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Old 17-08-2015, 18:07   #1
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Why is my Robertson AP200DL sleeping on the job

Robertson AP200DL autopilot sleeping on the job Reply with quote Edit/Delete this post
When I am in autopilot in calm to 2 ft seas the autopilot can work fine for hours. Once the seas pick up a bit, the autopilot loses control and alarms fairly frequently. What happens is that I will note that it has not corrected for awhile, and the an alarm sounds saying that we are more than 20 degrees off course. The code that is set is F80 -off course warning. When this happens the autopilot brings it right back in, but on occasion it over corrects.

To me, the laymen it seems like for some reason it stops auto piloting until the alarm wakes it out of it's stupor.

Any idea on where I should start looking? By the way I have one control on the flybridge and one in the pilothouse. They both have the same problem.
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Old 25-08-2015, 07:58   #2
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Re: Why is my Robertson AP200DL sleeping on the job

Any ideas on my Autopilot problems?

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Old 25-08-2015, 17:18   #3
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Re: Why is my Robertson AP200DL sleeping on the job

Check your fluxgate compass. It sounds like maybe the fluxgate compass jams when the boat starts bouncing around. The manual can be downloaded here.
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Old 25-08-2015, 17:32   #4
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Re: Why is my Robertson AP200DL sleeping on the job

or possibly the auto pilot being overpowered by the rudder when the water is rough sends it into some mode ....?
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Old 26-08-2015, 06:57   #5
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Re: Why is my Robertson AP200DL sleeping on the job

there is some water in the area where my fluxgate is mounted. Any chance that splashing water would cause my symptoms?

Thanks
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Old 04-09-2015, 15:45   #6
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Re: Why is my Robertson AP200DL sleeping on the job

Update.

I just got back from a 6 hr cruise today. The waves were 0-2 ft. After about 45 minutes the above problem of going way off course occurred. After shutting the unit off and then turning it on, the unit would work 5 minutes to as long a 1/2 hr before going off course. I have convinced myself that the problem is not rough water related.

any ideas would be appreciated.

If it is the fluxgate compass how do i troubleshoot it?
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Old 22-09-2015, 15:16   #7
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Re: Why is my Robertson AP200DL sleeping on the job

I checked and cleaned all connections and they looked good. Took it out for a ride.

I also drained and refilled the hydraulic reservoir. The autopilot work fine for 25 minutes or so, then started to screw up. It started drifting to port. At 20 degrees off, the alarm went off and then it woke up and corrected to starboard.

I believe that it always drifts to port when it screws up and only does it when warmed up. It does not seem to be wave dependent. Any ideas?

Thanks
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Old 13-10-2015, 08:45   #8
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Re: Why is my Robertson AP200DL sleeping on the job

Two things come to mind. I have the same unit and am familiar with it.
First, and most likely, is to check the area around the flux compass for anything that might influence the compass. Cans of food in a adjacent locker were the offending gremlins in my case. I think the specs call for 2 feet clearance. I went with 3 and that did the trick.
I would also check the power source to make sure it's not fading in and out due to any number of reasons.

Hope this helps


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