From: "Tarver Engineering"
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Subject: Re: (Avionics) How can this circuit produce an "inductive surge"?
Date: Thu, 3 Oct 2002 07:56:15 -0700
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"Richard VanHouten" wrote in message
> Peter Gottlieb wrote:
> > "Tarver Engineering" wrote in message
> > news:firstname.lastname@example.org...
> > > > >
> > > > > 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
> > for
> > > > emergency lighting, much more efficient than incandescent. I didn't
> > > the
> > > > series motor was the *only* test, did I?
> > >
> > > Well really, we were running big motor generator sets, to make 400
> > > (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
> > floresent
> > > lights.
> > Why would you run a static inverter to make one frequency of AC then use
> > MG set to convert to another frequency? Seems like a real kludge to
> > 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
> premium setup.
All the MG sets for mainframes I ever worked were running off the 60 cyccle
inverter at all times; these were CDC mainframes though.
> 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.