Miller Maxstar 150stl overheating

[BearWelding]

I just purchased a used maxstar 150stl and was testing it out and it overheated after running for about 2 minutes. I took it apart and found the fan was not working and tested on a 12v power supply and it was still not working. I've ordered a fan to replace that but I am just curious if anyone has run into this issue before. Nothing on the machine felt very warm so i'm not sure that replacing the fan will fix the issue. any info on if this is a common occurrence would be welcome

it has a 100% duty cycle running off 115 at 100a. I was running around 90a.

Thanks in advance!

[Sparkie1957]

I hope that solves your issue. I have a Maxstar 140 STR and the fan doesn’t run until you burn a couple of 3/32 7018 rods. The do an amazing job. Very smooth arc.


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[BearWelding]

I hope it solves my issue too. I was tig welding and ran like a 6" bead and it overheated. fan didn't run while welding nor when it overheated.

[Sparkie1957]

Might reach out to Miller for some tech help. I love my little Maxstar.


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[Sparkie1957]

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[BD1]

What process tig or stick ?
Your 100% duty cycle is for Tig at 100 amps

Stick is 35% at 100 amps

https://www.millerwelds.com/files/ow...o2245h_mil.pdf


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[snoeproe]

Duty cycle of the 150 stl is 100% at 100 amps when stick welding using 230v power only.
As stated, duty cycle drops to 35% at 100 amps when using 110/120 v power.
Another problem these machines have is the 120v power operation. A 15 amp 120v power circuit only allows the machine to achieve 70 or 75 amps max of weld output.
To get 90 or 100 amps of max weld output, you need to power the machine with a 20amp 110/120v circuit.

I was on a construction job one time and the company we were working for had a 150stl. Their thinking was we would use it for when we had to climb structural ladders to do things like hand rail modifications at elevation etc.
The problem was all the temp power on site was 15 amp 110v circuits. This made these 150stl machines almost useless. It was hardly enough power to light up a 3/32 7018.

[BearWelding]

yeah im talking about tig

[123weld]

do you have a working fridge/freezer in your shop?

[BearWelding]

You know i've just hooked a hose up that runs to my mouth under my hood and to the welder and i just blow on it really hard while im welding. which has solved the overheating issue. but now I keep getting dizzy and passing out. Any ideas for that?

[123weld]

lol,lol, id rate that an A- for creativity. when your new fan shows up, i think itll take care of the problem, id guess the 2 min you described, sounds about right for overheat , cuz id say my fan kicks on after the 1 min mark of somewhat consistant welding when on 110v @ 100amps

[Country Metals]

I have 2 150sth. The fan blew on the first one and I had the same problems. I changed out the fan and everything worked fine.

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