Simrad AP50 Operator's Manual page 55

Display readout
No rudder cntrl
voltage
No thruster valve
voltage
No thruster
response
Vessel off course
End of route
NAV. data failure
(---).
Refer to the
"Service Menu" in
AP50 Installation
Manual.
20221032 / E
Probable fault
Ref. voltage for analog
rudder control is missing.
1. External reference
voltage missing for
analog thruster
control.
2. Internal voltage
missing for ±10V or
4-20mA thruster
control.
1. Speed to high for
thruster operation
2. J50 has lost
communication with
the TI51 Thruster
Interface.
3. Broken connection or
defective electronics.
Extreme weather
conditions, very slow
speed, or boats heading is
outside the fixed Off
heading limit of 20°
(automatic reset when
inside the limit).
Warning given on the
active control head when
the "END ROUTE"
waypoint name has been
received from the
navigator/ECS.
Missing or invalid Nav.
data.
Recommended action
For AP50 Plus system, refer to the
troubleshooting section in the AP50
Plus Installation Manual.
Check voltage on TI51 - TB4.
Wrong setting of S1, S2 in TI51.
Check internal ±12V
(+12V between S1-left and TB5-3)
(–12V between S2-left and TB5-3).
1. Refer to set limit for Thruster
Inhibit. See "Thruster Inhibit"
in the AP50 Installation
Manual.
2. Check cabling or operation of
the TI51 Thruster Interface.
Refer to separate TI51 Manual.
3. Try to switch system off and on
4. Check thruster installation.
5. Replace unit.
1. Check the steering parameters
(Rudder, Autotrim, Seastate
filter).
2. Increase the Rudder value
3. Increase the boat speed, if
possible, or steer manually.
4. Check the steering gear and
autopilot interface.
1. Use NMEA Test menu.
2. Check the Nav. receiver set-up.
Troubleshooting
49