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ContinuousWave: Small Boat Electrical
Simrad AP11 Autopilot Failure
|Author||Topic: Simrad AP11 Autopilot Failure|
posted 08-08-2011 09:19 PM ET (US)
I have a Simrad AP11 Autopilot.
J3000X Junction Unit
LF3000 linear feedback
LFI3000 Linear Feedback Interface.
The unit is giving a Rudd.Ang Failure message.
I checked all the cables and connections and they look OK
I have not called Simrad yet, has anyone had this happen to them?
posted 08-08-2011 10:23 PM ET (US)
John--Without having any knowledge of how this actually is designed, I would guess that the rudder angle feedback sensor is likely arranged as a potentiometer. I would begin diagnosis by
--disconnecting the cable from the rudder angle sensor to the main unit;
--using an ohmmeter, check for continuity and resistance on tbe cable going to the sensor;
--I would expect to see that there were three leads involved with the potentiometer; the resistance among and between these leads should vary as the outboard engines are turned to port or starboard;
--using a voltmeter, check to see if there is any voltage supplied from the main unit to the pins on the connector to which the rudder angle sensor connects.
It would be much easier to diagnose the problem if you could get a schematic diagram from the manufacturer.
posted 08-12-2011 10:25 PM ET (US)
John--I found some SIMRAD literature on-line about the AP11 system. The rudder position sensor looks more sophisticated than just a potentiometer. You are going to need some more technical literature to delve deeper into this repair.
posted 08-15-2011 10:56 AM ET (US)
I talked to Simrad.
They said to open up the LFI3000 Linear Feedback Interface and clean the connections inside the box.
If that does not work then I need to replace the LF3000 Linear Feedback or the LFI3000 Linear Feedback Interface.
posted 11-23-2011 05:35 PM ET (US)
I cleaned all the connections and still received the "Rudder feedback failure" message.
I found a used LF3000 linear feedback on eBay.
So I will have to mount it but it looks like my autopilot is back in business.
posted 11-23-2011 10:27 PM ET (US)
John--That is good news. It is always satisfying to make a repair yourself, and in the process save some money. And bydiagnosing and repairing the problem, you have become more familiar with the system and better able to maintain it in the future. Good work.
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