Miller XMT456 Help 6 Troubleshooting
Tue, 31 Aug 2021 09:34:20 GMT
Hoping someone can help me with this. The guy using it said he heard a pop, then it stopped welded, smelt burnt and it displayed HEL P-6 on the machine. I took the side panels off, see attached pictures. Currently wired for 460V, I checked the supply and it's coming out at about 481V.John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:I took the cover off the top, and the board that's up there is definitely cooked. A capacitor blew, and there's a resistor right by it that is now completely missing. I found a relatively cheap replacement ($250) for it, but I just was hoping to get some more insight on this. Do the boards usually fail on their own, or does something else usually cause them to fail? As far as I can tell by visual inspection, the rest of the machine looks pretty good, but I have no way to test the IGBT.John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:Originally Posted by EcondronI took the cover off the top, and the board that's up there is definitely cooked. A capacitor blew, and there's a resistor right by it that is now completely missing. I found a relatively cheap replacement ($250) for it, but I just was hoping to get some more insight on this. Do the boards usually fail on their own, or does something else usually cause them to fail? As far as I can tell by visual inspection, the rest of the machine looks pretty good, but I have no way to test the IGBT.
Reply:Originally Posted by DmaxerIf I were you, I'd go over to the Miller site, be sure to list the serial # and hope a technician there (cruizer?) can help you. Good luck.
Reply:Miller doesn't make those Technical Manuals available due to the high internal voltages.Google is your friend - search how to test an IGBT with a multi-meter. You'll want to check the 3-phase input power rectifier as well.PM me an email address.MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110Save Second Base!
Reply:For what it's worth to anyone who is interested, I took the IGBT's off and really couldn't figure out how to test them. I found a video on Google but my results were not consistent with the video. So I took my chances and just put the new board in and all is working great now.John 3:16(2) Miller Pheonix 456(2) Millermertic 252Dynasty 210DXHobart 210MVPDoringer D350 SA Cold SawScotchman 350LT Cold SawWebb 10x50 MillWebb 15x40 LatheGeka Bendicrop Ironworker
Reply:Originally Posted by EcondronFor what it's worth to anyone who is interested, I took the IGBT's off and really couldn't figure out how to test them. I found a video on Google but my results were not consistent with the video. So I took my chances and just put the new board in and all is working great now.
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