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My 20Kva Generac generator run for about 30 minutes and automaticly shut off. The alarm indicated that the generator has over speed. I don't know where to adjust or set the right hz.

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The speed should be such that 60 Hz is generated when under load.

The govenor MAY be out of adjustment.

The speed for 60 Hz should be one of the following:

3600, 1800, 900 RPM

Posted on May 09, 2010

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    What kind of oil do you use


    Judy, Generac portable generator oil recommendations. Above 40°F, use SAE 30. Below 40°F and down to 10°F, use 10W-30. Below 10°F, use synthetic 5W-30. Oil should be changed after the first 8 hours of operation and every 200 hours of run time thereafter.
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    "I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

    http://www.generac.com/service-support/faqs/portable-generator-faqs

    http://www.generac.com/service-support/faqs/home-backup-faqs

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    The current models of automatic standby generators will have LED indicator lights on the side compartment of the generator. A green LED light will indicate that the unit is in AUTO mode and is ready to run, or is running properly during a utility outage. The yellow LED light will indicate that maintenance is needed. The red LED will indicate either that the unit is switched to OFF or that there is an alarm detected. If a yellow or red LED are present, you will need to check the generator's control panel, as it will describe the type of maintenance needed or the alarm present. This information can be found in the owner's manual as well. You can find a copy of the owner's manual online by searching the model or serial number of the unit here
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