Miller integra 183

[Solo]

I have an old Miller integra 183. Must run it on max(10) all the time. I Use 0.8 . It welds too cold. Any thoughts? Thanks for any reply

 

[Jim Davey]

Too many things can cause that but a loose or burned out heavy current connection is a good place to start looking. That or the main contactor has burned contacts. If it's not that then check the switches, if they are ok the only thing left is the transformer and if that's failed the machine is scrap.

 

[Solo]

Thanks for a good and quick response . I opened it today. Looked like the Gobi desert. Blew it clean. Could not see anything that was burned. Smelled not burned either. Welding looks like bird ****. will go over all joints this weekend. Thanks again

 

[Jim Davey]

Take a close look at the rectifier. There are a load of little round diodes pressed into the surface of the aluminium plates (bottom right of your picture) look to see if any of the legs have melted off of the little press fit diodes.

 

[Solo]

Will try that. Got 30 cm of snow today , so I have to shovel my way to the garage first. Thanks again appreciate it!

 

[NotANormalCoder]

Looking at the picture, this is a 3 phase machine. Are you sure it's correctly wired to a 3 phase supply? If so, check for 3 live phases where they enter the machine. If they are all there, turn off at mains and check for continuity across each pair of main contacts (From top to bottom). If all is well here, take Jim Daveys suggestion and check the main rectifier. Also worth looking at the connections to the voltage switch. It only takes 1 phase to be missing for you to get a rubbish weld. Never assume that because the fan runs and the wire feeds, that you have all three phase present and correct!!!
Dave

 

[Solo]

Will be checking if the three phase are present and correct. Thanks again