Trouble Shooting
Page 10 of 16
Doc. No.: 13S000411
Revision: A
Copyright © 2010 Rolls-Royce plc
2.6
Voltage Surveillance Alarms
The following alarms will be issued for voltage surveillance related faults:
Alarm Text
Cause, Effect and Action
PORT MP NC 220 Volt Failure U3 Cause: 220V AC Main supply failure.
Effect: Control system operate as normal
Action: Check connections and fuse. System still fully operational with 24V
Backup supply
PORT MP NC 24 Volt Failure U4
Cause: 24V DC in Backup supply failure
Effect: Control system operate as normal
Action: Check connections and fuse. System still fully operational with
220V AC Main supply
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