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Auto-pilot clutch slips under load to portside

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moli View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote moli Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2024 at 20:34
Hello,
I carefully read the previous posts, I also had the same problem with the jefffa autopilot, it slides in one direction and holds in the other direction and my chain is tight, it doesn't jump over the sprocket.... Hmm new ideas? THX
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Dogscout View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dogscout Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2024 at 12:42
Hello all. I am experiencing a problem with my 430 that I believe is the same as postd here. I believe that mine is the clutch disengaging when pressure (force) against the rudder is to great and causes an over current protection thus the computer releases the clutch. This makes a banging sound. I have inspected the sprocket and chain and there is no abnormal wear so I do not believe that the chain is alipping. Tension seem correct. What I have noticed is that the wiring from the AP (NAC 30) is original 2008 and has turned green and black at the connections in the rear lazarette. The red and black wires coming from the motor are this way and too short to cut back to clean copper without opening the motor. I found this because the red wire broke at the fuse holder. I replaced the fuse holder and tried to solder a new one in but the condition of the wire made that difficult.  

I will eventually replace all of the wire from the AP computer back to the motor, but not able to for a few months.







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JonB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2024 at 14:45
What amps is the fuse next to the motor rated at, my 470 was at 40amp yet according to Raymarine's appointed Engineer, the Autopilot could only handle 15amp and so it was realised that the model installed that replaced like for like, almost, with the old one was too small.

The way we tested it was we put the autopilot on to hold course and then pushed the wheel over to represent weather helm and the electrician measured the amps.  This took it easily to 15amps quite quickly.  However, if it is 'slipping' in only one direction then are there teeth missing on the cogs, an easy spot.
Jon B
470e
http://www.norse-king.blogspot.co.uk
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Dogscout View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dogscout Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2024 at 17:18
My fuse at the motor is 15 Amp. B&G say that the NAC 30 will give 30 Amp to the motor. The previous original AP computer was a SIMRAD I do not recall the model. I want to put clean new tinned wire in and will likely choose a heavier wire. I think that the existing wire is 6 mm2 so I'll put 8 mm2 when I replace it. I do not think that I have a mechanical problem. I think it's all electrical. But hey I could be wrong. 

There is no noise or problem when hand steering in heavy weather.  


Edited by Dogscout - 22 March 2024 at 17:19
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JonB View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote JonB Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2024 at 18:02
Could this be another problem in that if the Autopilot is holding you steady in bad weather and the NAC 30 compensates for a wave slap or gust and increases the amperage you'll pop the fuse and well, we all know when these occasions occur!

Check the steering limiter sensor as if working ok in one direction but not the other it could be this that is faulty.

If your boats out of the water then set a course with the Autopilot, lash the wheel/tiler down and move the rudder, or get someone to hold the rudder steady and move the wheel and see if it 'lets go'.

We found we'd just were blown where ever the wind wanted to take us but luckily we were usually on deck and saw NK changing course, because ours fuse could more than handle the output from the Autopilot, the Autopilot would 'let go' and so it happened quite early in reasonable winds, it didn't need to be in bad weather
Jon B
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http://www.norse-king.blogspot.co.uk
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Dogscout View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dogscout Quote  Post ReplyReply Direct Link To This Post Posted: 22 March 2024 at 22:40
The fuse has never blown. Is it unreasonable to consider that the motor requires more current but the wire cannot carry it? I'm no Electrical Engineer, I'm Industrial. I have replaced the cables because one was severely frayed and I set the cable and chain tension as Jefa requires in the service sheet. I have looked at the chain and sprocket and there is no wear. Years of motorcycles have shown me what that looks like.  

I would like to put a meter on it to show the current when the fault happens but again I am not a sparkey and not really sure how to do that.  
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