On Friday 26 June 2009, cmg...@sover.net wrote:
>Regarding VFD's
>
>A poly phase input unit may be used even if single phase is the only power
>avilable.  The VFD must be sized a bit (1.5 -2 X) to accommodate the
>current through the DC rectifiers.
>The units I have (a Toshiba and two Siemens) all came by way of E-bay (New
>in box) and cost less than $50 each,  7.5 and 5 HP. List price would have
>been much greater.
>
>Just a bit of information.
>
>Cal

I will keep that in mind.  Being a CET, replacing the diodes with bigger stuff 
is no problem.  As a BCast engineer, I've dealt with some good sized hocky 
pucks here and there, the ones with flying anode leads & 500MCM cable. :)

>From that comment I also assume one can run lower powered motors from higher 
rated units & the only disadvantage  might be a slight loss of conversion 
efficiency?

-- 
Cheers, Gene
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
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