Dear all, maybe not strictly a NUT question but I can't imagine a better place to ask, hope that's ok. 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.. has anybody seen stuff like that before? is this a faulty UPS? both units are new and from two different suppliers so I'm more leaning toward something I don't understand than faulty hw. thanks for any input, Spike -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.alioth.debian.org/pipermail/nut-upsuser/attachments/20170407/db3b5684/attachment.html>
and I should have probably mentioned... right after the event I unplugged the UPS's main and it went on battery, showing it had 11 mins worth of power left which is exactly what I'd expect on that load with full batteries. So the UPS "works" as expected, but then unplugging the cable would test a power dip, not a power spike, which si what I believe happened. thanks again, Spike On Fri, Apr 7, 2017 at 10:56 AM Spike <spike at drba.org> wrote:> Dear all, > > maybe not strictly a NUT question but I can't imagine a better place to > ask, hope that's ok. > > 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.. > > has anybody seen stuff like that before? is this a faulty UPS? both units > are new and from two different suppliers so I'm more leaning toward > something I don't understand than faulty hw. > > thanks for any input, > > Spike >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.alioth.debian.org/pipermail/nut-upsuser/attachments/20170407/03f64319/attachment.html>
>> 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 happened. 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