I have an older 30KW Generac SG 030 1800rpm running on Nat Gas which I bought used. It has set up for several years. I installed a new PN0830890SRV master control board I bought from the local Generac dealer. I have a 1" 5 psi supply line of natural gas connected to a 11"WC regulator at the skid. I have also installed a new secondary regulator which drops the gas pressure to the carb. to 3-6"WC. I set the no load rpm on the governor down about 1050rpm until I checked out the system. The engine starts and runs for about 20seconds then shuts down on overspeed. I attached my Fluke to the output of the magnet speed pickup on the flywheel and I get a 3.4KHz output to the control panel. The unit shuts down repetively after 20 seconds. Does the new control board have a 1800 / 3600rpm selector? Do you have additional troubleshooting suggestions. Thanks, David in Houston.

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BrianHaze

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Posted on Nov 08, 2017

BrianHaze

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Need to calibrate the main control board. 83089. also is it overspeed or overcrank? if the board does not see the right rpm or is blow a certain threshold it will think it has not started yet and shut down on overcrank.

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RSG000

26 Answers
Posted on Jul 09, 2009

SOURCE: Attempted to start Generac Guardian 15 kw air

I work on these every day. Its either gonna be the rotor or stater, the voltage regulator, but most likely its a bad stepper motor which is the throttle motor, or control board. Thats all that could be causing that so its one of those. If its the rotor or stater thats bad it causes the generator to RPM up because it thinks its not producing enough power due to that. I had the same problem with the same one we just fixed and it was the slip rings on the end of the rotor so bad rotor.

Anonymous

1 Answer
Posted on Jun 07, 2010

SOURCE: Generac Guardian 15 kw overspeed fault

Did you remember to set the overspeed shutdown threshold on the control board?

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