I have been asked to investigate a repeated occurrence in the UPS event log which is:
On battery power in response to frequency and phase difference
I have said that there isn't enough info to go by, but wondered if anyone had any pointers about what it might be?
The only noteworthy thing that has happened here is that I have had the PFC repaired, so our PF has gone from .9 - .95 to unity.
its a large industrial site, biggest motor is 120kW
