THC upgrade Miller Spectrum 375 wiring

[TinWhisperer]

I only have a 375 so I can’t physically verify for the 625

When I look at the wiring diagrams for each power supply they seem virtually identical.

This is a screenshot from the 625 manual wiring diagram.

Miller Spectrum 625 X-TREME Owner's Manual (Page 37 of 44) | ManualsLib

Here’s another link from that same topic with a customer who successfully wired his Miller to run with the THC it has some pretty clear photos

Miller 375x wiring

I wired my 375x and did a first test run. Fantastic results compared to before the z-axis. Here some pictures of the modification. I followed the suggestions in this thread above. (DISCALIMER: copy at your own risk!) [20210530_133642%20small] [20210530_133410%20small] [20210530_133402%20small] [20210530_133356%20small] [20210530_133115%20small]

Miller 375x wiring

Just thought I’d add something here. Turns out my 375 Extreme has the lugs reversed from the pics so had to swap the leads. Good thing I checked the continuity before I buttoned things up. But it worked great and really like the results

Here’s a good tidbit on some of the machines those lugs are reversed…

Of course why would you want the terminals in 2 3 4 order when you could have them in 2 4 3 order, thanks miller?