Trouble Shooting
8
Page 9 of 16
Doc. No.: 13S000411
Revision: A
Copyright © 2010 Rolls-Royce plc
2.5
Deviation Surveillance Alarms
The following alarms will be issued for deviation surveillance related faults:
Alarm Text
Cause, Effect and Action
PORT MP NC Pitch Deviation
Alarm
Cause: Hydraulic/Mechanical failure in pitch servo mechanism
Effect: Pitch Not moving according to order from control system
Action: Stop using thruster, check thruster mechanical manual
PORT MP NC Azimuth Deviation
Alarm
Cause: Hydraulic/Mechanical failure in azimuth servo mechanism
Effect: Azimuth not moving according to order from control system
Action: Stop using thruster, check thruster mechanical manual
PORT MP NC Start Failure
Cause: Thruster failed to start or Thruster stopped without being stopped
by operator (trip on high current, pitch deviation alarm, failure in starter/
drive).
Effect: Thruster not available.
Action: Investigate what is causing thruster to stop/not start.
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