PowerWalker VFI 3000R - Manual (Page 9)

16
No. UPS STATUS ACTION
6
AC utility power fails .The load is
supplied by battery power. Buzzer alarm
sounds every 4 seconds.
If AC utility power fails,
reduce the less critical
load in order to extend
backup time. If it is not
abnormal power failure,
please check the rated
input or connected line.
7
AC utility fails. UPS is in battery backup
mode and battery power is approaching
low level. Buzzer alarm beeps every
second.
UPS will shut down
automatically. Please
save data soon.
8
AC utility power fails and battery runs
out. UPS has shut down automatically.
UPS will restart up when
AC utility power is
restored. If AC utility
power failure is more
than 6 hours, please
follow storage
instruction.
17
7. OPERATION MODES OF THE UPS
7.1 UPS System Block Diagram
7.2 Normal Operation
There are two main loops when AC utility is normal: the AC loop and the
battery charging loop. The AC output power comes from AC utility input and
passes through AC/DC rectifier, DC/AC inverter and static switch to support
power to load. The battery charging voltage comes from AC utility input and
converted by AC/DC charger to support battery-charging power.