• Replace the autopilot computer drive board
Off heading (W)
The vessel heading is outside set off heading limit. May be caused by extreme weather
conditions, and/or too slow speed.
• Check steering parameters (Rudder, Autotrim, Seastate filter)
• Increase response/rudder value
• Increase boat speed, if possible, or steer by hand
Override (W)
EVC override via SG05, override via SD80/AD80 Handshake or override via SD80/AD80 RUD UI
port.
• If unintended warning, make sure override handle is not being activated by loose objects
• Check cabling and override switches connected to Handshake port of SD80 or AD80
board
Position data missing (W/A)
(Alarm in NoDrift mode, else Warning).
Position data from the GPS is missing.
• Check device list for valid position source
• Try a new automatic source update
• Check the GPS and cable connections
Rudder data missing (A)
Rudder angle signal to autopilot computer is missing.
• If several rudder angle sensors, check which port on the board that is set up for use
• If the missing sensor is connected to an autopilot computer, check cabling
• If missing sensor is a CAN device, check network connection
Rudder limit (W)
The set rudder limit has been reached or is exceeded. Might be caused by disturbance to
compass (waves) speed log, sharp turn or improper parameter settings.
This warning is related to rudder command in automatic modes. The warning is
automatically reset when the rudder position is within the limits.
Rudder too slow (W)
Excessive load to steering gear. Air in hydraulic system, insufficient drive unit capacity.
• Look for mechanical obstructions at the rudder/tiller/ quadrant. Check the back drive force
• Bleed the hydraulic system
• Replace with larger pump unit
Sharp turn (W)
Acceleration is larger than the set Shart turn limit.
• check that the vessel speed to the autopilot is correct
• check that the set turn rate or radius corresponds to actual turn rate
Steering compass missing (A)
No data from the selected steering compass.
If no monitor (back-up) compass: the autopilot goes to Standby mode.
If monitor compass: the autopilot goes to monitor compass.
If there is a difference, the autopilot will gradually synchronize with the new heading (2
minutes).
Thruster inhibited (W)
The vessel speed exceed the set limit for when the thruster can be used.
Ú
Note: The Thruster inhibit limit will only apply when speed source is Log or SOG, not if
the speed is set manually.
The alert system| AP70 MK2 Operator Manual
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