[Nut-upsuser] powermust 400

[Vitaly Oborsky]

As I have found out from the documentation, the reason of such
behaviour that at mine UPS condition OB and LB come when the battery
is already practically unloaded. I.e. all works how should work. In
that case recommend to use upssched to switch off a computer earlier.
Tried it to adjust, but for some reason does not leave. Can specify
full adjustments, listings of necessary scripts, for a simple case
when UPS has started to work from the battery, at once to switch off
system? In advance thanks.