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  #11  
Old 09-30-2018, 06:48 PM
digger doug's Avatar
digger doug digger doug is offline
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Quote:
Originally Posted by Razorhunter View Post
I dont mind buying something cheap and fixing it. Do it all the time. But with these MM350 inverter welders I get worried about future problems, and costly ones at that. Especially after all the reading I did today.
I know its still an inverter, but I womder if I'd be better off with an XMT304 or XMT350 or even a CP302 single phase machine.
I dont know. I just want a good machine 250amps or larger that doesnt give me any problems.
Yup, me too.
However, that machine has enough electronics in it...it can launch the space shuttle....

I run an old xformer linde SVI 400 on a 40 Hp RPC.

Look at the PowCon inverters, they are supposed to be simpler inside
as well as more durable.
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  #12  
Old 09-30-2018, 10:19 PM
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Shade Tree Welder Shade Tree Welder is offline
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Location: Kankakee County, IL
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Quote:
Originally Posted by platypus20 View Post
I have had a Miller MM350P since day one, used regularly for 12+ years with absolutely no issues, I think its a great unit. I also have a Miller MM252, again a great unit. But to me there are great differences between the two. I’d gladly give up the MM252, before I’d give up the MM350P.
I agree with the GNAP, yes I had a bad board, warrantee replaced it no
charge they overnighted the board. Also the connections between the
boards need a coat of dielectric grease the originals like mine did not get
it at the factory they do that now to them.

So your "heat" error might just be a bad connection.

Call Miller Light Industrial and chat with them really nice guys.

They will answer your questions.
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  #13  
Old 11-29-2018, 06:06 PM
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monckywrench monckywrench is offline
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The Miller forums are where I go for Miller assistance. Plenty of factory and other highly experienced techs post there.

https://forum.millerwelds.com/forum/welding-discussions

For info on buying anything welding related Weldingweb forums are unbeatable.

https://weldingweb.com/

If you need a welder to last a lifetime they don't build those any more. If you need one to turn a profit before it dies, there are plenty available. It's sometimes hard to think of equipment being just a more complex consumable but industry treats it that way.

I would not buy a used machine with electrical board issues unless it was absurdly cheap (as in scrap price_, and then just to play with because I enjoy troubleshooting.

If you need it to make money, I'd buy a new MIG with a warranty and depreciate it over time.

Quote:
digger doug wrote:
I run an old xformer linde SVI 400 on a 40 Hp RPC.
I remember your RPC thread posts. Those and others inspired me to score a 15HP Rotary CNC rated RPC (cheap and lightly used so I didn't assemble one). I sized it to run my 450A MIG but right now it's powering my friends home shop since the rest of my gear is single phase. After back and shoulder surgery next year a lot more 3PH equipment shall follow me home. Everyone should have at least one healthy RPC because beastly 3PH welders are cheap as chips and three phase grinders, drill presses and machine tools sell for less if they don't run single phase.
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  #14  
Old 11-29-2018, 08:35 PM
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digger doug digger doug is offline
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Originally Posted by monckywrench View Post



I remember your RPC thread posts. Those and others inspired me to score a 15HP Rotary CNC rated RPC (cheap and lightly used so I didn't assemble one). I sized it to run my 450A MIG but right now it's powering my friends home shop since the rest of my gear is single phase. After back and shoulder surgery next year a lot more 3PH equipment shall follow me home. Everyone should have at least one healthy RPC because beastly 3PH welders are cheap as chips and three phase grinders, drill presses and machine tools sell for less if they don't run single phase.
Yes, after I built it, the amount of machines available to me opened right up.

I have since wired in a couple of transformers, switched in as needed.

I now make 440 as well as 575 vac 3 phase.

I could see your 15 hp unit mounted on an angle iron frame (maybe 2' x 3')
with casters, and a panel for the switches and outlets.
Hang the xformers on the back.

Sort of a portable power station.
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