We have several PowerFlex 4 drives around the plant.We had a
planned outage that the power company was going switch over to
another feed , after this switchover we had a lower voltage of
424 vac. After this we had several drives go out, no display, nothing. Of the causes possible ,which is the most possible?
1. The low voltage
2. Possibly the power company closing the 3 fuses one at a time,
about 20 seconds apart,causing a single phase condition.
We have Square D TVSS units on all the feeds.
Thanks in advance,
planned outage that the power company was going switch over to
another feed , after this switchover we had a lower voltage of
424 vac. After this we had several drives go out, no display, nothing. Of the causes possible ,which is the most possible?
1. The low voltage
2. Possibly the power company closing the 3 fuses one at a time,
about 20 seconds apart,causing a single phase condition.
We have Square D TVSS units on all the feeds.
Thanks in advance,