CAN bus supply voltage missing
Active control unit will give local alarm and rudder/thruster drive units will go to Standby
mode.
Autopilot computer missing rudder/thruster drive computer failure
Alarm will be given and the ready signal to the steering /thruster gear will disappear. If
software failure, there will be a watchdog restart of failing drive computer. The autopilot
steering computer will try to maintain steering as far as possible with remaining drive
computers. If the faulty unit is the autopilot steering computer, autopilot backup computer
has to be selected manually.
Possible alerts and corrective action
The next pages include a list of all alerts generated by the autopilot system.
The unit might also display alerts received from other units connected to the system. Refer
separate documentation for the relevant equipment for further description of these alerts.
Alert type abbreviations:
•
A
: Alarm
•
W
: Warning
Active control unit missing (A)
Autopilot computer has lost contact with active control unit.
•
Check/repair CAN bus cable
•
Replace the control unit
Autopilot computer missing (A)
Active control unit has lost contact with autopilot computer.
•
Check connectors and cables
•
Replace autopilot computer
Ú
Note:
This alarm will only show up on passive units if active control unit is defective or
has lost bus communication.
Boat speed missing (W/A)
(Alarm when Nav steering, else Warning).
The speed signal from the GPS or the log is missing.
•
Check device list for valid speed source
•
Try a new automatic source update
•
Check the GPS, log, and cable connections
CAN bus failure (W/A)
(Warning in standby mode, else Alarm)
Poor CAN bus backbone, defective cable/connector or defective CAN bus receiver in
autopilot control head.
•
Check backbone terminations
•
Check cable and connectors
•
Replace autopilot control unit
CAN bus supply overload (W/A)
(Warning if current is >4.3 A. Alarm if current >10 A for 1 ms, hw shutdown).
Excessive current draw.
•
Check summary unit loads
•
Check for short circuit/defective device on network
Check heading (W)
Jump in heading of more than 10°/second.
•
Check steering compass
•
Change to other heading source or monitor compass
40
The alert system
| AP70 MK2 Operator Manual
