On Sun, 21 May 2006 19:23:48 -0400, Ned Simmons wrote:

In article , says...
FWIW, the manuals don't always explicitly tell you if they can take single
phase power in. Leastways I couldn't that admission in the Mitsubishi
manuals but they both run fine on 220 single phase. They are recently
obsoleted drives though and manuals for newer drives may routinely address
the issue. A call to the manufacturer would probably be in order before
committing to buy an older, used VFD.

Mike


Yes, it's more the exception to find mention of single phase operation
in the manuals. Of the Allen-Bradley, Mitsubishi, and Yaskawa drives
I've used in the past couple years, only Yaskawa mentions single phase
operation, even though all would operate on single phase. In fact, in 20
years I've never run across a small VFD that *wouldn't* run on single
phase. If you ask the manufacturer, the usual recommendation is to
derate by 1/3 to 1/2 with single phase input.

Heed the advice to not buy a drive if you can't get a manual.

Ned Simmons

The Hitachi L200 that I mentioned elsewhere in the thread is specified
for either single- or 3-phase input. The manual is clear about that and
about how to hook it up for either.

The thing I wasn't sure about is whether the power rating needed to be
lowered for single-phase input. The seller researched it for me and told
me that either input phasing didn't change the output specs. I haven't
noticed any problems but haven't really stressed it to prove that.