[Nut-upsuser] Delayed UPS shutdown

Gene Heskett gheskett at shentel.net
Thu Jan 2 13:56:52 GMT 2020

On Thursday 02 January 2020 06:43:42 Roger Price wrote:

> On Thu, 2 Jan 2020, Harlan Stenn wrote:
> > On 1/2/2020 3:12 AM, Roger Price wrote:
> >> On Wed, 1 Jan 2020, Gene Heskett wrote:
> >>> But I should preface this with the fact that I have a 20kw nat gas
> >>> fired standby with a sub 10 second startup time in the back yard.
> >
> > My understanding is:
> >
> > If there is a power outage, there comes a point where the UPS says
> > "I have N minutes of power left", and when N is small enough we want
> > upsd to shut down the boxes.  As soon as that decision is made,
> > boxes will be told to power down, and boxes MUST power down.
> >
> > If line power comes back at this point, but before the UPS runs out
> > of power, the UPS MUST power cycle, as the boxes will only power up
> > when they see the power turn off and then turn on again.
> >
> > Anything else, and while the UPS may not *need* to power down, if it
> > doesn't turn off/on then the boxes won't know it's OK to power up
> > again.
> >
> > Or am I misunderstanding something?
> The key factor here is that Gene has a 20 kW standby, and I assume, an
> automatic transfer switch.  In his case, the wall power supply is
> restored within 10 seconds. He never gets to the point where the UPS
> says "I have N minutes of power left".
> Gene, do your rotating machines stop during the time it takes the
> standby to be ready to take over?
Generally yes, because that 5 seconds will have killed any power to the 
motors, and the computers that drive them, except this one, do not have 
ups's.  Often the computer will be crashed, and won't recover w/o a foll 
powerdown.  Normally the machines will do a clean, no broken tools stop, 
so its not been something to worry about. The part will usually not be 
toast as the one time it happened with me standing there, it did put an 
extra gouge about 2 thou deep in a non-critical area. Part was 100% 

Nothing has run since late Sept., as my diabetes finally caught up to my 
ticker after 30 years, I had a heart attack and they've fixed it as good 
as they can, bunch of stents and a new aortic valve so I'm feeling 
better than a year ago right now. A year ago I walked into the ER on a 
Sunday afternoon and said I thought I needed a pacemaker. Since my pulse 
was down in the low 30's, they didn't argue with me. I asked the surgeon 
how long it would last, he chuckled and said the battery was good for 10 

The missus, not so much, COPD, down to around 70 lbs. Not a lot of time 
left IOW. She'll be 80 next month & I'm already 85.

This makes twice I've made that guy in black with the scythe blink. I had 
a pulmonary embolism when I was 79, and the survival rate for those is a 
tad less than 2%. Maybe he's just not ready to put up with me? :-)

> Roger
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Cheers, Gene Heskett
"There are four boxes to be used in defense of liberty:
 soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
If we desire respect for the law, we must first make the law respectable.
 - Louis D. Brandeis
Genes Web page <http://geneslinuxbox.net:6309/gene>

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