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Pto generator problem

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carl in nc

08-03-2000 20:32:07




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i have a pto generator that has not been run for 5 yrs or so. i cleaned and roughed up the brushes and their contact areas with emery cloth but still no output of electricity. i have heard people speak of ( shocking) a generator to get it working after it has been idle for long periods, how is this done? thanks,




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Gregg

08-05-2000 15:11:55




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 Re: pto generator problem in reply to carl in nc, 08-03-2000 20:32:07  
I have a older Kawasaki gas generator that i have to "polorize" if it sits for 6-8 months, all i do is take the cover off to gain access to the brushs and take a 12 volt battery with a couple jumper wires and just momentarly touch the 2 brush terminals with the generator running and it starts to charge and is ok after that until it sits a long time again.



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Russ

08-05-2000 06:23:37




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 Re: pto generator problem in reply to carl in nc, 08-03-2000 20:32:07  
You need to flash the field. It`s not unusual for this to happen to a generator that sits for a long time. If memory serves me correctly, you attach the positive terminal of a battery to L1 on the GENERATOR, not the ac output, and the negative goes to L2 of the generator. Bring the unit up to speed for about a minute and then shut it down. Should produce output now. Disconnect the battery now. BTW, note my comment about memory, I hope to stimulate discussion on this subject to validate or correct myself on this before anyone does it.

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carl in nc

08-07-2000 19:26:20




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 Re: Re: pto generator problem in reply to Russ, 08-05-2000 06:23:37  
russ, I took your advice and hooked up a 12 volt battery the way you suggested and ran the generator for a minute or two. things started heating up between the battery and the generator so I shut it down and unhook it. when i started it back up everything seems to be working fine. I hooked up an air compressor to the 125 outlet and it works fine. haven't tried the 250 circuit yet but the gauges are in the green range at about 520 rpm. many thanks for the advice. I'll be ready for the next huirricane or ice storm in n.c.

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Tyler(WA)

08-04-2000 07:22:56




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 Re: pto generator problem in reply to carl in nc, 08-03-2000 20:32:07  
Sounds like your talking about "polarizing" a generator. Generators produce DC and do need to be initally polarized. I would imagine you have an AC power production unit which would make it a PTO powered alternator. Alternators produce AC and do not need polarizing. I think you have a different problem. You may want to have your armature and windings checked out.



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MarkB

08-05-2000 05:31:49




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 Re: Re: pto generator problem in reply to Tyler(WA), 08-04-2000 07:22:56  
Most alternators have a built-in DC generator that is used to excite the field, so it's likely that Carl's has one too.

On the other hand, it seems unlikely that a generator would lose residual magnetism after just a few years. I also suspect that it's something else. Without a schematic to work from, I wouldn't speculate where to start.



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carl in nc

08-06-2000 21:03:56




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 Re: Re: Re: pto generator problem in reply to MarkB, 08-05-2000 05:31:49  
i appreciate the recommendations so far although i would like to hear from someone who has actually done this shocking or flashing a pto alternator before i try it. this unit is an old winpower 20 kw/35 kw probably 20 years old and hasn' t produced electricity in the last five years but was working fine before that.



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