Simrad AP70 Installation Manual page 62

Alarm/Warning Type
Red flashing AP70/
AP80 power button,
black display
Active control unit
missing
Autopilot computer
missing
Boat speed missing W/A
CAN bus failure
CAN bus supply
overload
Check heading
Compass difference
Course difference
Cross track distance
W/A
limit
Drive inhibit
No drives available
62 |
Warning/Alarm condition
A < 5 V
Autopilot computer has
A lost contact with active
control unit
Active control unit has
A lost contact with autopilot
computer
Lost sensor data
Not possible to send or
A receive data although bus
voltage is ok
W Current >4.3 A
Current >10 A for 1 ms,
A
hw shutdown
Lasting steering compass
heading jump >10° within
A
1 sec during automatic
steering
Difference between
steering compass
A
and monitor compass
+variance > set limit
Actual heading diff from
A
track course by set limit
XTD > XTD limit
Motor or solenoid drive
A electronics critically
overloaded
None of the drives
selected in present work
A
profile is available for
steering
The alarm system | AP70/AP80 Installation Manual
Possible cause and recommended action
Local supply voltage to AP70/AP80 missing or <5 V.
Check local supply, connections and fuses to AP70/AP80
control units
Active control unit goes silent.
1.
Check/repair CAN bus cable
2.
Replace the control unit
Faulty autopilot computer or poor cable connections from the
same.
1.
Check connectors and cable
2.
Check local power to control unit
3.
Check that control unit is turned on
4.
Replace autopilot computer
¼ Note:
Since this alarm may be given by several units at the
same time, it has no device
The speed signal from the GPS or the log is missing.
1.
Check Device list for valid speed source
2.
Try a new automatic source update
3.
Check the GPS, log, and cable connections
Poor CAN bus backbone, defective cable/connector or
defective CAN bus receiver in autopilot control unit.
1.
Check backbone terminations
2.
Check cable and connectors
3.
Replace Autopilot control unit
Check summary unit loads
Excessive current draw.
Check for short circuit/defective device on network.
A sudden jump in heading of more than 10 degrees is
detected
Check steering compass. Possibly change to other heading
source or monitor compass.
The difference in readings between the main compass and
the monitor compass exceeds the limit set for "Compass
difference".
Check the operation of both compasses. If one compass is
magnetic, the error may be caused by deviation change or
heavy sea disturbances.
Compass heading is deviating too much from the track
course (BWW). May be caused by extreme wind and current,
combined with low speed.
XTD has reached set XTD limit in
caused by extreme wind and current or too low boat speed.
Check for wire shortage, eventually disconnect suspicious
wires.
Check that use of thruster(s) has been activated by CMD/
THRUSTER button.
Check that steering gear/thruster is started and set for
autopilot control.
Check if speed is below thruster inhibit limit.
Check if drive is unavailable for other reason (ref. Drive ready
missing alarm).
tag.
NAV/TRACK
mode. May be