UPS electrical problem

[Ben Eisenbraun]

On Tue, Jun 29, 2010 at 09:54:52PM -0400, Dan Jenkins wrote:
>   On 6/29/2010 9:33 PM, Greg Rundlett (freephile) wrote:
> > Within the past week, when the household thermostat kicks on or off the
> > central A/C system, the PC shuts off instantaneously.
> 
> In my experience, that is usually a sign that the UPS battery is shot. 
> On any power twitch, the UPS switches over to the battery, which has no 
> capacity, and shuts everything off. How old is the UPS' battery? The 
> Backups Pro 500 is a fairly old model, as in Windows 98 era, if I recollect.

That would be my guess as well, but the other thing to check is that most
of the APC models have user-settable voltage cutover points for over/under
current events.  It's possible that if the under-voltage setting is too
low, then the UPS battery might still be good, and it's just that it's not
cutting over soon enough and the PC power supply can't survive the dip,
which causes the machine to reboot.

Last I looked, APC had Windows/Mac clients for checking/changing their
settings, and I think there are some 3rd party linux/UNIX tools that will
allow you to do it as well.  Network UPS Tools (NUT) is one I have used in
the past.

-ben

--
when i read about the evils of drinking, i gave up reading.
                                           <henry youngman>