
OUTPUT
RELAY
Normally closed Normally open Circuit open Circuit closed
WD
(watchdog)
36-37 36-35 36-37 36-35
RL1 2-4 2-6 2-4 2-6
RL2 8-10 8-12 8-10 8-12
RL3 14-16 14-18 14-16 14-18
RL4 1-3 1-5 1-3 1-5
RL5 7-9 7-11 7-9 7-11
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