[98351] in North American Network Operators' Group
Re: 365 Main reason for outage report published
daemon@ATHENA.MIT.EDU (Deepak Jain)
Fri Aug 3 15:01:53 2007
Date: Fri, 03 Aug 2007 14:59:34 -0400
From: Deepak Jain <deepak@ai.net>
Reply-To: deepak@ai.net
To: "J. Oquendo" <sil@infiltrated.net>, Sean Donelan <sean@donelan.com>,
nanog@merit.edu
In-Reply-To: <20070803024049.GK6383@core.center.osis.gov>
Errors-To: owner-nanog@merit.edu
> Register4Less recently reported a power failure in Montreal where the
> return of a single cycle from the utility tricked generators into
> shutting down all three cycles, throwing the data center onto UPS until
> the batteries died. They did not report make of generator or of the
> board that failed them.
Many generator control systems (and transfer switches) do not monitor
all three phases for voltage, and stability (phase sync). Any of these
can cause a UPS to use its batteries (without charging) and not fire up
the generator. Or conversely, allow a generator to power down.
Its happened to lots of people in various places, but I am not going to
name-names.
DJ
