[Nut-upsuser] Unexpected shutdown begins for WOW-500U

[Sergei V. Dubrov]

G'day, all!

I installed latest stable nut-2.6.1.tar.gz from source on Xenserver 5.6 SP2 
(Linux xen-home 2.6.32.12-0.7.1.xs5.6.100.323.170596xen #1 SMP Fri Apr 8 
07:25:07 EDT 2011 i686 athlon i386 GNU/Linux), my UPS is Powercom WOW--500U 
FW3.A4. All works almost fine but here are some troubles: when I pull the 
plug then upsd immediately starts (after FINALDELAY delaying) the procedure 
of shutdown as if UPS have low battery. What I see after pulling the plug:

./upsc xen-home battery.charge
72 

./upsc xen-home ups.status
OB DISCHRG

OB status is correct but why is there DISCHRG status?! This flag, as I 
think, cause immediately begin of shutdown although the battery is not 
discharged and has 72 percent of charge.

Is DISCHRG exactly from UPS or is it an inaccurate interpretation of 
obtained status from WOW-500U?

TIA,
Sergei Dubrov