| [GMCnet] Onan - troubleshooting [message #183365] |
Thu, 06 September 2012 13:23  |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Now that the Motorhome is mobile again, other things are breaking.
The Onan starts great, and runs fine. It runs the AC just great for about half an hour.
Then the voltage heads for the floor (looks like about 70 volts), and a get that lovely polyamide-polyimide odor near the generator (hot windings).
Keep in mind that I have a second one of these in the parts coach.
Suggestions on where to start looking?
Thanks.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 GMC 26' Palm Beach
TZE167V100820
1976 GMC 26' Donor Coach
TZE166V101610
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| Re: [GMCnet] Onan - troubleshooting [message #183367 is a reply to message #183365] |
Thu, 06 September 2012 13:30  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Start with an ampclamp<tm> on the output wires from the genset. My late airconditioner wiould do this for a bit and then kick off. Until it finally shoted cold as well as hot. Confrim first the load ain't changing. If it isn't, I'd then stick a probe in the oputlet air and see how much your Onan heats up. But I'm betting an overload based on your description.
--johnny
'76 23' transmode norris
'76 palm beach
6K Onan
3.6K Junkerac
5.5K Yamamamah
2.5K Onan
4.5K Kohler
From: Dolph Santorine <dolph@dolphsantorine.com>
To: gmclist@temp.gmcnet.org
Sent: Thursday, September 6, 2012 2:23 PM
Subject: [GMCnet] Onan - troubleshooting
Now that the Motorhome is mobile again, other things are breaking.
The Onan starts great, and runs fine. It runs the AC just great for about half an hour.
Then the voltage heads for the floor (looks like about 70 volts), and a get that lovely polyamide-polyimide odor near the generator (hot windings).
Keep in mind that I have a second one of these in the parts coach.
Suggestions on where to start looking?
Thanks.
Dolph
DE N8JPC
Wheeling, West Virginia
1977 GMC 26' Palm Beach
TZE167V100820
1976 GMC 26' Donor Coach
TZE166V101610
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Onan - troubleshooting [message #183528 is a reply to message #183365] |
Fri, 07 September 2012 11:11 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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| Dolph Santorine wrote on Thu, 06 September 2012 14:23 |
Now that the Motorhome is mobile again, other things are breaking.
The Onan starts great, and runs fine. It runs the AC just great for about half an hour.
Then the voltage heads for the floor (looks like about 70 volts), and a get that lovely polyamide-polyimide odor near the generator (hot windings).
Keep in mind that I have a second one of these in the parts coach.
Suggestions on where to start looking?
Thanks.
Dolph
|
Dolph,
I went to bed thinking about this, and I came up with an answer.
Unfortunately, it is ans answer you will not like......
The field windings of the NH power drawer and known to fail. They are aluminum windings and if the varnish coating gets damaged, the winding will corrode and break.
Yours did what it did (If I am correct) because you have only lost part of the field winding. That makes sense of what you saw because the compounding reactor that provides field current is a current driver with a positive feedback. So, it was trying to provide the field with the current it needed, but only part of the field was there (hence the smell).
As Ken if his motor rewinder had a chance to think about rewinding Onan NH fields......
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Onan - troubleshooting [message #183600 is a reply to message #183528] |
Fri, 07 September 2012 22:00 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Senior Member |
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Matt
Thanks. I'm going to publicly embarrass myself with this one.
I checked the voltage and frequency. Then I moved the sensitivity spring on the governor.
I did not check it again.
It was 168 volts. I moved the spring back and it was 126 again.
I set it up properly and all is fine.
Operator assumption and I did not double check. Too much of a child of the microprocessor, too.
Dolph Santorine
Dolph@DolphSantorine.com
Excuse me for not being my usual wordy and sporadically verbose self. This message is sent from my iPhone.
No trees were killed in the sending of this message and few long dead dinosaurs were involved. A large number of electrons were terribly inconvenienced.
On Sep 7, 2012, at 12:11 PM, Matt Colie <matt7323tze@gmail.com> wrote:
>
>
> Dolph Santorine wrote on Thu, 06 September 2012 14:23
>> Now that the Motorhome is mobile again, other things are breaking.
>>
>> The Onan starts great, and runs fine. It runs the AC just great for about half an hour.
>>
>> Then the voltage heads for the floor (looks like about 70 volts), and a get that lovely polyamide-polyimide odor near the generator (hot windings).
>>
>> Keep in mind that I have a second one of these in the parts coach.
>>
>> Suggestions on where to start looking?
>>
>> Thanks.
>>
>> Dolph
>
> Dolph,
>
> I went to bed thinking about this, and I came up with an answer.
>
> Unfortunately, it is ans answer you will not like......
> The field windings of the NH power drawer and known to fail. They are aluminum windings and if the varnish coating gets damaged, the winding will corrode and break.
>
> Yours did what it did (If I am correct) because you have only lost part of the field winding. That makes sense of what you saw because the compounding reactor that provides field current is a current driver with a positive feedback. So, it was trying to provide the field with the current it needed, but only part of the field was there (hence the smell).
>
> As Ken if his motor rewinder had a chance to think about rewinding Onan NH fields......
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| Re: [GMCnet] Onan - troubleshooting [message #183603 is a reply to message #183600] |
Fri, 07 September 2012 22:12 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Dolph,
You've made me feel a lot better about some of my screw-ups. :-)
Now if our elected officials just had as much gumption!
Ken H.
On Fri, Sep 7, 2012 at 11:00 PM, Dolph Santorine wrote:
> ...
> I checked the voltage and frequency. Then I moved the sensitivity spring
> on the governor.
>
> I did not check it again.
>
> It was 168 volts. I moved the spring back and it was 126 again.
> ...
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Onan - troubleshooting [message #183611 is a reply to message #183600] |
Sat, 08 September 2012 06:54 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| Dolph Santorine wrote on Fri, 07 September 2012 23:00 |
Matt
Thanks. I'm going to publicly embarrass myself with this one.
I checked the voltage and frequency. Then I moved the sensitivity spring on the governor.
I did not check it again.
It was 168 volts. I moved the spring back and it was 126 again.
I set it up properly and all is fine.
Operator assumption and I did not double check. Too much of a child of the microprocessor, too.
Dolph Santorine
|
Dolph,
You mean I wasted all that time spent Thinking?
(Actually, I'm real glad to hear that another NH is not dead.)
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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