One of our devs has his workstation plugged into a Cyberpower 1500VA UPS. When he came in this morning, everything was off including the UPS. When we turned it back on, it showed full capacity. I am unfamiliar with UPS's in general, but as a test, I unplugged it from the wall. It immediately shut off and so did everything plugged into it (a lamp as a test). The load was minimal when I performed the "test".
Is this expected? Or should I be able to unplug it from the wall and have it continue to supply power?
This may sound like a dumb question, but I don't know if there is some kind of circuitry that knows the difference between a power outage and unplugging it. Sorry.
31 Answer
Its job is to provide an uninterrupted power supply in the event of a power cut - which can eminently be tested by simply unplugging it.
If it doesn't do that, either the battery has failed or the unit itself has failed.
If the battery is more than 3 years old, suspect that first. If not, then send it for repair/replacement.
