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Tool Talk Discussion Forum

3-phase generator

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farmer_ted

09-06-2005 18:24:56




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My buddy came across a 3-phase gen-set, but has no use for 3-phase. Can it be converted to run as single phase at 120/240VAC? The sticker says 5KW 270VAC 120Hz.




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Leland

09-10-2005 03:17:51




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
Don't screw this up this is what the fish people shock them with from the state they use a 3 phase for this and it beats using bait just wear rubber boots when it's running in baot.



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Kevin Bismark

09-07-2005 19:50:24




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
3 phase 270 volts 120 cycles, that is an odd ball, why the 120 cycles?? have you read the data plate right, could it be a 480/277 Wye generator at 60 cycles by chance, you got my attention with this one, if you find out for sure what it is and who make it post the information, would like to hear that..



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Bus Driver

09-07-2005 16:35:11




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
If it really is 120Hz, just forget it. Since it is only 5KW, running it half speed to get 60Hz will reduce output to very low wattage levels and screw up the voltage also.



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buickanddeere

09-07-2005 17:12:25




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 Re: 3-phase generator in reply to Bus Driver, 09-07-2005 16:35:11  
120hz is ok with incadescent lamps, electric heaters without induction motors, and any small tool motor with brushes.



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Kendall

09-07-2005 06:36:26




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
I use to work with 208 3 phase in a computer room. Between any 2 phases, you get 208vac, between any phase and neutral, you get 120vac. Maybe its just a matter of having the right wiring to a new/different circuit breaker box. Try to find the owners manual to see if the diagrams will drop any clues. Otherwise, perhaps some of the other post may offer ideas on conversion.



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buickanddeere

09-06-2005 22:44:48




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
Uh-oh, did that spec plate say 60Hz or 120Hz?



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RJ-AZ

09-06-2005 19:56:04




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
If it is a REAL Gen-Set it will have 12 leads that can be configured to most any type phasing or voltage. And if it is a REALLY real Gen-Set the info will be on the backside of an access plate on the main housing.



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Kevin Bismark

09-07-2005 19:56:16




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 Re: 3-phase generator in reply to RJ-AZ, 09-06-2005 19:56:04  
This has me thinking if it's line to line 270 volts you would have about 156 line to neutral, if it's Wye connected that doesn't ring any bells with me, if it was 277 to neutral it would be 480 line to line and at 60 cycles it would make sense, but still don't get the 120 cycles..



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buickanddeere

09-06-2005 22:43:17




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 Re: 3-phase generator in reply to RJ-AZ, 09-06-2005 19:56:04  
Yes they be wired so one phase is bucking another by 30 degrees angle to get 180 dgree power and single phase. Capacity drops to 57% if memory serves. If the generator is for portable use at a cottage, job site etc? Nobody is going to notice as they plug in 120V AC loads.



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Kevin Bismark

09-07-2005 20:02:51




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 Re: 3-phase generator in reply to buickanddeere, 09-06-2005 22:43:17  
Still sounds odd, the 57% is the one to remember with the open delta, in a pinch when you lose a transformer and make things work with 2 transformers, but the 120 cycles makes me wonder, has some odd balls but none like this one..



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NC Wayne

09-06-2005 18:59:58




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
I'd check with the actual generator manufacturer and ask them this question. While many generators are wound and wired for only three phase output, just as many can be rewired to put out single phase. The main thing is knowing if it can be done and if so exactly how it needs to be wired if single phase is possible. Otherwise like Bus Driver said the only way to get single phase is to run it through a transformer, and to get a transformer to handle it would most likely cost more than to buy a ready to go 5kw single phase unit.

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Bus Driver

09-06-2005 18:35:36




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 Re: 3-phase generator in reply to farmer_ted, 09-06-2005 18:24:56  
Yes, but the generator will have to feed to a transformer set- actually three transformers- with Star or Wye secondary. Not low cost by any means and finding the proper voltage ratings might be a challenge.



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