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[Rilniceguy]

Yes i tied all three together

[Rilniceguy]

Haven’t checked forum in a while. Sorry and thanks for the link, it works. As u know i have the whiteface models, are u saying i could try your mod? Btw i only need up to1/4” welds.

[Rilniceguy]

You mean you no longer had the three legs coming out of the output side of the contactor tied together?

[Rilniceguy]

(45uf/leg)

[Rilniceguy]

Oh sorry jjohn76 yes those caps on top are the “phase” caps. ( i have two cp300’s)on that machine i put them on top. Btw 45uf seemed to work the best and with no hum. How about yours?

[Rilniceguy]

Wow. Amazing. I wonder, how much better do they run on three phase?...

[Rilniceguy]

These old Millers really lay down some mean beads. Its seems like i can run a fillet weld on 1/4” at 200 amps in spray transfer easier than i can run a test bead on 1/8” at 140 amps!

[Rilniceguy]

Up here in metro detroit those old millers and aircos can be found for $100,$200 here and there

[Rilniceguy]

Well no need for adding a reactor. The cp300’s already have one from the factory. But i did do Henions mod on my Airco shown above, the one that uses the slope coils as reactors and it works great. I tried making my own reactor like he did and i think the slope coils made for a flatter, better bead....

[Rilniceguy]

Sorry… no the caps on top are for smoothing the arc. But i do have the “phase” caps mounted lower(cant see them on pic)

[Rilniceguy]

And restored this old tank(millermatic mwf-xxx)

[Rilniceguy]

Also converted this airco(cp250ts)

[Rilniceguy]

144,000 microfarads worth of capacitance per Scott Henions suggestion dramatically smoothed out the arc....

[Rilniceguy]

[Rilniceguy]

Thank you all for the info!
i think i will just stick with my cp-300 ‘s
that i converted to single phase. Only got excited brcause its newer technology. The cp300’s are monsters even when converted.