Operation Manual

64 |
The alarm system | AP70/AP80 Installation Manual
Alarm/Warning Type Warning/Alarm condition Possible cause and recommended action
Navigation data
missing
W/A
Lost sensor data
(NAV mode)
Navigation data from Plotter/ECS is missing.
1. Check Device list for valid navigation source
2. Try a new automatic source update
3. Check the Plotter/ECS and cable connections
New WP A
Ref. "Course change
confirm limit" in NAV
Nav mode only; Course change from one leg to the next is
exceeding set "Course change limit"
No rudder response A
No response to rudder
command
1. Check all connections
2. Check Rudder FB transmission link (not applicable for
Virtual feedback installations)
3. Check drive unit motor/brushes
4. For SD80, check that port/stbd led is activated (ref label in
cover for location
5. Replace the Autopilot Computer Drive board
Off heading A
Boats heading is outside
set off heading limit.
Automatic reset when
inside limit
May be caused by extreme weather conditions, and/or too
slow speed.
1. Check steering parameters (Rudder, Autotrim, Seastate-
filter)
2. Increase Response/Rudder value
3. Increase boat speed, if possible, or steer by hand
Override W
1. EVC override via SG05
2. Override via SD80/
AD80 Handshake (ref.
KaMeWa)
3. 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 faulty SD80 or AD80
board
Position data missing W/A
Lost sensor data
(NoDrift mode)
Position data from the GPS is missing.
1. Check Device list for valid position source
2. Try a new automatic source update
3. Check the GPS and cable connections
Rudder data missing A
Rudder angle signal to
faulty board is missing
If several rudder angle sensors, check which one the faulty
board is set up for use (refer “Drive test/calibration” on page
52). If the missing sensor is connected to an autopilot
computer check cabling to the board. If missing sensor is a
CAN device, check backbone bus network connection.
Rudder limit W
Limit rel. to rudder cmd
in auto modes. Not
applicable for NFU/FU
where rudder shall stop at
max -3°
The set rudder limit has been reached or exceeded. This is a
warning only and may be caused by disturbance to compass
(waves), speed log, sharp turn or improper parameter setting.
No rudder response W
Rudder error >1° when
rudder command > 0.5°/s
Excessive load on steering gear. Air in hydraulic system.
Insufficient drive unit capacity.
1. Look for mechanical obstructions at the rudder/tiller/
quadrant. Check the back drive force
2. Bleed the hydraulic system
3. Replace with bigger pump unit
Sharp turn W
Acceleration > set g-limit
(Alarms - settings)
If unintended warning, check that the boat speed to the
autopilot is correct. Check that set turn rate or radius
corresponds to actual