Nut upsuser - Oct 2022 - APC SmartUPS powercycles when power returns

On Tue, 11 Oct 2022, Andrea Venturoli via Nut-upsuser wrote:
> I've got an APC SmartUPS 1500: it's connected via USB and I'm
using the
> usbhid-ups driver. This used to work properly until recently.
>
> Now, when power goes out it keeps on going on battery potentially for
several
> minutes, but, the moment line returns, I hear a click and power is cycled
on
> the outlets (so every computer is rebooted forcily).
>
> I'm thinking about a hardware issue, but could it be that NUT is
instructing
> it to do so?
>
> All I see in the logs before the nasty event is: "upsmon[89989]: UPS 
> APC at localhost on battery".
> So I don't think a low battery status was reached and/or a shutdown 
> initiated.
>
> # upsc APC
> battery.charge: 100
> battery.charge.low: 10
> battery.charge.warning: 50
...
> ups.beeper.status: enabled
> ups.delay.shutdown: 20
I do not see a line such as ? ups.delay.start: 30 ? in the upsc output.  Is this
UPS capable of reacting to an early power-return and cancelling the shutdown?
> ups.firmware: UPS 08.8 / ID=18
> ups.mfr: American Power Conversion
> ups.mfr.date: 2014/06/20
How old is the battery?
> ups.model: Smart-UPS 1500
It's difficult to say more without knowing exactly where you are in the
sequence
of events and the timing as listed in 
https://rogerprice.org/NUT/ConfigExamples.A5.pdf chapter 2.6 The shutdown story 
for a simple server.

Roger

On 10/11/22 15:48, Roger Price wrote:
>> ups.firmware: UPS 08.8 / ID=18
>> ups.mfr: American Power Conversion
>> ups.mfr.date: 2014/06/20
> 
> How old is the battery?
~2.5 years.
The above date was probably not updated when it was changed.

Could a faulty battery pack produce this???
I mean, it keeps the systems up as long as line power stays off, can it 
then fail when the power returns???

I've had several such UPSes and never saw this.
However, if someone has seen this behaviour I'll try changing the batteries.
I'd just hate to do this and discover the UPS is faulty, instead.

N.B. The UPS is NOT asking for a battery replacement.




> It's difficult to say more without knowing exactly where you are in the
> sequence of events and the timing as listed in 
1. Wall power on
2. Wall power fails
3. ...
Not 4. (batter.low was never reached); goes directly to
14. Wall power returns.
XX. Attached computers reboot instantly!!!




  bye & Thanks
	av.