UPS and generator interaction?

Mon Mar 29 19:00:11 UTC 2004

On Mon, 29 Mar 2004, Mike Lewinski wrote:

> But, on a minor note that probably won't affect your Symmetra but I'm
> posting in case anyone else here can shed light on.... we had a power
> event this AM. The transfer switch did it's magic and all was good...
> Except for two new APC1400's- they failed once the batteries drained. I
> triple-checked that they were on the right panel, played with
> sensitivity, even tried daisy-chaining one off a good working 2200.
> Nothing I did would convince the two 1400s they had power. Once the
> house power was restored they came back to life and look normal. I later
> learned that two of our colo customers with APC1400s had the same
> problem :( Other models (even a couple non-essential lower-end, dumb APC
> 450s and 650s) didn't blink at the generator power.

Check generator frequency.  If it has a mechanical governor, you may
need to replace it with electronic.

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