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Generators In this forum we will try to answer any of your questions about the different model generators that can be found on Blue Bird coach's.

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  #1  
Old 01-03-2020
BrianS BrianS is online now
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Default low voltage from generator

15Kw PowerTech. Went out to exercise it, started easily, seemed to run at normal speed, but both voltage meters were only reading 70-80 volts. Let it run awhile, and went out and looked if the fan was running, it was, went back in and voltage was up to normal. Any ideas if I have a problem?
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Old 01-03-2020
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Might need a voltage regulator.
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Old 01-03-2020
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Disconnect the e fan 240 power and shut load center main off. If it makes a quick 120v on next start could be muffed load appliances or failing genset coupler .

Could then, put a big demand on the panel then turn main on and see if the abrupt requirement pulls volts.
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Last edited by GregOC; 01-03-2020 at 11:00 PM.
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Old 01-12-2020
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Brian, any luck with your issue? I’m having an issue also. I started mine today to exercise it and ran fine for twenty minutes with a load and then amps spiked and volts dropped to almost nothing. Genny never stopped running. Restarted with minimal load and ran fine for a few minutes and it did the same thing. The voltage regulator was changed in late 2018.
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1979 FC31
1983 PT40 (Sold)
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Old 01-12-2020
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Were you disconnected from shore power when you performed this test and was everything turn off inside the coach, ie: HVAC units battery/inverter, etc. ?
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1990 WB 40 "Northern Lights"
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Old 01-12-2020
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Quote:
Originally Posted by brhodes View Post
Were you disconnected from shore power when you performed this test and was everything turn off inside the coach, ie: HVAC units battery/inverter, etc. ?
Barry,
Initial test: Started the gennie with minimal load. Showed 120v on both legs. Let it run for five minutes, then added one A/C then a second. Ran fine for about 20 minutes. Then the amp gauges showed a spike of amps from 10 to around 50. Volts dropped on both legs, surging between 60 and 100. Could have been lower but the gauge bottoms out at 60.

Shutdown the gennie and restarted with minimal load and it dropped out the same way within 3 or 4 minutes. I was connected to shore power but I turned off the breaker at the box before starting the gennie.
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Decatur, Al
1994 WB
1979 FC31
1983 PT40 (Sold)
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386-785-5551
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Old 01-12-2020
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Disconnect from shore power so you are not ground connected.
Turn off all secondary breakers in the main AC power panel leaving the 2mains on and start generator.
Watch gauges for amps and voltage to see when the transfer switch engages and see what happens.
If the generator runs fine and voltage is good (120 range), amperage should be 0 as no load is on it.
To see if you have an issue with one of the HVAC systems, turn on one breaker at a time as well as the AC and see what happens with the amps to determine if you have an issue with a start system of the compressor which will spike your amps momentarily as it starts up.
If they are OK, then add each breaker one at a time and watch you gauges to isolate the issue.
Could still have an issue with the genset if you damaged a stator winding to ground and it is arcing when placed under load.


Good luck
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1990 WB 40 "Northern Lights"
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Old 01-12-2020
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Will try everything tomorrow. This issue started last summer when we attempted to run the A/C while returning home from a week out. Started the gennie while traveling and added the A/C. It ran for about ten minutes and lost voltage. Returned home and it worked fine as tested at least twice. Now it has returned. Also a new Rotor/Stator kit installed 8/2018. The unit has only had maybe two to three hours since rebuild.
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Decatur, Al
1994 WB
1979 FC31
1983 PT40 (Sold)
Lance.wilson59@gmail.com
386-785-5551
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Old 01-12-2020
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Sounds like you may need a new HARD START KIT on that AC unit.
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