[Nut-upsuser] [Eaton 5S 1500] overvoltage shut down?

Charles Lepple clepple at gmail.com
Fri Apr 7 21:52:55 UTC 2017

>> last night we had what looked like a power spike and 3 machines plugged
>> into 2 Eaton UPS went down instantly. I heard the click the UPS makes when
>> it shuts the load on the ports and then shuts itself down (ie same thing if
>> I simulate with upsmon -fsd). The machines instantly came back, there was no
>> actual downtime, and the machine next to them which is not on the UPS never
>> went down.
>> This to me suggests some kind of overvoltage protection or something where
>> the UPS decided to shut down the load, but I'm quite puzzled by it as I'd
>> expect the UPS to actually shield the machines from it and certainly not
>> turn something off brutally like that..

I'm going to CC Arnaud's work address just in case they have any
additional information at Eaton, but for a variety of reasons, NUT is
not very strong when it comes to post-mortem analysis of events. If
the system running the NUT driver did not have a chance to log the
event before power went down, it is difficult to ascertain what

Is there an "upsc" dump for these units in one of the other
email/GitHub threads? (Feel free to redact all or part of the serial
number.) I don't know of any particular combination of settings which
might cause an immediate power-down for over-voltage, but it can't
hurt to check.

Arno: do these models keep an event log in EEPROM? Didn't see anything
in the MGE OPS protocol library on the NUT website, but I haven't had
a chance to poke around the Eaton website.

- Charles Lepple

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