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Robertson Autopilot Rudder angle fault


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#1 ballystick

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Posted 25 October 2017 - 05:56 AM

Has anyone had problems with this fault? The autopilot will work well until this fault comes up and then loses steerage. Spare parts for older models?

I have rechecked it and the autopilot isn't nexus but a hydraulic unit that I will have to check on he make??! A Robertson unit.


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#2 Fish

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Posted 26 October 2017 - 08:26 AM

Need more info on the fault and your set up.
We have a nexus ap, octopus hydraulic pump and a seperate rudder angle sensor, on top of the hydraulic ram.
If we had a rudder angle fault I would suspect the rudder angle sensor. They aren't that robust in comparison to the Rams etc. I think just an electrical resistor thingy, gives more resistance the further the rudder is over, etc. don't mix well with the marine environment.
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#3 island time

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Posted 26 October 2017 - 08:47 AM

Robertson is now Navico (Lowrance ,Simrad,B&G). I'm an agent.

Sorry but your description of the fault is a bit vague.

What exactly does the AP say when the fault is present? What is the AP model?

If the error is "no rudder response" then have you actually checked that the rudder moves?

Is there a particular event that triggers the issue? (SSB transmission used to do this a lot!)

Quite likely I can get you a suitable rudder angle sensor if that is actually what the problem is...


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#4 ballystick

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Posted 26 October 2017 - 10:21 AM

I will get more info over the weekend, thanks in advance. I have found the zero setting to be out by 8 deg. and degree readings with turns lock to lock to be uneven for a start.


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#5 island time

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Posted 26 October 2017 - 10:27 AM

OK, that can be the AP needs to have the dockside setup procedure needs to be rerun, to calibrate the sender and to reset the straight ahead position. If you can give me the model of the AP, I should be able to give you the instructions to do this, if you don't have the manual.

Cheers

Matt


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#6 ballystick

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Posted 26 October 2017 - 04:37 PM

The unit is an AP22, I have a manual with instructions. Here are some photos  The fault was something like there was a rudder angle fault but not sure exactly.

20171026 162632
Album: autopilot
6 images
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#7 island time

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Posted 26 October 2017 - 06:29 PM

Right, getting there. The control unit will be the AP22 (Simrad). The rudder feedback unit looks like an early rfu300 - or maybe a RFU25 - is it possible to read the label?. Whats the AP computer? J300X, J3000X maybe? The type of computer dictates the particular rudder feedback unit required.

Anyway, step on is to do a factory  reset on the AP, and then run through the setup procedure (in the install manual) again to see if the issue goes away. 

If the rudder feedback unit is faulty, or non linear, then the rudder test procedure in the manual should cause the setup to fail.

I think I have a working 2nd hand feedback unit, and, if not, then there is a new one still available that should be ok.

Let me know the AP computer model, and how you get on if the reset doesn't fix it.

Cheers

Matt


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#8 Willow

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Posted 28 October 2017 - 10:14 AM

I have a simrad rudder sensor unit that we are no longer using if you want to swap it out and see if that is the fault.


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#9 ballystick

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Posted 28 October 2017 - 07:17 PM

I have added 2 more photos, it looks to be a J3000X. First I will tidy up the wiring  and re-calibrate the rudder sensor. I can try Willow's sensor too.


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#10 island time

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Posted 28 October 2017 - 11:16 PM

Rudder sensors for J3000x are still available, however if the factory reset and re-setup don’t work, my pick would be an issue with the J3000x. Worth trying another rudder sensor though.
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