From: Richard VanHouten
Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Wed, 02 Oct 2002 01:43:59 -0400
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Peter Gottlieb wrote:
> "Tarver Engineering" wrote in message
> > > >
> > > > You do know that floresent ligting is far harder on an UPS than an
> > induction
> > > > motor, do you not?
> > > >
> > >
> > > So what? These are all 4 quadrant units. I use fl lighting on a UPS
> > > emergency lighting, much more efficient than incandescent. I didn't say
> > the
> > > series motor was the *only* test, did I?
> > Well really, we were running big motor generator sets, to make 400 cycles
> > (or 408 HZ IBM), off UPS 20 years ago. Running a motor with an UPS is
> > hardly an accomplishment.
> > To make the any load claim you would have to be able to drive all
> > lights.
> Why would you run a static inverter to make one frequency of AC then use a
> MG set to convert to another frequency? Seems like a real kludge to me,
> not to mention, a very noisy setup.
Well, if this is the product that my employer (then K/W Controls, Inc.,
now Piller, Inc.) marketed, the static inverter was a standby unit, and
the MG set ran off of mains except during a power failure. The 2 second
ride-through of the MG set was plenty of time for the inverter to kick
in, and your battery string would give you several minutes to shut down
your computers, or let your diesel generator kick in if you had a
The frequency would drop a bit during the transfer, but IBM's spec said
that was ok, as long as it stayed above (I think) 370 Hz.