On Sun, 11 Sep 2005 01:09:51 -0400, Ned Simmons
wrote:

In article ,
says...

"R. O'Brian" wrote in message
news:81kUe.22811$hp.4649@lakeread08...
Make sure the VFD of choice will run on single-phase. Some have phase
loss
detection which shuts down the unit if a phase goes down.

Randy

Is that a parameter that can be changed through programming?

It's a pretty unusual feature on small (10-20HP?) VFDs. In
20+ years of building and working around industrial
machinery I've never actually run across a small VFD that
wouldn't run on single phase.

Ned Simmons

Don't all VFD's work by converting DC to synthesized 3-phase AC?

With rectified 3-phase there is no need to store energy because
full-wave rectified AC never goes below 86.6% of peak line voltage.
With rectified single-phase, some capacitive storage is necessary so
there is always DC available to synthesize all three phases.

So, it would seem that any VFD should be able to run on single-phase
if sufficient capacitive storage is present.