Simrad AP50 Autopilot
168 20221032B
Display readout Probable fault Recommended action
Memory failure J50 Wrong checksum on
memory parameters or
variables.
Perform a "Master reset" and make
a new "Dockside set-up". Switch
off and on again. If the alarm is
repeated, replace Junction unit
Main PCB.
Com. failure with
J50
Faulty junction unit or
poor RobNet cable
connections from the
junction unit.
1. Check the RobNet connectors
and cable.
2. Replace the junction unit Main
PCB.
Low supply voltage Mains voltage less than 9
V.
1. Verify in the System Data menu
2. Switch autopilot off and charge
batteries.
3. Check/repair battery charger.
High supply
voltage
J50, J50-40 Mains
exceeds 44 V.
1. Verify in the System Data menu
2. Switch the autopilot off.
3. Check/repair battery charger.
Compass
difference
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 (see ‘System Data’,
page 145. If one compass is
magnetic, the error may be caused
by deviation change or heavy sea
disturbances. See page 149.
Speed missing
(Automatic reset
when available, see
page 39)
The speed signal from
the GPS or the log is
missing (15 sec. delay).
Check the GPS, log, and cable
connections.
Rudder limit 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 thruster valve
voltage
There is no voltage from
the Danfoss valve to
TI50.
Check that the Danfoss thruster is
switched on. Check the cable
connections.
No thruster
response
1. Speed to high for
thruster operation
2. J50 has lost
communication with
the TI50 Thruster
Interface.
3. Broken connection or
defective electronics.
1. Refer to set limit for Thruster
Inhibit, page 156.
2. Check cabling or operation of
the TI50 Thruster Interface.
Refer to separate TI50 Manual.
3. Try to switch system off and on
4. Check thruster installation.
5. Replace unit.
