Question about Northstar Generator 20 Hp, 13,000 Watt, Gasoline

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I have a North Star Model 5500 belt driven generator. I am using

A 1987 Chevy S10 engine to power this generator. While I was getting the combination to work together I revved the engine fairly high and must have overrevved the generator. There was no load on the generator at this time. Now I cannot get the generator to produce any electricity. This is a new unit and it did produce electricity prior to my overrevving it. Is it possible that I damaged one of the diodes or the capacitor while overrevving the unit even though there was no load on it at the time? Thank you for any advice that you may be able to give me about this situation. Langley McKinney

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  • langley_mcki Feb 22, 2009

    Thank you very much Carl. I greatly appreciate your response.



    Langley

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Hi there,
Yes it is very possible that you blew 1 or more diodes in the rotor when you overrevved the generator. You also likely shorted the MOV devices that go across the diodes as well. What happened is that the over speed of the rotor caused it to make a much higher voltage than it was designed for and something had to give. I'd suggest that you also look at the capacitor that connects to the stator windings (it's a little like a voltage regulator), you've probably exceeded its voltage rating.
This is pretty much why there are governor mechanisms on generators, much more than 20% or so overspeed makes nasty things happen.

Carl

Posted on Feb 22, 2009

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