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Open Roads Forum  >  Tech Issues

 > Generator breaker keeps shutting off immediately

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time2roll

Southern California

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Posted: 02/18/21 02:56pm Link  |  Quote  |  Print  |  Notify Moderator

SHRED wrote:

time2roll wrote:

170v sounds like a regulator issue or an open neutral. Best to have a pro look at this issue.


I'm in Encinitas, CA (San Diego County).
Do you know of any good shops in my area?
I don't.

My best shot would be to call someone 5 star rated on YELP.

https://www.yelp.com/search?find_desc=on........epair&find_loc=Encinitas%2C%20CA%2092024

Hopefully someone will soon post a good shop in your area.


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SHRED

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Posted: 02/18/21 03:03pm Link  |  Quote  |  Print  |  Notify Moderator

Would a bad Automatic Transfer Switch cause the genset breaker to trip off?


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dougrainer

Carrolton, Texas

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Posted: 02/18/21 03:05pm Link  |  Quote  |  Print  |  Notify Moderator

SHRED wrote:

Would a bad Automatic Transfer Switch cause the genset breaker to trip off?


Yes, Shorted contac points or BURNT Transfer relay/wires at the Transfer box. BUT, THERE SHOULD NOT BE 170 VOLTS, PERIOD! THIS is what you need to look at. Doug

YC 1

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Posted: 02/18/21 03:22pm Link  |  Quote  |  Print  |  Notify Moderator

SHRED wrote:

Would a bad Automatic Transfer Switch cause the genset breaker to trip off?


Yes, and you could lift the wires off it for a test but as mentioned, that voltage is far too high. You could have two problems.

The high voltage could have toasted something that has now become a short or at least enough of a load/short that it trips the breaker.

I would assume you have checked the voltage on other things with your meter such as the shoreline outlet. Just to assure your meter is working correctly.

If shoreline power is working fine and nothing is NOT working inside, that is the microwave and any other electrical devices are working then the short would seem to be from the transfer panel towards the generator.

There could be a partially melted wire touching the frame of the rv that has just a few strands touching.

Lifting the wires off the transfer switch that come from the generator should check that. If the thing still trips, pull the wire off the generator breaker and put your meter into the Ohm position or continuity test and check the wires that are now disconnected from both ends.


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Bobbo

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Posted: 02/18/21 08:15pm Link  |  Quote  |  Print  |  Notify Moderator

Since it is an ONAN, check CUMMINS/ONAN's website for certified service centers in your area.


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Gjac

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Posted: 02/19/21 09:17am Link  |  Quote  |  Print  |  Notify Moderator

Does your genset seem like it is running at a higher rpm than normal? You can buy cheap HZ meter plug it into your 120 v socket and adjust the speed to read the correct HZ at the proper rpm.

SHRED

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Posted: 02/19/21 01:45pm Link  |  Quote  |  Print  |  Notify Moderator

Good news I think.
I unhooked the ATS and the generator breaker stayed on.

My next question is...If the generator output is indeed 170VAC as it tests, could that voltage harm the ATS?

The running RPM of the generator does not appear to run any higher than normal.

SHRED

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Posted: 02/19/21 02:16pm Link  |  Quote  |  Print  |  Notify Moderator

Good news I think.
I unhooked the ATS and the generator breaker stayed on.

My next question is...If the generator output is indeed 170VAC as it tests, could that voltage harm the ATS?

The running RPM of the generator does not appear to run any higher than normal.

SHRED

Encinitas, California

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Posted: 02/23/21 10:48am Link  |  Quote  |  Print  |  Notify Moderator

UPDATE

I followed this video for testing.

MEASURING YOUR GENERATOR WINDINGS

I then called Flight Systems with the results.
They are so helpful.

Pins 9 and 10 test was not good.
I've got new brushes and springs coming plus I need to shine up the rings.

Chances are my regulator is damaged they said by the fluctuations from the brushes not making good contact.

That video is very helpful.

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