On Thursday, March 10, 2011 10:42:07 AM andy pugh did opine: > On 10 March 2011 15:24, gene heskett <ghesk...@wdtv.com> wrote: > >> 195A per phase on 3-phase input. Wouldn't it be 50% more on > >> single-phase input? (Or would it be 3x as much?) > > > > I don't have a mathematical basis, but it seems to me that to get that > > same 100 horse out of a single phase, one would have to factor in two > > things, > > I think we are discussing different things. > > I am saying that if a motor takes 200A per phase on 3 wires out of the > VFD and that power comes into the VFD on 2 wires, then the current in > the 2 wires will be more than 200A each.
Bring in the VFD, and of course you are right. The VFD may in fact have more amps per leg flowing but with careful design, can recover much of that which isn't actually used to turn the motor, I've seen that in the discussion so far. Which leads me to believe that the VFD's enhanced efficiency would pay for itself in reduced power draw over time. -- 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) <http://tinyurl.com/ddg5bz> As Will Rogers would have said, "There is no such things as a free variable." ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
