Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

RE: UPS and generator interaction?

  • From: Dave Hilton
  • Date: Mon Mar 29 19:16:19 2004

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

Dum Spiro, Spero

-----Original Message-----
From: Mike Lewinski [] 
Sent: Monday, March 29, 2004 10:54 AM
To: Brian (nanog-list)
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 
> 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.


Discussion Communities

About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home

Merit Network, Inc.