A lot of the data center systems are engineered to a 15 minute up-time on
UPS, anticipating a 90-sec generator startup and stabilization period...
and some slack for failure to automatically start, requiring manual
intervention.
Similarly, I'm used to semi-annual commercial power failover tests, monthly
generator tests (I wouldn't argue with weekly) and monthly UPS testing
without failover.
I do NOT know what the power configuration is for SBN, so I'm not casting
stones here, but I'm familiar with a fair number of, and wide variety of
UPS/generator configurations. And, I can recall a situation with a hospital
some years ago, where a friend was their chief engineer. He did weekly
generator tests, and monthly failover tests. And when they had an actual
loss of commercial power, despite the frequent testing, his generator
failed to start. It can happen despite appropriate testing.
Gerry
On Thu, Nov 6, 2014 at 10:59 AM, Rodger R. Getz <rgetz@xxxxxxxx> wrote:
> Don't they have all the primary components on UPS systems? Their UPS setup
> should allow at least an hour on batteries in case of generator failure. If
> it's true that the backup uplink has no generator, that's a disgrace! The
> contract should have required that both uplinks have a minimum of 1 hour
> UPS and both have generators. Generators tests should be done weekly and
> UPS systems tested monthly. This shows some very weak links in the system!
>
> Rodger
>
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> > On Nov 6, 2014, at 10:12 AM, Gilbert Sebenste <
> sebenste@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > On Thu, 6 Nov 2014, Wojtowicz, David wrote:
> >
> >> You'd think switching to the backup facility would be somewhat of an
> automated process. (I don't know what it actually involves)
> >
> > It is and it isn't. You have to cleanly shutdown the primary uplink, and
> then spin up the backup uplink at the same time. Normally, this
> > process can be done manually, but quickly. The problem is when your
> > uplink that you are using goes down, and you can't communicate
> > with it. You have to shut that one off first, or else you
> > can get two uplinks transmitting to one bird, when the
> > primary comes back online...which is a bad situation. In that case, and
> I don't know how it's done, you have to manually
> > shut off the uplink you were using, and then quickly spin up the other
> > backup uplink.
> >
> > In this case, I completely understand why it takes them an hour and
> > more to do that, because they also need a little time to figure out why
> > they lost the uplink in the first place. The two issues now are:
> >
> > 1. Why did the generator on the primary system fail?
> > 2. The backup uplink, which they are on now, I think has no generator
> > backup, only commercial power. Please correct me if I'm wrong...
> >
> > Gilbert
> >
> >
> *******************************************************************************
> > Gilbert Sebenste
> ********
> > (My opinions only!)
> ******
> > Staff Meteorologist, Northern Illinois University
> ****
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--
Gerry Creager
NSSL/CIMMS
405.325.6371
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That feed on their velocity;
And little whorls have lesser whorls,
And so on to viscosity.”
Lewis Fry Richardson (1881-1953)
