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?
Roger
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