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 > Generator breaker keeps shutting off immediately

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SHRED

California

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Posted: 02/17/21 08:57pm Link  |  Quote  |  Print  |  Notify Moderator

1995 Lazy Daze.
Onan generator.
Progressive Dynamics PD4645 converter.

There is no power reaching the motorhome from the generator.

I tested the leads to the breaker. One read about 170VAC with generator running. I shut the generator off and tested the other lead and it tested .266 kilohms so I don't think there is a short but I'm not very electrically literate.

I replaced the switch. That didn't fix.

AC voltage works fine when I plug into shore power.

I'm wondering what next to check.
Thanks.

[image]


2021 27' Lazy Daze MB... soon!


wa8yxm

Wherever I happen to park

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Posted: 02/18/21 05:11am Link  |  Quote  |  Print  |  Notify Moderator

There are shorts you can't find with a VOM. They are voltage dependent.
Alas I can not list them all but I can tell you now to narrow the search

INSIDE the RV turn off EVERY breaker. not fire up the generator. Turn on just the MAIN breaker... Still good (hook a test light or volt meter to the main braker and white bus to check or have partner watch generator breaker)
Ok turn on the next breaker, and the next and the next till CLICK.


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Dutch_12078

Winters south, summers north

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Posted: 02/18/21 06:59am Link  |  Quote  |  Print  |  Notify Moderator

You might find some help here:

Onan RV Troubleshooting Guide


Dutch
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dougrainer

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Posted: 02/18/21 10:15am Link  |  Quote  |  Print  |  Notify Moderator

The MAX genset voltage is 132 volts. The Voltage range on a Onan is 126 to 132 volts. IF you read 170, why would you think that is OK? THAT either means your Onan voltage regulator is toast or the Genset SPEED is NOT 1800 RPM's at 60 htz. Increase in speed will cause an increase in output voltage. Most common cause of this is novices that increase the idle speed to stop a surge/hunt genset run. This does NOT fix the problem but does stop the Hunt/surge. But does increase the output voltage. Doug

SHRED

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Posted: 02/18/21 10:16am Link  |  Quote  |  Print  |  Notify Moderator

Dutch_12078 wrote:

You might find some help here:

Onan RV Troubleshooting Guide


With every breaker off on the converter the genset breaker trips off still after about an 8 second delay.

* This post was edited 02/18/21 10:31am by SHRED *

time2roll

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Posted: 02/18/21 10:22am Link  |  Quote  |  Print  |  Notify Moderator

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


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SHRED

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Posted: 02/18/21 10:36am Link  |  Quote  |  Print  |  Notify Moderator

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?

KMLsquared

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Posted: 02/18/21 11:58am Link  |  Quote  |  Print  |  Notify Moderator

While I agree 170VAC is too high, I don't see why that would be tripping a over current device like a breaker. If all down stream loads are off and its tripping there must be a short between that generator breaker and the main breaker of the 120VAC distribution panel. Start tracing wires and opening junction boxes.

Odd the 170V as that is the peak voltage of 120VAC. Is your meter a good one or a cheap harbor freight one?


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SHRED

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Posted: 02/18/21 12:20pm Link  |  Quote  |  Print  |  Notify Moderator

KMLsquared wrote:

While I agree 170VAC is too high, I don't see why that would be tripping a over current device like a breaker. If all down stream loads are off and its tripping there must be a short between that generator breaker and the main breaker of the 120VAC distribution panel. Start tracing wires and opening junction boxes.

Odd the 170V as that is the peak voltage of 120VAC. Is your meter a good one or a cheap harbor freight one?


This is my meter.
It's been very accurate for other applications.

METER

ndrorder

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Posted: 02/18/21 12:41pm Link  |  Quote  |  Print  |  Notify Moderator

170VAC is too high. Disconnect the output wires from the generator breaker to get a good measurement of the voltage between the common and neutral connections at the breaker while the generator is running. If this is more than 132 VAC, generator issues need to be resolved before continuing.

The next step is to isolate the wire past the generator. So with the generator off, leave the output wires from the breaker disconnected and disconnect the generator input wires at the automatic transfer switch (ATS), or unplug the shore power from the generator receptacle. Now measure resistance between the common and neutral wires and common and ground wires. If anything other than an open circuit is measured, there is a short in the wire between the generator and ATS or receptacle that needs to be corrected. Best guess is, because of age, there is a generator receptacle and something inside that box has giggled loose and is shorting.


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2011 Four Winds Chateau 23U

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