[Nut-upsuser] CyberPower BR850ELCD ignores offdelay and turns itself back on while still on battery

[Sebastian Hosche]

Hi there,

I just purchased a CyberPower BR850ELCD and while setting NUT up with 
the install instructions from the homepage was pretty straightforward, 
and the UPS was detected by the usbhid-ups driver, I'm having problems 
getting the UPS to work properly.

First issue: whatever I set as the offdelay, seems to be ignored and the 
UPS just cuts the power about 2sec after receiving the shutdown command.

Second issue: When the UPS is on battery power and I issue the shutdown, 
it goes off, but after about 15sec it comes back on even while still on 
battery power. I tried setting ondelay to -1 and while that keeps the 
USV off, when the power comes back, the USV appears to turn on, but 
there is no power on its outlets. Only the additional 3 outlets that are 
not covered by the battery, do have power. The only fix is to turn off 
the USV and turn it back on.
For this issue, I attached three driver debug logs:

1. debug_default-ondelay.txt - it starts with the UPS on battery power 
getting a shutdown. Afterward the driver quits, I run it right away to 
capture the UPS coming back while still on battery.

2. debug_ondelay_-1.txt - starts again with the shutdown command while 
on battery. After about 15sec the UPS relay clicks as usual while still 
on battery, but this time it doesn't switch on the connected device. I 
restore the power to the UPS and still the connected device remains 
without power. I did verify that the non UPS outlets of the UPS do carry 
power.
I turn off the UPS and back on, which returns power to the connected 
device.

3. debug_no-prior-shutdown.txt - that's a log I recorded first without 
running any of the shutdown tests.


In addition to the debug logs, I also was curious to see if anything 
changed in the uspc output after I issued the shutdown command. I 
attached that as the upsc_output_on_shutdown.txt file. Only on the first 
command, did I include all the variables. For subsequent commands, I 
just included the ones that changed over the course of the test.

Before cutting the power, you can see the "OB DISCHARG" status in 2)))) 
as I would expect it for when the UPS is on battery power.
That changes into "OB CHRG" in 3)))) after I issued the shutdown 
command. What does that mean? on battery + charge doesn't make any sense 
to me.
4)))) is then shortly before the UPS turns power back on (while still on 
battery) - the "ups.timer.shutdown" variable is back to the default.
5)))) is after the UPS turned the power back on (still running on 
battery) - The status changed to "OB DISCHARG" and the "ups.timer.start" 
is also back to default.


I'm running Debian 7 with the latest security updates installed on an 
ODroid U3 (armhf architecture).
NUT version is 2.6.4-2.3+deb7u1 and was installed via apt-get package 
manager.
UPS is the CyberPower BR850ELCD - specs are on the homepage:
http://eu.cyberpowersystems.com/products/ups_systems/brics_lcd/br850elcd.htm

Does anyone have an idea on what I could change to get the UPS to not 
turn back on while still on battery?

As a next test, I'll try to run the battery down to see how it acts 
then. I'm hoping that it'll not turn on the power until the mains is 
plugged back in.

Thanks,
Sebastian
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