[TheForge] VFD

[Darrell]

Under 5 HP VFDs will usually work on single phase input but you have to
de-rate them by about 30% unless they are rated for single phase/3 phase.
They work by rectifying the AC to DC and then converting the DC back to AC
at the frequency needed for the speed you want.
When you are using a 3PH in VFD on single phase, you are only using one bank
of the rectifiers to produce all of the current.
Darrell

----- Original Message ----- 
From: "Mark A. Pesetsky" <pesetsky at Princeton.EDU>
To: <theforge at mailman.qth.net>; "Knife List" <knife-list at kepler-eng.com>
Sent: Thursday, July 28, 2005 7:49 AM
Subject: [TheForge] VFD


>
>
> I was asked a question today that stumped me. Can a  3phase input inverter
> work on single phase as well? Or is it just 3 phase in that will drive the
> vfd?
>
> Thanks
> Mark
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