Hi Glen, you may be interested.
(a comment to those who missed my previous posts, I am converting my welder from CC only, to CC and CV as well as selectable voltage range, with hopes to make it into a plasma power supply also).
After a little test run, I am putting together what will become the final rectifier and controller. I connected it with half of the secondaries connected as Wye (which, as I know, makes too much voltage).
After a lot of messing around, I am finally able to properly control OCV with a pot. That was a very happy moment!
My plan for tomorrow is to put together a rudimentary control panel (on/off, voltage and current control pots) and connect rectifier to welder outputs. Maybe even test some stick welding, in 3-4 days.
After that, I will try to make a reconnector to select between paralleled delta at 66 VAC, and sequence Wye at 220 VAC, using five 24 volt contactors.i