|The internals of a Phase-A-Matic static phase converter. Yes, that is cardboard.|
The 3 phase converter hooked up to the mill was a static 3 phase converter. Since a static phase converter only provides two of the three legs while running, the motor can't be run at full power. This approach was probably the wrong one, but I never noticed it until it broke. I've decided to go with a VFD for the mill over a rotary phase converter since a) they're actually cheaper right now, b) quieter, no moving parts, etc, and c) even though I doubt we'll use any of the extra functionality, it'll be there just in case. But mostly a). We'll see how that goes, but luckily right now mill downtime isn't going to affect our schedule so long as we can get it fixed by the end of the week.