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Tool Talk Discussion Forum

power generator

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tooly

02-06-2005 21:24:56




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I recently bought a 5000 watt generator which I belted to my 8N Ford tractor.
It is equipted with a crude voltmeter.
My problem ( if any) is that when the generator is run at 3600 rpm , as required to produce 60 cycles/minute , the voltmeter shows something like 160 volts.
I would appreciate any ideas as to what if anything should be done .




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RandyB

02-07-2005 11:52:42




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
Couple of comments. You should have a solid state voltage regulator to adjust voltage. How did you determine that 3600 rpm was correct? That is correct for a 2 pole generator/alternator but many of the smaller generators are 4 pole generators that operate off of 1800 rpm. There is an old method of adjusting a generator to the correct frequency and phase by putting a 100 watt light bulb between the generator and your house 60 cycle current. If the light bulb is lit or bright, they are out of phase and frequency. Adjust speed of engine until light bulb nulls out and the generator and the house current will be exact same frequency and phase.

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RandyB

02-07-2005 12:03:40




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 Re: power generator in reply to RandyB, 02-07-2005 11:52:42  
make that 2 100 watt bulbs in series because if they are 180 degree out of phase, you will have 240 volts.



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gsmn

02-07-2005 13:34:57




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 Re: don't in reply to RandyB, 02-07-2005 12:03:40  
Do not do this! There is absolutely no reason to try to synch the generator with the power grid, and its DANGEROUS if you don't know exactly what your doing. The above directions for using light bulbs leaves a lot out. Use meters as previously advised



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RandyB

02-07-2005 15:02:24




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 Re: don't in reply to gsmn, 02-07-2005 13:34:57  
First this is a test to find the right frequency which requires the phase to be right. The most power that could feed the power grid would be limited to the wattage of the bulbs. After the RPM are found that produces 60 cycle then that is recorded and it is never done again. This can be done with small 4 watt bulbs in series. Of course the easiest way would be to have a simple reed type frequency meter or a dual trace scope to compare but most of those items are not found on the farm. The low power of the lights is not to parallel the generator to the grid but only to find the frequency.

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Vern-MI

02-07-2005 05:23:14




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
Does it have an integral inverter? That would produce about 160 VDC from a 220 VAC out or RMS(.707) X VAC = VDC. Otherwise some generators use a 160 volt exitation voltage.



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Bubba

02-06-2005 23:54:27




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
Put a load on it, 1500w milk house heater for example, and check the voltage with a DMM. Should be closer to maybe 125-130. If much higher, try to get a manual for it and see if it can be adjusted, some can, some can't.



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Bob

02-06-2005 23:30:41




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
If you are checking the voltage with no load, it will be that high with a typical generic modern alternator.

Load the generator to 1/2 to 3/4 of rated load, and then recheck the voltage. To verify the frequency, plug in an ordinary clock (with hands), and note how much it gains or loses in, say, a 10 minute period.



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kidbob

02-06-2005 22:06:02




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
Recheck the required RPM. 3600 is faster than most generators that I have worked with. If you can find someone who has a cycle meter that would be the best. Or you could plug in a motor and check the motor RPM with a tach. and compare to the motor label.



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buickanddeere

02-06-2005 21:38:45




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 Re: power generator in reply to tooly, 02-06-2005 21:24:56  
Measure the voltage and rpms with a known accurate meters. Some generator have a regulator that can be adjusted. Some just have a "dumb" recifier to feed DC to the slip rings for excitation. There maybe a variable resisitor somwhere or a trim pot. To vary the voltage and therefore the excitation current.



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