Operation Manual
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The alarm system | AP70/AP80 Installation Manual
Setting the alarm and warning limits
The alarms and warning limits are adjusted from the settings display.
1. Activate the alarm settings dialog as shown above
2. Select the parameter to be changed
3. Press the rotary knob to edit the value
4. Change the value by using the rotary knob or the arrow keys
5. Repress the rotary knob to confirm your setting
Only a few alarms can be turned off. These are indicated with a check box, and are turned on/
off by pressing the rotary knob.
¼ Note: Additional alarm limits that can be defined for each Work profile. Refer to Work Profile
description in the Operator Manual.
Compass dierence limit
When two compasses are used (main compass and monitor compass), there is virtually
always a difference between the readings of the two. If the difference exceeds the set limit, an
alarm is given.
¼ Note: The difference between the two compass readings may vary with the vessel’s heading
and from one area to another where a vessel is in transit. The difference between the two
compass readings is automatically reset when a Compass diff. alarm is acknowledged.
• Range: 5° - 35°
• Default: 10°
Course dierence limit
Sets the value the actual heading can differ from track course.
• Range: 5° - 35°
• Default: 35°
Sharp turn limit
Gives a warning if a turn is started in any auto mode with a combination of speed and turn
rate/radius that will cause sidewise acceleration bigger than set limit.
• Range: OFF / 1 - 10 m/s
• Default: OFF
Fallback and failures during automatic steering
Rudder angle sensor missing
Alarm will be given and steering will after 0.1 sec continue using “virtual” rudder angle data
(virtual is estimated value based on known rudder speed)
Steering compass missing
When monitor compass is available
Alarm for main compass failure is given and steering continues using monitor compass. If
there is a difference between the compasses, a smooth transition (2 min filter) to the monitor
compass heading takes place.
When acknowledging the alarm, the autopilot goes to STBY mode.
When no monitor compass
Rudder is kept at fixed angle (i.e. heading is approximately maintained if failing when heading
keeping, turn is approximately maintained if failing when turning), alarm is given and
autopilot goes to STBY mode.