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Old 28-12-2015, 15:53   #16
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Re: B & G Network auto pilot fault.

Quote:
Originally Posted by Symphony View Post

I am also thinking of digital things in general, especially software or comms protocols. when something is in an error state all bets are off!
Since no developer could possibly determine every failure mode, they do the best to write descriptive errors. Sometimes a failure occurs and the error message doesn't really match the failure mode. However, the error should provide a good hint at where to start looking.

I know nothing about older B&G autopilots, but in this case I would start checking connections between the RRU and computer for corrosion. As with all troubleshooting, you start with the simple stuff first. Then get a multimeter and measure the voltage coming out of the RRU. The installation manual has the following text:

"When the rudder is moved from hard-over port to hard-over starboard
the RRU arm should swing through a minimum of 90º, this will ensure
that there is sufficient voltage output to the autopilot. Measure the
voltage difference between the green and blue wires of the RRU,
there should be a minimum of 1 volt change from hard over to hard
over. N.B. If there is less than 1 Volt change the Pilot will not
commission. "

There are more troubleshooting hints on page 16 found here.
http://www.bandg.com/Documents/produ...epslanguage=de
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Old 28-12-2015, 18:02   #17
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Re: B & G Network auto pilot fault.

My experience with B&G is that it is VERY sensitive to clean good connections between units.
You should first look carefully at the rudder position indicator (should be connector near the ram) then clean all the connections and check voltage at the unit.
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Old 29-12-2015, 21:40   #18
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Re: B & G Network auto pilot fault.

I know this is substantially different that the other proposed solutions, but I solved some particularly vexing B&G Autopilot problems with a very different solution.

Actually, it was a SIMRAD autopilot controller and the linear hydraulic actuator. But the companies are both under Navico, so it becomes difficult to tell what is B&G and what is Simrad. And most of my other gear is from B&G.

My problem was that hydraulic linear actuator had leaked hydraulic fluid, and it couldn't execute what the course computer was expecting. As a result, I would get all sorts of error messages, but most of the concerned the rudder angle sensor. Since the course computer was saying "starboard!" and the rudder wasn't moving, the software presumed a rudder angle sensor failure.

I found it challenging to find any information on how to refill the hydraulic actuator in any of the Navico/Simrad/B&G documentation, but I ended up buying some hydraulic fluid and filling the reservoir on top of the actuator, then moving the ram back and forth to force out the air bubbles. I did this several times, then got the autopilot to work, and made it go through full cycles. I topped off the reservoir a few times while this was going on. Since then: perfect autopilot performance. It was not necessary to crack any hydraulic lines to bleed the system.

I hope this is helpful.

Chuck Hawley
Alerion Express 38 Yawl, #6 "Surprise"
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Old 30-12-2015, 05:37   #19
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Re: B & G Network auto pilot fault.

The OP's system is pre-Navico purchase.

Yes, a drive malfunction would also give the error he has. Besides air in the fluid, or low on fluid, other potential drive problems are worn motor brushes and a bad solenoid.

However, the OP's drive appears to be driving the rudder fine - just not in the way expected.

Hopefully he will return and tell us if he tried any of the suggestions given.

Mark
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Old 02-01-2016, 08:20   #20
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Re: B & G Network auto pilot fault.

Thank you so much to all the very helpful replies. I will work through the solutions when next at the boat. Much appreciated.
Regards
Mike
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Old 11-04-2016, 10:55   #21
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Re: B & G Network auto pilot fault.

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Originally Posted by YPSILANTI View Post
Thank you so much to all the very helpful replies. I will work through the solutions when next at the boat. Much appreciated.
Regards
Mike
Mike have you found the problem?
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Old 11-04-2016, 12:20   #22
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Re: B & G Network auto pilot fault.

Greetings,
Yes I did. With the help of this forum, I found that the small ball and sockets on the sensor attached to the rudder quadrant had become worn and had dislodged. I replaced the rod and sockets with a new unit and it is functioning flawlessly.

Thanks so much for enquiring and for all the assistance.

Regards
Mike
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