Hi,
I'm new in the forum and I'm in need of some help trying to figure out an weird issue I had with one of my UPS's.
Yesterday I had a very briefly power outage in my home, one of those that you only detected because the lights briefly flick. During this, one of my UPS's completely shutdown (Salicru SPS One 1100 VA), turning off all the equipment I have connected to it.
Now the most weird part: I have a second UPS (Eaton 5E 1100 VA) in the same division, that is used on other equipment and it worked perfectly during the brief power outage.
My first thought was, "Ok, maybe the battery is dead and I didn't know", but after installing the UPS software and doing some tests the battery is working perfectly fine. Either I run the battery test via software or completely unplug the UPS it kicks battery mode and stays on, like it's supposed to.
So my question is simple: why did it turn off during this brief power outage? I haven't add any new equipment to it, so overload is also not a possible cause. I've used the exact same setup on the UPS for about one year and half and never had anything like this. Also, during this one year and a half I've had identical scenarios of briefly power outage and the UPS never turned off.
Hope you guys can give me a possible explanation, even if theoretical, because I'm clueless to what happened.
Thanks in advance.
PS: I've attached a printscreen of the power flow of the UPS that had the problem.