What kind of converter are you using?

Many people don't realize that converters don't make sense any more in today's day and age. You should be using VFDs (variable speed drive).

The benefit is single phase in, 3 phase out, variable speed and if you get the right one dynamic braking - - sure is nice to have the mill stop spinning in 1 revolution without mechanical assistance. They can be had cheap on ebay.

I have 4 vfds in my new shop.

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I'm using the electronic type.... I couldnt see running
a big motor to run my small motor. My old electronic
one was too small to handle the HP but this one will
handle a motor twice the size of mine... this one
also starts much faster than the old converter