On Thu, 2 Oct 2008 21:00:43 -0700 (PDT), Vernon
wrote:

While I was gone the VFD came for the KBC mill. So the family machine
shop seems to be coming together quickly. I'm reviewing the technical
instructions on the inverter. There is mention of some additional
components such as a "reactor" in case the input power is out of
balance by more than 3% plus a radio noise suppressor. The latter
probably isn't needed. But I think the "reactor" may apply to us.
Since we're in a rural location power is pretty dicey. In fact,
recently, one leg of the 220v supply died completely. I don't know
what that would do to an inverter. But at $350 a pop I don't wanna
find out. Even with my poor math one leg is a tad over 3% if I'm not
mistaken.

Unless your VFD is very unusual, it was designed to run on 3 phase
power, but will run on single phase with some derating. You're
planning on connecting it to single phase, which means one of the
VFD's power inputs will be unconnected -- a 100% imbalance -- and a
reactor isn't going to help that situation.

I've purchased line reactors from these folks, you may find useful
information in their technical articles.
http://www.transcoil.com/

--
Ned Simmons