On Wednesday 30 April 2008 09:47:06 pm Patrick O'Callaghan wrote:
> On Wed, 2008-04-30 at 19:04 -0800, dwight at supercomputer.org
wrote:
> > On Wednesday 30 April 2008 01:00:32 pm Mikkel L. Ellertson wrote:
> > > Patrick O'Callaghan wrote:
> > > > I've had a UPS for at least the last 5 years (not the same
> > > > one) since power here is iffy even at the best of times. At
> > > > the moment I use an APC 1KVA unit. Unfortunately for reasons
> > > > I can't quite fathom my machine still doesn't survive power
> > > > outages even though the other stuff on the UPS (monitor, DSL
> > > > modem, router, printer) all do. I've checked the earth
> > > > (ground) connection and it looks OK, and the UPS light shows
> > > > green, i.e. all OK. The UPS is only a year old so it can't
> > > > be the battery.
> > > >
> > > > poc
> > >
> > > It could be the time it take to switch between line power and
> > > battery. It tends to be more common with fully loaded power
> > > supplies. There is not enough reserve in the filter caps or
> > > something to carry over the loss of a cycle or two. A UPS that
> > > will also compensate for line voltage tends to have less of a
> > > problem with this because there isn't the abrupt changeover.
> > >
> > > Mikkel
> >
> > I concur. Also, my experience with APC UPS's is that they
> > generally didn't become real UPS's until their SMART model (and
> > above) series, starting with the (older) 1400 and now the 1500
> > smart model series. The lesser ones just didn't have the proper
> > electronics.
> >
> > It's not clear to me which model you have. But generally price
> > is a good indicator. I always avoid the cheap UPS's.
>
> It's a Back-UPS RS/XS 1000, and in fact it didn't fail. It was my
> own fault for having the cpu plugged into one of the non
> battery-backed sockets.
>
> poc
Heh. Thanks for posting the solution to this mystery. Anyone with
enough experience can relate their own similar stories. It happens
to us all.
-dwight-
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