[69198] in North American Network Operators' Group
RE: UPS and generator interaction?
daemon@ATHENA.MIT.EDU (Dave Hilton)
Mon Mar 29 19:14:47 2004
Date: Mon, 29 Mar 2004 16:14:08 -0800
From: "Dave Hilton" <hilton@entelos.com>
To: "Mike Lewinski" <mike@rockynet.com>,
"Brian (nanog-list)" <nanog@confluence.com>
Cc: <nanog@merit.edu>
Errors-To: owner-nanog-outgoing@merit.edu
I had trouble like this years ago. Seems that some UPSes only recognize
sine-wave AC power, whereas some UPSes provice something more like
sawtooth or square-wave AC power.
Inserting a Variac (very inefficient) between the generator and the
sensitive UPSes fixed the problem.
Dave Hilton
SysAdmin
Entelos
Dum Spiro, Spero
-----Original Message-----
From: Mike Lewinski [mailto:mike@rockynet.com]=20
Sent: Monday, March 29, 2004 10:54 AM
To: Brian (nanog-list)
Cc: nanog@merit.edu
Subject: Re: UPS and generator interaction?
Brian (nanog-list) wrote:
> Does anyone know of a way to get a UPS to trigger a generator to=20
> 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=20
posting in case anyone else here can shed light on.... we had a power=20
event this AM. The transfer switch did it's magic and all was good...=20
Except for two new APC1400's- they failed once the batteries drained. I=20
triple-checked that they were on the right panel, played with=20
sensitivity, even tried daisy-chaining one off a good working 2200.=20
Nothing I did would convince the two 1400s they had power. Once the=20
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=20
problem :( Other models (even a couple non-essential lower-end, dumb APC
450s and 650s) didn't blink at the generator power.
Mike