Quote:
Originally Posted by Americanrascal
Our Cummins Onan 5500 seems to work well. Today something went haywire when I did the monthly excercise.
It started and cranked out 115-120 volts on each leg initially today. But then it kicked out a Brown Out warning on the power management panel showing leg 2 was only getting 82 volts when the rear A/C came on. I immediatly shut down. At the time I had the forward A/C running on Leg 1 and it was running fine on about 115 volts. During the run I had my shore power surge protector hooked to the 50 amp house outlet but I had the power off during the entire cycle.
To check things out after shut down, I then connected shore power showing 120 volts on each leg and both A/C units ran fine. No brown out.
Next I removed shore power and surge protector from its wall connection and cycled the 2 breakers on the generator and fired it up.
Everything ran fine during that excersise--- no brown out.
I sense soemthing is amiss but not sure where to check.
Any ideas on what I need to be looking for? Surge protector when connected but with no power??? Weakening breaker on the generator? Transfer switch?
Thanks Joe
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Sounds like the AC unit may have had a hard time starting or maybe it was trying to start at the same time as some other high current device. It’s also possible a starting capacitor could be weak.
Or maybe the generator had issues picking up the load since it had not been started in a while.
If the problem cleared up, I wouldn’t worry about it unless it reoccurs.