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iii) Rudder at maximum limit as defined by limit switch settings.
NOTE: An open circuit limit switch (whether due to adjustment or defect) is signalled by the L/SW
OPEN alarm.
iv) No rudder demand outputs from AlphaPilot MFS Control Unit or defective solenoid(s):
ASI Analogue Steering Systems
Provided continuous rudder position feedback is available and the ASI Steering Fail monitor is turned
ON, the AlphaPilot MFS system will monitor the Rudder position (as indicated by the Rudder
Feedback signal) and compare it to the demanded position.
When the Rudder approaches the demanded position, if the final position when the rudder has
stopped remains greater than the set limit value for more than two seconds, and the rudder is not
moving towards the correct position, then the steering fail alarm is activated. The alarm is
automatically cancelled if the rudder moves towards the correct position or the error is within the
set limit.
Likely causes are:
i)
Analogue steering machine not operating or not set for AlphaPilot MFS system control.
ii) Rudder at maximum physical limit.
iii) Rudder not at demanded angle due to incorrect calibration of AlphaPilot MFS
Distribution Unit Output Gain.
RRU FAIL
This error message warns that an abnormally high rate of change or step voltage change has been
detected from the RRU potentiometer, which is used to signal rudder position.
This might be caused by a 'noisy' or open circuit potentiometer track, damaged wiring, or
intermittent feedback connections. Loose joints or 'backlash' in the mechanical linkage between RRU
and rudder stock may also be a contributory factor.
The AlphaPilot MFS Control Unit display provides two-digit rudder angle data and can be used to
provide an accurate indication of the RRU potentiometer integrity as follows:
Set the AlphaPilot MFS system to standby and use manual steering control to move the rudder from
hard over Port to hard over Starboard observing the two-digit display in the process. If the indicated
rudder angle fails to follow the rudder smoothly and accurately, a potentiometer fault is indicated.
Ethernet Alarms
ETHERNET FAIL
No Data received on Ethernet.
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Contact a certified installation company approved by either ALPHATRON MARINE or by an official ALPHATRON
MARINE distributor for support.
49 | Alarms, warnings, and cautions
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