AUTOPILOT

Pumpset contamination Clean or replace pumpset

Symptom Cause Action
Blinking [Low Bat] on
bottom line of display Low battery voltage. Automatic
shut-off in case of voltage lower
than 10.5 V (12 V battery) and
21.5 V (24 V battery).
Turn Autopilot off and charge batteries, or
correct voltage loss. When proper voltage
restores, restart Autopilot.
Poor wiring connection. Check for voltage drop and repair.
Power wiring is undersized. Replace wiring with correct diameter wire.
When Autopilot
engaged, rudder goes
harddover.
APC routine not performed. Perform APC routine.
Power transistors in Servo Unit
may be shorted. Replace transistors or entire circuit board.
Rudder transmitter linkage
disconnected. Re-connect and align as per installation
instructions.
Rudder transmitter wiring
shorted or open circuit. Check and repair wiring as necessary.
Autopilot wanders on
some headings Magnetic interference is
present. The worst steering is
usually on northerly headings in
the northern hemisphere and
southerly headings in the
southern hemisphere.
Perform Auto-Deviation-Clear [CLR] and
Auto-Deviation [DEV] again, or try another
compass location. Investigate for
magnetic disturbances around compass,
e.g. masses of steel, motors,
loudspeakers etc.
Autopilot wanders on
all headings Severe magnetic interference. Choose another compass location.
Air in hydraulics. Fill and purge the steering system.
Slack in the steering system. Repair any loose or worn parts.
Rudder transmitter
potentiometer is "noisy" or
intermittent.
Replace rudder potentiometer.
Compass damaged;
intermittent wiring connection Repair any loose or worn parts; recheck
and connect wiring.
Slow wander means rudder
control is set too low
(understeering).
Increase Autopilot setting [P1] [RUD]
Fast wander means rudder
control is set too high
(oversteering).
Decrease Autopilot setting [P1] [RUD]
Autopilot wanders on
all headings. Excess rudder load. Reduce rudder friction, increase steering
cylinder size, increase power of the
pumpset.
Rudder movement is
erratic Air in system. Check for leaks and bleed the system.
Rudder angle indicator
is displaying erratic
values.
Rudder transmitter is defective
(noisy). Replace rudder transmitter or
potentiometer within.
Check for loose or broken wires
in terminal strips. Reconnect tightly.
Check for broken wires in
cables. If wiggling of cable where it flexes causes
rudder activity, replace cable.
Boat overshoots on
large course changes. Rudder control set too high. Decrease Autopilot setting [P1] [RUD]
Counter rudder set too low. Increase Autopilot setting [P3] [CRD]
Symptom Cause Action
Course as set on If constant error, Autopilot Use Compass setting [C6] [ADJ] to adjust
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