There was a power outage today at 11:57 UTC-8 caused by this:
We’re actually about a mile away from it, but as you can see it hit the end of the line, popped the top middle phase, and tripped the whole line we happen to be on. Everything was fine until 14:33 UTC-8 when our new Eaton 9355 installation decided to cut power to the protected load. The alarms it gave were simultaneous “Input AC Over Voltage”, “Utility Fail” followed by “DC Link Over Voltage”. We’re guessing the generator momentarily went outside of tolerance. We’re not clear why that would cause the UPS to shut off (isn’t this the whole point of the UPS?), but it refused to turn back on and kept giving “DC link over voltage”. Because we were offline at this point, we activated the external bypass on the paralleling cabinet to tie the generator directly to the server room distribution and get things back online ASAP. We called the Eaton support hotline and the tech advised us to reset the logic by cycling all the breakers open then closed, however the unit still failed to start citing the “DC link over voltage” alarm. We do have a 24 hour service contract for the unit, so someone is on the way to take a look at it.
[Nov. 23 00:49] Eaton took a look at the unit and was unable to duplicate the problem. The only difference is that it was supplied by utility power and not by generator as we do not wish to experiment without a dummy load and risk an outage. At this time the bypasses have been removed, the generator stopped, and the UPS is back online supplying power to the protected load. We will also have the generator looked at as we suspect the most likely cause of the trouble could be the voltage regulator losing lock or the electronic governor. The units we have are transformerless and the “DC link over voltage” error can be caused by a problem with the neutral reference point going out of bounds.
[Nov. 23 13:00] Our diesel mechanic will be replacing all of the injectors on our generator. One of them had a blown port due to water.
[Nov. 24 10:28] According to the news, the driver of the van dropped something. (Source: KOLO) West Huffaker Lane is 5 lanes wide, four travel and one center turn lane.
View Outage Notice Nov. 22, 2009 in a larger map