[chadjones999]

once again tabora thanks for your help, I know its difficult trouble shooting something that is not in front of you

 

[OrlyP]

Totally missed that one. Yes, a brushless (capacitor-excited) generator requires the engine to run at 3600 RPM to generate both the correct frequency (60Hz) and rated output voltage. If it spins slower than that, expect both the frequency and output voltage to sag.

It's quite possible that someone inadvertently adjusted the throttle and/or governor settings (spring tension, spring position, calibration, etc.) or the engine probably just needs a tune-up because it is down on horsepower.

If you push or pull on the governor arm to open the throttle, does it reach 3600 RPM (60Hz) or higher?

 

[chadjones999]

Totally missed that one. Yes, a brushless (capacitor-excited) generator requires the engine to run at 3600 RPM to generate both the correct frequency (60Hz) and rated output voltage. If it spins slower than that, expect both the frequency and output voltage to sag.

It's quite possible that someone inadvertently adjusted the throttle and/or governor settings (spring tension, spring position, calibration, etc.) or the engine probably just needs a tune-up because it is down on horsepower.

If you push or pull on the governor arm to open the throttle, does it reach 3600 RPM (60Hz) or higher?

well without a tach Im guessing but I can say it sure sounds like it is at 3600, now that could be off a few RPMs without a tach. , I am at 8k feet above sea level also... but this is like a 750 CC diesel engine, rated only at 5kw, it should not sag unless heavily loaded , all these readings are no load. also its not blowing smoke ( like a none turbo diesel truck does at 8k elevation lol )
It was on a job site someone could have screwed with it, but I have moved the governer all the way to the opposite side and it did speed up. but still not reaching required HZ ,
its at the point if I pull on the spring it only slows it down now. .
oh one more thing I took my meter and tested a gas generator I have to verify meter is reading correct. and my gas gen is reading dead nuts 60 HZ , 62 unloaded and 122 volts at same 8k above sea level ( not even jetted for this elevation )

 

[OrlyP]

No need for a tach if you can measure the frequency with a multimeter. Once you hit 62Hz unloaded, the engine RPM will be around 3,720 RPM.

Formula:
RPM = Frequency (Hz) x 60

So anyway, your problem is the engine. It's not reaching the correct RPM so along with the frequency, the voltage is also low.

 

[tabora]

this is like a 750 CC diesel engine

Actually, it should be a Yanmar LW Series 435cc air-cooled direct injection, industrial-grade diesel engine...

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[chadjones999]

Actually, it should be a Yanmar LW Series 435cc air-cooled direct injection, industrial-grade diesel engine...

Page Not Found | Generac

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www.generac.com

You are correct, either way enough to spin this up to speed unloaded. it runs GREAT . I have had them for about 2 to 3 years and I have never even charged the battery and pushed the button to start them twice ( until this latest issue ) , both times I started it, it fired right up like it was bought yesterday! ( as for the engine )

 

[chadjones999]

SO I guess next to buy a tach...
part 1 part one Generac 5kw diesel has low voltage and low frq (HZ 53 )

part 2 part 2 generac low voltage & HZ

part 3 part 3 generac low voltage & HZ