Aid fixing a Miller XMT 304 CC/CV

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Bob F 15 years ago

I just bought what seems to be a non working XMT 304 CC/CV. After connecting up the 240V AC to the black and white input leads, with ground on the green lead, and the red lead insulated, powering it up produces nothing. No display or lights at all. My understanding of this unit is that it auto detects the 240/480 V single phase or 3 phase.

I just downloaded the manual, and will be studying the schematics for voltages I might check to locate the problem. So far, all I know is that the 240V AC gets through the power switch.

I am just asking at this point if anyone has or can recommend any additional diagnostic information that might be useful.

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Snag 15 years ago

Did you try connecting the red and black leads to 220 and the white to neutral ?

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Ignoramus3982 15 years ago

Some of those welders, counterintuitively, use a different set of terminals for 240v input. Try white and red or black and red or at least double check the manual.

304's are known to be blaky and expensive to repair. i

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Rick 9 years ago

replying to Bob F, Rick wrote: I have the same problem, the machine was originally used on an industrial site in 480 3 phase mode, i hooked it up for 220, following the procedure in the manual. No display. Although two small LEDS are lit up on the front board. Now this welder was out of service when i got at it and I have no idea as to what the problem was or if there were any codes. My question was whether you had any luck?

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MIKE WHITE 7 years ago

replying to Snag, MIKE WHITE wrote: THERE IS NO NEUTRAL required for this machine as it is not a 115 volt machine do not do attempt to use a NEUTRAL on connect to this machine,,,,,the black and white leads are for single phase operation and if you have 3 phase you can connect the RED lead to the third leg of the 3 phase for added power capability,,,,, this is an AUTO LINK machine and will automatically determine the voltage and adjust itself, for 220 230 240 --- 440 460 480 and some of these machines will run on 575 if so stated on the name plate,

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MIKE WHITE 6 years ago

replying to Snag, MIKE WHITE wrote: THERE IS NO NEUTRAL required for this machine as it is not a 115 volt machine do not do attempt to use a NEUTRAL on connect to this machine,,,,,the black and white leads are for single phase operation and if you have 3 phase you can connect the RED lead to the third leg of the 3 phase for added power capability,,,,, this is an AUTO LINK machine and will automatically determine the voltage and adjust itself, for 220 230 240 --- 440 460 480 and some of these machines will run on 575 if so stated on the name plate,

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Aid fixing a Miller XMT 304 CC/CV

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