In article ,
says...


Ned,
Why are small of the smaller VFDs rated for single phase? I do know that the
used VFDs that are rated for single phase seem to be going for a premium.
Are you saying that any smaller VFD will convert single phase to 3?


Did you mean to say "Why are *some* of the smaller VFDs
rated for single phase?"

I can only speculate why some mfrs don't put single phase
ratings in their literature - perhaps they perceive it as a
small and potentially troublesome market. If you actually
ask the applications guys they'll give you a
recommendation, which usually involves derating the drive
by some factor, most often to 1/2 to 2/3 of it's three
phase rating. I personally think that derating a drive that
sees light and intermittent use by 1/2 is very
conservative.

Ned Simmons