millermatic 300

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Good Machines?Since it is 3 phase I would have to run it off a rotary phase converter.  Anyone weld off a rotary converter?How big of a rotary converter would you need to run this.  I have a 5 hp to run my table saw would that be enough?  Seems like it would take about 50 amp input at 208?
Reply:Ixnay on the 5hp electric motor.The 3-phase input power draw for that machine is about 19 hp (14 kw listed).  Adding about 35% for converter loss and you would be up to a 27 hp electric motor as your rotary converter, so call it an even 30 hp electric motor to account for some electrical losses.No WAY are you going to run a 30 hp electric motor at your house off of 230V single-phase power!  You couldn't even readily -find- a 30 hp 230V single-phase electric motor, if they even exist commercially at all.You are pretty much needing a small industrial (or really big residential) 3-phase generator .  Like in the 20-30 kw power range.Or a pretty big engine-drive welder with 3-phase power output.  A quick check on specs and a big Lincoln Vantage 500 unit (with a Perkins 4 cylinder 49 hp @ 1850 rpm turbo-diesel and 20 kw of rated continuous 3-phase generator power available and a rated 500A of welding power CC or CV at 100% duty-cycle) should have enough ooomph.  It's only 1450 lbs and $15k list.    The best laid schemes ... Gang oft agley ...
Reply:SIR,some of the big machines can be run onsingle, or 3 phase. have you checked thismachine to see if it has this option?good luck with your projects.wlbrown
Reply:The MM300 is a 3-phase only machine.  But it is listed as a 50 or 60 Hz capable 3-phase machine.  The best laid schemes ... Gang oft agley ...
Reply:Another big engine-drive that looks like it could power the MM300 is the Lincoln Vantage 400.It lists 17 kw continuous (19 kw peak) of 3-phase power available, and 400 A of CC or CV welding power at 100% duty-cycle.  It has a 32.7 hp 4 cylinder Perkins diesel engine, and only weighs 1230 lbs and lists at $12,856.  The Vantage 300 machines lookk like they don't quite have enough generator power available, at only 11 kw continuous 3-phase power output (12.5 kw peak) and 10 kw single-phase.Last edited by MoonRise; 10-23-2008 at 02:00 PM.  The best laid schemes ... Gang oft agley ...
Reply:Wow,  not gonna happen I guess.  Guess I'll just stick to the 3 phase  table saw and my single phase welders.  Thanks for the info though.
Reply:for less than 2 grand you can have a 30 hp rotary phase converter.check this site out.http://www.phaseconverter.com/#Rotary-Converternow if your house can power it, that is another question.the money you save by buying the 3 phase welder will be lost when you buy the phase converter.   so i would just get a nice single phase welder.