[Nut-upsuser] Access to internal UPS logs?

[James Harper]

> -----Original Message-----
> From: Arjen de Korte [mailto:nut+users at de-korte.org]
> Sent: Wednesday, 17 September 2008 17:35
> To: James Harper
> Cc: nut-upsuser
> Subject: Re: [Nut-upsuser] Access to internal UPS logs?
> 
> Citeren "James Harper" <james.harper at bendigoit.com.au>:
> 
> > It's a brand new UPS (3 weeks old) and has failed this way twice,
both
> > after hours. No other equipment at the same site was affected
indicating
> > that there were no power problems.
> 
> In that case, create one at a time convenient for you. Make sure there
> is sufficient load connected and throw the circuit breaker on the
> input. If it keeps on running, the batteries are not the problem.
> 
> > upsc says this about the battery state:
> >
> > battery.charge: 100
> > battery.charge.low: 10
> > battery.charge.warning: 30
> > battery.temperature: 34.9
> > battery.type: PbAC
> > battery.voltage: 54.6
> > battery.voltage.nominal: 48.0
> 
> Unfortunately, neither of the above will tell anything about how well
> the unit will behave under load. Bad (high ohmic) connections of the
> battery terminals or a failure in the inverter circuit will only
> surface if the UPS must supply power. That's why one should never skip
> periodic battery tests. Ideally, these should be initiated by an
> operator, so that if the test fails there is someone at hand to fix
> the problem (or at least reboot the system).
> 

What you say is correct, but the failure mode is that the UPS stays on
but turns off its outputs. During the failure, all monitoring continues
to report that everything is fine - battery at 100% capacity, input
voltage at ~248, output voltage at ~248, temperature at ~32C. The only
thing that changes is that the output load changes from ~10% to 0%,
which is expected if the outputs are turned off.

I would have expected that a battery failure combined with an input
failure would have resulted in the UPS shutting down, and then starting
up again once the input failure condition sorted itself out. As it
happens though there was no input failure condition long enough to cause
any problems with any other equipment, although I understand that a UPS
will respond to even short conditions like that.

Or maybe it is possible that the UPS could detect a very brief (ms)
input failure, try to switch over to battery, find the batteries broken,
and reboot in a "I'm not working because my batteries are broken" mode?
According to the onsite person, none of the LED's indicated a failure
condition though...

HP are sending a new unit anyway and it should be here tomorrow. I hope
we don't find anything stupid like someone forgot to connect the
batteries...

Thanks

James