> When a UPS unit performs a delayed power off (NUT sets the delay to 20 
> seconds 
> by default) it deconnects its power outlets which in some UPS units produces 
> an 
> audible "clunk".  The display of lights on the front panel changes, and the 
> beeping stops.  The delayed power off can be demonstrated with a light bulb 
> or a 
> mains circuit tester connected to one of the UPS power outlets.

Out of curiosity: if the PC has already been switched off from software by the 
shutdown script, how would it know that the power has been cut while it was 
off? Are you telling me that the power supply of the PC keeps checking its 
incoming AC supply even while off, and that with the BIOS setting I selected it 
will wake up the PC even after a power cut DURING WHICH the PC was already off? 
I never imagined that... I guess it's something I could try independently, once 
I find a quiet time with no disk activity when it's OK to shut down that 

> I looked at the product documentation at 
> https://www.cyberpower.com/uk/en/product/sku/Value800EILCD and could find 
> nothing about shutting down the UPS power outlets. Although the 800EILCD is 
> able 
> to turn off the beeper, this in itself is not sufficient. The proposed 
> typical 
> applications include NAS & Servers so it should be possible. Perhaps you 
> could 
> ask the Cyber Power support people if the 800EILCD has this function.

What exactly should I be asking? "Is it possible to switch off the power to the 
outgoing outlet by sending a command to the UPS via USB, and what is that 
command?" They provide their own Linux software, which I ignored in favour of 
NUT, so I suspect their answer, if any, might be limited to what can be done 
through that.

> I see at http://networkupstools.org/ddl/Cyber_Power_Systems/Value_800E.html 
> that 
> the Value 800E does not have variables such as
>  load.off.delay - Turn off the load with a delay (seconds)
>  load.on.delay - Turn on the load with a delay (seconds)
> What does command ? upscmd -l <UPS> ? report?

I'll try this tonight when I'm back home.

Many thanks for your help.

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