Instruction manual

Robertson AP11 Autopilot
88 20220513E
5 TROUBLE SHOOTING
An autopilot is a complex system and the performance is
dependent of a proper installation and a successful sea trial.
In the event of a failure, you will be helped by the AP11
software which contains several test features that will assist
you in isolating a probable fault.
5.1 Alarm listing
Display Probable fault Recommended action
OFF CRS. Off course alarm
Limits: ±20° on
compass, ±5° on wind
Check steering parameters (View
Parameters Menu page 80).Check boat
trim, adjust trim flaps or sails.
COMPASS Compass failure Check connections, cable and heading
sensor.
RUDD.ANG Rudder feedback failure Check cable, connections and installation
of Rudder Feedback Unit
ACTUATOR Drive unit failure Check connections to drive unit motor
and clutch or bypass valve. Verify that
motor is running, and the clutch or
bypass clicks in and out. Also check that
the mechanical or hydraulic hand
steering works properly and that the
rudder moves smoothly. Consult the
drive unit manual.
NO DATA Navigation or Wind data
missing. Indicates that
no data is received from
Nav. receiver or
windvane system
Check that the "NMEA talker" is
powered up and configured for
transmitting data to the autopilot. The
LEDs in the junction unit will flicker if
data is present on RX port. Check
connections, cables and switches on data
source.
NAV.DATA Sentence with required
Nav. info is missing
Run NMEA check in installation setup to
analyze incoming data. Also check Nav.
receiver setup for: waypoints, route,
magnetic variation, arrival alarm etc.