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Old 12-11-2010, 07:35 PM   #1
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Generator over voltage


I hooked up a generator to a transfer panel which went through a 3 position gen knife switch first with neutral from the main to a subpanel and neutral to the trans panel all together , I wasn't getting any voltage at hot leads so I disconnected neutral from gen to knife switch ,burned some small appliances and surge protectors . When I checked voltage on Kohler generator I got over 300 volts , I didn't mess with neutral while gen was running . what could be the problem, I've hooked up many generators before and never had a problem like this ,I know I didn't cross a hot and neutral as I triple checked everything .


Last edited by hotwire62; 12-11-2010 at 07:40 PM.
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Old 12-11-2010, 08:27 PM   #2
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Generator over voltage


300 volts measured from what to what?



sounds like a bad voltage regulator though.

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Old 12-11-2010, 09:57 PM   #3
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Generator over voltage


measured at the hot leads on the L14-30 twistlock recept on the generator
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Old 12-11-2010, 10:56 PM   #4
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Generator over voltage


sounds like a regulation problem.
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Old 12-12-2010, 12:26 AM   #5
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Generator over voltage


Is this generator is portable or stantory unit ? and model number if possible.

That is a classic overvoltage the votlage regulator is stuck or overspeed on portable unit { with non adjustable voltage regulators }

The netural should never be lifted at all with all transfer switch I know in resdentail side it will never be lifted if you did lift it anything still on 120 volt circuit can get fried when the voltage go over the safe level.

And with two pole generators at 60 HZ unloaded speed should be little over 3600 T/ min while loaded should slam right on 3600 T/ min.

Ditto with 4 pole generators it wil be 1800T/min.

Is this unit is brand new or have super low hours ? if still under warranty have a generator dealership or generator tech fix it and have them run a load test to make sure it working properly.

Merci.
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Old 12-13-2010, 11:18 AM   #6
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Generator over voltage


The generator is a Kohler 8000w PM0418000 , I figured the regulator was probably shot ,the question is did having the neutral hooked up at the subpanel cause it some how. does anyone know if those regulators are adjustable . Thanks It is a portable unit.
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Old 12-14-2010, 12:32 AM   #7
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Generator over voltage


That is a Coleman generator I did have to do little digging and found the part number it is 0063948 and I do not know which state you are in once you mention to me which state are you located then I can able send you the nearest part centre to get this part you need and it is a AVR it will be on end of the generator as I will post the PDF for it.

PDF file for this genny

Costwise that part I do not know unless I get a hold of factory direct or you can able get ahold of them direct. { www.powermate.com }


Hope that help ya

Merci.
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