[69187] in North American Network Operators' Group
RE: UPS and generator interaction?
daemon@ATHENA.MIT.EDU (kwallace@pcconnection.com)
Mon Mar 29 14:10:13 2004
From: kwallace@pcconnection.com
To: mike@rockynet.com, nanog@confluence.com
Cc: nanog@merit.edu
Date: Mon, 29 Mar 2004 14:03:53 -0500
Errors-To: owner-nanog-outgoing@merit.edu
Brian (nanog-list) wrote:
> Does anyone know of a way to get a UPS to trigger a generator to start,
and
> to switch over to the generator power automatically or does this type of
> thing just not exist?
What Patrick said.
>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.
>Mike
If you are sure they were on an EP panel, then you may want to verify the
generator frequency/voltage.
We had an old 120KVA UPS that was VERY sensitive to frequency, and would
stay on battery while the generator was running, even if the frequency was
only off 1/2 cycle.
Regards,
Keith
