ST4000+ issue.

[Birdseye]

Everything works, all the buttons and the tiller ram connected to it except for one thing. You can press both +1 and +10 together to get the pilot to tack the boat but in my case it will only work to starboard and not to port. The -1 and -10 buttons work OK in isolation but if pressed together, there is no tack.
I have opened up the unit and it is fine inside with no burnt compnents or corrosion / water etc. It works as well now its back togehter as it did befoe I opened it up.
I am left wondering whether this is a failure of the 4000+ itself or another issue. This is that I had to repair the masthead ananometer and I reassembled it 180 deg out of line so that it works with an alignment set up of +180. The obvious question is whether the pilot when tacking is affected by the wind or just the giro compass. It is not set to steer by the wind.

Ideas?

 

[Birdseye]

nobody else got any idea?

 

[doug748]

Try it at sea hard on the wind,
I think there is an anti gybe system so if you are trying in harbour, with random wind, the results will be unpredictable.
Possibly similar thing if the wind input is aligned incorrectly.

 

[Birdseye]

Interesting comments. I have tried it at sea but cannot remember whether it was set to steer by the wind or not. Most likely not, in which case the anti jybe system and wind alignment wouldnt matter.

 

[Birdseye]

The plot deepens Doug. If I disconnect the Seatalk from the back of the ST4000+, then the autoitack works on both tacks, so there is clearly something in one of the other instruments that is preventing tacking to port. The gyrocompass seems OK - it always provides a sensible heading.
I can find no mention of a gybe prevention facility in the pilot.

 

[Birdseye]

What it is to be right Doug! I left the Seatalk connected to the plotter and disconnected the anenometer and it all worked fine. The offset I have had to put into the anenometer to make it read direction correctly is over 70 degrees so it looks to me as if the system picks up the actual anenometer reading rather than the corrected one and this causes an anti jibe facility to be triggered. Wiring all checked so its a trip to the masthead to asseble the unit correctly.

 

[doug748]

Good show, I was sure I vaguely remembered something about this problem. I have a standalone wind jobbie and it's miles out of alignment because I am too idle to fuss around sorting it.