UPS failure modes (was: fire at NAC)
robert at tellurian.com
Thu May 29 16:31:42 UTC 2003
At 12:27 AM 5/29/2003 -0400, you wrote:
>We're still here.
>Part of a rectifier in a Liebert UPS let loose, causing a momentary fire.
>That is, until the FM200 quenched it.
>Since there seems to be interest, I will post the post-mortem to the list.
I had a little 2000VA rackmount Liebert UPS catch fire in 1997 and another
new and improved Liebert model almost catch fire about a year later. Both
were operating well within specified input, load, and temperature
parameters. I haven't really trusted them since.I bought dual MGE UPSes
for our datacenter in 2002. I figured if E****s can flip them on and off
randomly and massively overload them all in an environment which is 95
degrees F, then they should hold up nicely for us when lightly loaded at 65
degrees F. :)
The reason for this rambling post is to ask if others have had similar
problems with other UPS brands. I think they should have enough fail-safes
built-in that they are never the CAUSE of an outage much less a fire! Based
on my experience and NAC's incident today, is that an unreasonable
expectation? I don't think manufacturers specify MTBF (mean time before
fire) figures for UPS units. What have others experienced as the failure
mode(s) for their UPS(s)? The static transfer switch should drop the load
onto line/bypass power immediately and shut down the inverter while
tripping the battery disconnect at the first sign of trouble - does this
work as designed and advertised most of the time or just some of the time?
Of those with UPS failure histories, what has happened in your situation?
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