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Implement Alley Discussion Forum

Portable generator over-voltage

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supergrumpy

09-27-2007 11:57:37




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just bot 1985 8hp b/s motor with Pow'r Gard generator head attached, motor runs like a champ but seller said the unit did not generate, re-flashed the wiring and it really lights the bulbs now, 219v coming out of the 120v sockets

usually thats means overspeed but seems to be running at right speed (1800rpm on the rotor), if I slow it almost to an idle I can get voltage down

Baldor bot Pow'r Gard in 2000 and I cannot find manuals or IPL, inside the doghouse are 3 chips plus 1 chip, not sure what they do but I'm guessing the 3 might be rectifier and single might be circuit breaker

where can I get parts or wiring diagram??

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Oldmax

09-28-2007 05:47:47




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-27-2007 11:57:37  
Sounds like that gen has a voltage reg built in If that is case you have a reg out . Is this a 4 pole or 2 pole gen , 1800 RPM or 3600 RPM gen .if it is a 1800 RPM & you are turning it 3600 RPM then you will get 200 + volts out of it . if you have a direct coupling on B/S engine gen is turning 3600 RPM .



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supergrumpy

09-28-2007 06:51:31




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 Re: Portable generator over-voltage in reply to Oldmax, 09-28-2007 05:47:47  
gen head label says 1800 rpm 2kw 120v, cleaned the carb on the 8hp b/s last night and got engine to run smooth at fairly low rpms but voltage still too high

my Kill-a-Watt meter only goes to 125v and I don't want to blow it out so cannot check rpms on motor until I get the voltage down, if that big engine was running 3600 rpms it would be screaming so I don't think its overspeeding

traced most of the wires and looks to be very simple design, only 2 leads going to 120v plugs so full 2kw should be available to the plugs

thinking of wiring a stout variable resistor into slip ring circuit as temporary fix

unit is heavy duty and hate to toss it in the scrap

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El Toro

09-28-2007 05:45:45




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-27-2007 11:57:37  
Call this number in VA. They may have a wiring diagram. Hal
1-800-816-4555



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supergrumpy

09-28-2007 08:21:05




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 Re: Portable generator over-voltage in reply to El Toro, 09-28-2007 05:45:45  
they don't work on portables anymore

referred me to westmart

thanks anyway



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Solid Junk

09-27-2007 13:18:32




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-27-2007 11:57:37  
I just got back last week from a training class at Baldor Generator. Call (920) 236-4200 and ask for a service tech. If that doesn't work ask for Mike Moore. He taught the class and is very knowledgeable. It sounds to me like your gen. is just set up to make 220v, but I am just a generator beginner.

Joe



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supergrumpy

09-27-2007 16:29:02




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 Re: Portable generator over-voltage in reply to Solid Junk, 09-27-2007 13:18:32  
might have to give them a call

unit is labeled 120v, the 3 black things turned out to be full wave bridge rectifiers NTE5327, one seems to be hooked to an unmarked plug (might be 12v feed), all other plugs are clearly marked 120V

can't figure out why there are 3 of them, dc for energizing the rotor usually only needs one



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Gerald J.

09-28-2007 07:49:48




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-27-2007 16:29:02  
The NTE parts are not factory originals, they are replacements. So it sounds as if the circuitry has been cobbled.

Gerald J.



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supergrumpy

09-28-2007 08:17:09




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 Re: Portable generator over-voltage in reply to Gerald J., 09-28-2007 07:49:48  
A+B+C leads from stator go to the 3 NTE rectifiers, bunch of jumpers between the pins but looks like this all involves the 12v section, don't care about that

2 black stator leads feed 120v plugs

red leads go to a SDNV 20/06(?) half wave rectifier for slip rings to rotor, that seems to be it, no obvious voltage regulator to cause excessive voltage

this kinda has me stumped right now so just might tear it apart for a look see, been doing that since I was about 4 years old anyway

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Gerald J.

09-28-2007 13:57:56




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-28-2007 08:17:09  
But it could be the 12 volt section is what excites the field and needs controlling. But first you have to get it down to 1800 RPM. Find an electric clock with a syncronous motor and get it to running that at 1 minute per rotation of the second hand, and you will be at 1800 RPM. Then find the rest of its problems which appear to include cobbling.

Gerald J.



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supergrumpy

09-28-2007 16:51:01




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 Re: Portable generator over-voltage in reply to Gerald J., 09-28-2007 13:57:56  
sucess!!

I put a new air cleaner on and tweaked the carb mixture till she purred, voltage was still high so I lowered rpms just about to the end of the governor adjustment, voltage was low enuf to put my kill-a-watt meter on

backed the adjustment off until I had 60.2hz, voltage was 129.7v, good enuf for me, watched it for about 10 minutes under various loads and she held, even the 12v section works @15.7vDC, I have never seen an engine on a generator run that slow

thanks to all of you for the help

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buickanddeere

09-30-2007 18:14:54




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 Re: Portable generator over-voltage in reply to supergrumpy, 09-28-2007 16:51:01  
For 60Hz on a two pole machine, 3600rpm. Four pole, 1800 rpm. Six pole, 1200rpm. Eight pole, 900rpm. Ideally the unloaded fast idle rpm should set up a notch to approx 62Hz. This will get the frequency & voltage closer to the ideal 60Hz at 1/2 to full load. That engine will last a long time at 1800rpm if taken care of.



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