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Tool Talk Discussion Forum

three phase welder on single phase

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willyd

06-29-2005 05:45:51




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Is there any way other than a rotary phase converter to run a three phase welder on single phase. I got an old lincoln Idealarc 325




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buickanddeere

06-30-2005 12:01:58




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 Re: three phase welder on single phase in reply to willyd, 06-29-2005 05:45:51  
Most large welders are hooked to 480 or 600V three phase power receptacles. And are only using two of the three lines which is, single phase. Check inside the welder before purchasing a phase convertor you don't even need. You may only need a 240 to 480 or 600V transformer. My Father-inlaw watched a beauty of a AC/DC600V welder go for $20.00 at an auction because he didn't know.



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Dick L

06-29-2005 07:06:33




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 Re: three phase welder on single phase in reply to willyd, 06-29-2005 05:45:51  
NO but if I had one I would buy a five HP three phase motor and make a converter. Simple deal! You just hook your two hot single phase wires (thru a switch box of course) to two of the motor leads. You have to bring the five horse three phase up to speed before by belting a small single phase motor before you put power to the three phase motor. From the three phase motor you place the wires directly from the single phase connections to your welder outlet. Hook a wire to the third connection on the three phase motor to the third terminal of the welder outlet. With the five HP three phase motor spinning and then powered up, the five HP three phase winding will manufacture the needed third phase. I helped with setting up a tool shop to run on a 100 HP three phase motor this way where the light company would not run three phase. The shop had three Bridgeports, two lathes, two surface grinders, and an EDM machine. Your home made converter has to be of greater HP that all the three phase motors you want to run.

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buickanddeere

06-30-2005 12:05:45




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 Re: three phase welder on single phase in reply to Dick L, 06-29-2005 07:06:33  
Yes the rotary convertor does work and is cheap but it ain't pretty. The three phase load motors can not be fully loaded without overheating. The motors can not make full HP wihtout exceeding rated current as well. Something to keep in mind during the design stage.



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n9lhm

06-30-2005 08:10:41




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 Re: three phase welder on single phase in reply to Dick L, 06-29-2005 07:06:33  
Or do it correctly with two capacitors (one start, one run) and a relay and it will start itself and the phase voltages will be balanced. Brian



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