alpine
I installed this generator two years ago, it runs on LP. After one year the unit started having repeated overspeed errors, shutting down at startup. It always has "started hard." About 50% of the time the generator will start fast but recover and run steadily at 60Hz and at 246.3V, no load. When a complete overspeed and shutdown error occurs, 85Hz Max is observed. The diagnostic manual from generac points to the stepper motor, but it seems to be functioning normally and checks out on resistance tests. Any advice or direction on further troubleshooting would be much appreciated. Thanks for your help!
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Geoff Z
Hello Alpine. A frequency of 85 would mean the generator is running at 5100 RPMS. How are you measuring frequency? The generator should shut down around 70HZ.
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alpine
I am measuring frequency with a Fluke 1587 MM, on Hz, MAX. With generator stopped I place leads across the gen output breaker, manual start the gen, watch it crank, start and go crazy fast for about 3 secs then shutdown. 5100 RPM sounds about right. I have not measured Hz MAX when the gen starts, goes fast and then recovers, but I suspect it is just under the overspeed threshold.
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bronco
Move the governer arm through it's full range any binding, hitches?

Check throttle linkage for binding then see if you can look down the throttle body at the butterfly's might be one missing.
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alpine
I am assuming that when you say governor arm you are referring to the stepper motor arm on this unit. I did check its range of motion. It was not easy to move, but would run through the full range of motion. When the unit starts and runs normally the arm moves as expected.

I will look down the throttle next time I am at the site. If a butterfly was missing would the unit run normally at all? Any other ideas? I would like to try as many as possible to minimize trips.

Thanks for your help.
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MASTERTECH-MW
I have had the butterfly stick also
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