Yesterday my old blue MillerMatic wasn’t happy. I was tag welding a metal frame then it started making a really loud electrical humming/buzzing noise. The fan came on and wouldn’t shut off. It was sending a small amount power to the electrode/lead (was arcing without the trigger being pulled) and the power plug/cord got really hot.. started melting the plug. Ground Clamp was pretty hot too. But didn’t trip the breaker. Obviously I shut everything down and unplugged it.. Haven't opened it up yet to look. Serial Number: JE744561 - Do y'all have any ideas what might cause this? Is old faithful a goner? TIA Last edited by TAC1FAB; 3 Weeks Ago at 02:50 PM.
Reply:
Originally Posted by TAC1FAB
Yesterday my old blue MillerMatic wasn’t happy. I was tag welding a metal frame then it started making a really loud electrical humming/buzzing noise. The fan came on and wouldn’t shut off. It was sending a small amount power to the electrode/lead (was arcing without the trigger being pulled) and the power plug/cord got really hot.. started melting the plug. Ground Clamp was pretty hot too. But didn’t trip the breaker. Obviously I shut everything down and unplugged it.. Haven't opened it up yet to look. Serial Number: JE744561 - Do y'all have any ideas what might cause this? Is old faithful a goner? TIA
Reply:Ok thank you
Reply:I was thinking a short somewhere or a bad diode creating a shortMiller Multimatic 255
Reply:If the incoming power started smoking and didnt trip I might be concerned about the wiring?www.urkafarms.com
Reply:May have a compound cause such as a shorted weld output diode as Louie1961 stated and one or more arced closed contacts in the main contactor as shovelon mentioned.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110
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Reply:
Originally Posted by TAC1FAB
Yesterday my old blue MillerMatic wasnt happy. I was tag welding a metal frame then it started making a really loud electrical humming/buzzing noise. The fan came on and wouldnt shut off. It was sending a small amount power to the electrode/lead (was arcing without the trigger being pulled) and the power plug/cord got really hot.. started melting the plug. Ground Clamp was pretty hot too. But didnt trip the breaker. Obviously I shut everything down and unplugged it.. Haven't opened it up yet to look. Serial Number: JE744561 - Do y'all have any ideas what might cause this? Is old faithful a goner? TIA
Reply:
Originally Posted by Oldiron2
How long was this going on before you could shut it off? When you do open it up, please take some good pictures of any inside components that appear damaged to any degree, and post them here, if possible.
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Reply:I took the cover off and really didn't see anything out of the ordinary. Except for in the first photo I found a small aluminum washer on the bottom of the machine.. and the fan motor is covered with grinder dust.. I would expect that's normal. I there is a repair shop fairly close to me in Sacramento I'm going to take the welder to. I talked to the guy there yesterday and he said it's well worth looking into and they can get parts for repair.
Reply:Connected for 200V rather than 230?I predict one or more shorted output rectifier diodes that heated the heat sink to the point the temperature switch opened shutting the unit down.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110
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Reply:
Originally Posted by duaneb55
Connected for 200V rather than 230?I predict one or more shorted output rectifier diodes that heated the heat sink to the point the temperature switch opened shutting the unit down.
Reply:I'd presume OCV (Open Circuit Voltage) for each setting would be higher than spec. Set up for 230V will likely require getting used to a "new" machine.The resulting higher OCV may have shorted one or more of the output capacitors. Something to investigate.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110
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Reply:
Originally Posted by duaneb55
I'd presume OCV (Open Circuit Voltage) for each setting would be higher than spec. Set up for 230V will likely require getting used to a "new" machine.The resulting higher OCV may have shorted one or more of the output capacitors. Something to investigate.
Reply:Check the manual for the proper use and settings for those jumpers.The sharpie scribbling of "200" and "230" don't exactly look official to me.Century buzzbox that I learned on 40+ years ago (was Dad's)Crappy Century 110volt mig 70 amp pigeon pooper.Lincoln Idealarc TIG-300
Reply:
Originally Posted by bead-boy
Check the manual for the proper use and settings for those jumpers.The sharpie scribbling of "200" and "230" don't exactly look official to me.
Reply:
Originally Posted by bead-boy
Check the manual for the proper use and settings for those jumpers.The sharpie scribbling of "200" and "230" don't exactly look official to me.
发表于 2022-9-16 15:52:30
