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UPS reporting problems with Phase Difference and Frequency

Johno12345
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
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    its traditional, with stages of capacitors switched in and out with contactors. 


    The site is full of inverter drives, and we do have a grid tied PV array too, but its been in for a couple of years. 


    The sensitivity can be changed on the UPS, I think ill just do that regardless and see how it goes. 


    There is also a MEM surge protector on the dis board that the UPS is connected to, and thats showing its status as working.
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    its traditional, with stages of capacitors switched in and out with contactors. 


    The site is full of inverter drives, and we do have a grid tied PV array too, but its been in for a couple of years. 


    The sensitivity can be changed on the UPS, I think ill just do that regardless and see how it goes. 


    There is also a MEM surge protector on the dis board that the UPS is connected to, and thats showing its status as working.
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