Weekly test always runs fine, but when I have real loss of utility power, gen initially automatically starts then shuts down in a few seconds with ac sens loss fault. However, I can then start gen manually and gen runs fine until utility power restored, then shuts down automatically as it should. When installer trys to "simulate" loss of power (flips a switch at panel), all works fine. It only exhibits ac sens loss and fails to continue to run when REAL loss of utility power occurs. Naturally, very frustrating. Gen runs on LPG.
SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss
Sounds like Generator mode switch should be "ON".
SOURCE: i have a lp 0043580
Are you overiding the auto switch by putting it in remote position then closing the start contacts with 173 and 184 wires ?
SOURCE: Have Onan 3.6 KY propane
I am not familiar with your peice of equipment but from your description of the fault being Under Frequency it appears that generator governor is out of adjustment or the governor spring has brcome weak or broken and not allowing the engine to run at the correct speed to produce an output frequency within the allowable tolerance. Governor linkage could also be binding and not moving smoothly to respond properly to engine load conditions. Thoroughly check governor and throttle linkage for free and smooth operation and full range of movement.
Another cause could be that the engine is not getting sufficient fuel causing the governor to have the throttle wide open to try to get engine to run at its correctly governed speed but unable to do so because the engine is not developing enough horse power.
SOURCE: Displaying OC after repeated weekly self-test
Its shutting down on over crank, which is a safety to protect the starter.
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