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OT electrical question for John T and others

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Bob M

01-05-2006 09:54:24




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John T - I have a puzzling problem with a 15 KW standby generator over on "Tool Talk". Your thoughts on the problem/solution would be very much appreciated! ...Bob M




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John T

01-06-2006 11:33:34




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 Re: OT electrical question for John T and others in reply to Bob M, 01-05-2006 09:54:24  
Wow, Sorry Bob Im here late, just found this on this page, but Im not much help anyway without any schematic in front of me. By "brushless" are there still slip rings with any external Voltage Regulator Module or is it all integrated into the rotor internally???

Regardless, my first impression is inadequate rotor current/excitation, but if it had an external VR module I would suspect or replace/substitute it first, but if not (all integrated) then Im afraid Im of nooooo oooo advice whatsoever,

Sorry, wish I could help to repay all you have helped me, but on those type things without a schematic Im not much count.

John T

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Hermit

01-05-2006 19:14:23




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 Re: OT electrical question for John T and others in reply to Bob M, 01-05-2006 09:54:24  
Could it be that the diodes are the source of the field current? If one of the diodes was shorted, the resulting voltage to the field would be a rougher, shallower pulsating DC not allowing full build-up of output voltage. Or if one of the slip-ring brushes was stuck in the holder, broken brush spring, corroded brush end, etc., not allowing current flow. It's a theory anyway.



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Hugh MacKay

01-05-2006 15:29:36




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 Re: OT electrical question for John T and others in reply to Bob M, 01-05-2006 09:54:24  
Bob: When I read this title, my first reaction Bob M. must have had a memory lapse. I can't give you any technical advice, however I once installed a new PTO 25KW on my dairy farm. My connected load was about 25KW, as was my entrance from the electrical utility. My brother installed this for me complete with double throw switch, so I couldn't accidentally put power back out on the grid.

The only advice I got or ever needed with this unit was give it a workout at least every two months for 12 hours. I was told that condensation within an operating dairy barn will cause coroding in these units. My unit had an anti condensation device connected to power 24-7. Frank (my brother) said," That is not good enough, nothing will replace exercise for this unit in the dairy barn." I did as I was told and really never had any problems. Just a thought, maybe your unit needs a good workout.

I know my unit always gave the 656D a good workout when we were milking, cooling, silo unloaders running, Marg. doing her thing at the house, etc. When that 282 diesel is working hard, whatever is connected to the shaft must be getting a workout.

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jayw

01-05-2006 13:16:34




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 Re: OT electrical question for John T and others in reply to Bob M, 01-05-2006 09:54:24  
Bob
Are you checking the voltage from the genny too the Breaker or after the Breaker?



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Randy in NE

01-05-2006 10:47:43




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 Re: OT electrical question for John T and others in reply to Bob M, 01-05-2006 09:54:24  
Bob, I think you nailed it on the head about the field current. That is what is going to provide the excitation to the windings. I am not sure how the extra 50 (3650) rpms affect the voltage. For a 2-pole generator/motor 3600 rpm's will produce 60 Hz output. If you were able to obtain the schematic for the generator you might be able to perform a more in depth diagnotics. I have taken enough electrical theory classes between NucPower and college to be dangerous about this. Hopefully an experienced electrician type will jump in here. Randy

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