Hello, I just picked up a 70's IdealArc TIG 300 machine for real cheap with everything. Problem is that it is wired for 3 phase. Does anyone know about using a rotary phase convertor for this machine? Will it work? I just heard today that you can change some plate in the input for it can run on 230V instead. Does this mean I can acutally wire the machine single phase? Any suggestions would be greatly appreciated...also looking for a manual if anyone knows of a good place to get one. Thanks brokeSpokes
I realized that right after I wrote my post....haha, anyways, thanks for the input, I haven't heard of anyone running a welder off of a phase convertor. Did you figure the HP for the motor by the relationship, volts x amps\ 755watts? Is it possible to get the full 3 phases off the convertor or am I going to get like 66%?
Im running a Airco PhaseArc 350 off a 10hp RPC. Data plate says 90 amps input and Ive yet to have the arc waver due to low voltage.
Damned noisy though..all I had was a 3600 rpm motor...sounds like an GE turbofan winding up...
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Well, check out wikipedia article on phase converters:
there are some links there.
It is the job of a phase converter to take in single phase power and to provide three phase power.
Generally, the less is the power draw in kilowatts, compared to the idler's rating in kilowatts, the better is the quality of three phase power.
It is considered good to draw no more than about 2/3 of the nameplate rating of the idler (in comparable units). A welder may be tolerant of bad 3 phase power and you could push your power load even farther.
So, take the kW rating of your welder, say at 300 amps at 28v, it would produce 11,400 kW in the arc, figure in power losses, and it could draw, say, 15 kW. That's about 20 HP. So, then, your idler's capacity should be 30 HP.
If you plan on welding at lower amperages, as would normally be the case, you can get away with a smaller idler.
I have a phase converter with two idlers, totaling 17.5 HP. Two idlers, started one after another, make starting easier.
There are many ways of building phase converters. The main point to know is that they can be built very cheaply from used components and it is easy. It is not a complicated, risky project.
I know my response is a little late, but I hope you're still watching.
Use your machine's description or code number and look for a manual here:
I had worked on Lincoln's TIG assembly line in the 1080s and have never seen a 3 phase dedicated TIG machine; in fact, I have never seen a Linclon 3 phase transformer machine that had AC output. Are you sure it is 3 phase? You may not need a converter.