Al, you are right in the case of manual machines especially. However in my experience, if you are running a CNC from the phase converter, and you start or reverse another machine from the converter it can drop the voltage momentarilly just enough to cause your CNC to error out. It was happening to me with my 10 hp converter running a r2e4 Boss9 bridgeport. I was tapping parts in my manual machine and every time I reversed the spindle to back out the tap my CNC would drop out.
Doesnt happen with my 30 hp convertor though. The 10 hp was a home brew and worked well, but probably wasn't balanced just right. By the way, you can but a CD with plans for all types of phase converters and specs for proper capacitor sizes etc on EBAY for $10. or so. |