[ale] OT: slow back-UPS

[Jeff Hubbs]

Look at the Liebert units; they have some that run on inverter all the
time.

- Jeff

On Fri, 2004-07-23 at 14:36, Cor van Dijk wrote:
> "Keith R. Watson" wrote:
> 
> > At 20:20 7/22/2004 -0400, you wrote:
> > >Greetings,
> > >I have several power backup units and they work ok with pc's. I also
> > >have a digital audio recorder,
> > >for which they do not work. It appears that the response time is too
> > >slow. All of the ones I have
> > >checked have a response time of 150 ms (or better they say), which is
> > >almost 9 cycles.
> > >Is anybody aware of faster ones or a way around this problem? The
> > >recorder takes only 30 Watts,
> > >so that should not be a problem. TIA.
> > >Cor van Dijk.
> > >
> > >_______________________________________________
> > >Ale mailing list
> > >Ale at ale.org
> > >http://www.ale.org/mailman/listinfo/ale
> >
> > Cor,
> >
> > There are different kinds of UPS's. See 02.04.3 of the UPS FAQ.
> >
> > http://www.non.com/news.answers/UPS-faq.html
> >
> > 3. What I call "true" UPS systems, those supplies that continuously operate
> > from an inverter. Obviously, there is no switchover time, and these
> > supplies generally provide the best isolation from power line problems. The
> > disadvantages to these devices are increased cost, increased power
> > consumption, and increased heat generation. Despite the fact that the
> > inverter in a "true" UPS is always on, the reliability of such units does
> > not seem to be affected. In fact, we have seen more failures in cheaper SPS
> > units. [ Note, though, that given the same quality inverter, you'd expect
> > the one that runs least to last longest. ]
> >
> > keith
> >
> > -------------
> >
> > Keith R. Watson                        GTRI/ITD
> > Systems Support Specialist III         Georgia Tech Research Institute
> > keith.watson at gtri.gatech.edu           Atlanta, GA  30332-0816
> > 404-894-0836
> >
> > _______________________________________________
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> > http://www.ale.org/mailman/listinfo/ale
> 
> Thanks Keith,
> There appears to be a whole lot more to a UPS than I thought. The search for a
> "true UPS" is on. In case you happen to know where I can get one I would
> appreciate to hear from you. The vendor list at the end of the FAQ is ten
> years old.
> Thanks again, Cor van Dijk
> 
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