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soundguy,dell? portable genny electrical question

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maplehillfrm,pat

09-05-2006 06:34:32




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hello to you electrical gurus out here, I know there are a few of you, I use this generator as my portable welder as it was cheaper than running 220 to my barn, and this is handy, I havent had any trouble up till now, I was welding day before yesterday, [rained all day yesterday] just finished up welding, shut off the genny, wanted to clean up weld with the grinder so I start the genny, go for the grinder and nothing, what, check plug in nothing, hit on button nothing, I notice the power gauge on 0,, ok check for a burnt or broken wire , I dont see anything, after all I think this is 1956,, today I start it, [by the way 1 hand crank and it runs,,]look her over,, still cant find anythkng, I look at the wiring schematic, on the side figuring there should be a fuse or something, I find a resistor that shows it is wired from the reostat regulator to the magnet control.says 500 ohms? also stated under the picture in the schematic used to control overload to the magnet control,, could this be my problem, I am not too keen on genny current, not sure if I can jumper this like a N series tractor to see if its burnt or not?/ any help?? and will they just go like that, working and, then the next time nothing?? its not like I overloaded anything it just didnt eve try to work the last time I tried, [it was only like 5 minutes between shutting off the genny and restarting to try the grinder.. thanks , and sorry so long pat

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dave guest

09-07-2006 10:00:05




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 06:34:32  
With large rheostats they can get a little burned spot or oxidized. Try rotating back and forth and return real close to setting. Also on welders which were motor generator sets at GM, we would rotate all switches and controls and return to previous settings for same reason. After that and brush check, commutator clean, visual wiring, get out the ohm meter and circuit trace. Diagram helps a lot, too.

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Tom Evans

09-05-2006 16:58:03




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 06:34:32  
Check the brushes - have to do the same thing on an old Lincoln unit we are using.



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Dell (WA)

09-05-2006 08:38:12




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 06:34:32  
Pat..... ...I saw yer post earlier and still don't really have any answers. NO, yer genny reostat ain't the cause of your "no output".

I'm with you, sudden loss of volts output is usually a fuse problem ...but... could be a relay or switch contact problem.

Resistors and reostats are like lightbulbs ...poooff... and the smoke escapes and quit working. You do know electrial stuff all work on smoke don't you? You doubt? Once you let the smoke out, they quit working. (grin) ..... ..Dell

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ron,ar

09-05-2006 13:46:35




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 Dell you forgot the best part in reply to Dell (WA), 09-05-2006 08:38:12  
It is not just smoke, it"s magic smoke! You let the magic smoke out, presto-whammo, nothing works again. I had an instructor tell us years ago that all electronics work off one principle, PFM. PURE F_____Magic. That explained a lot:^)



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maplehillfrm,pat

09-05-2006 10:10:13




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 Re: soundguy,dell? portable genny electrical quest in reply to Dell (WA), 09-05-2006 08:38:12  
thanks dell, the last post went to the bottom so fast, and with the holiday weekend was not sure if it was seen, yea I believe they run on smoke, haha,, I didnt see any though, I will keep looking, what do you think about jumping that 500 ohm resistor??thanks pat



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Bob Jones

09-05-2006 08:21:33




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 06:34:32  
Not sure what kind of rig you got. Sounds like a combination generator and welding unit. I'm not familiar with those but my portable generator did the same thing when the control capacitor blew. It cost about $8.00 to fix and half of that was shipping. Good luck.



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maplehillfrm,pat

09-05-2006 10:13:21




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 Re: soundguy,dell? portable genny electrical quest in reply to Bob Jones, 09-05-2006 08:21:33  
thnaks bob, this is actually a big army genny that has a 220 hookup for my welder, so it is basically just a generator, I will look into the control capacitor, did you see any signs like black soot , or anything or was it process of elimination that sent you there, thansk pat



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Bob Jones

09-05-2006 13:21:22




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 10:13:21  
Nope it didn't look bad but on mine there ain't very many things it could be. I looked at a troubleshooting chart that came with the generator and that was given as a possible cause for my systems.



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souNdguy

09-05-2006 10:28:53




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 Re: soundguy,dell? portable genny electrical quest in reply to maplehillfrm,pat, 09-05-2006 10:13:21  
We had an old 70's era welder generator at work for about 13 years. there was a large resistive element that had a few ( 3 ) wire taps on it with spade terminals. It went down into the mostly covered up genny coils.... hard to see where it was goin. On occasion one of these terminals would come loose.. when it did.. nada.. no power.. no weld. I'm guessing it was aprt of the field control..

Soundguy

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