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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
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