PowerWalker VFI 6000LE Plus - Manual (Page 4)

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1. Product introduction
1.1 Functions description
This product is a true online double-conversion UPS
(Uninterruptible Power Supply). It provides perfect protection for
critical load such as computer system. It can eliminate almost all
mains power disturbances. The input AC current can be
corrected to a wave following the mains voltage, so it is a high
power factor system. Through the PWM control technology, the
output voltage can be a pure & stable sine wave AC voltage.
When the mains input become abnormal, the controller will stop
the AC/DC and start the DC/DC section immediately to make
sure the DC/AC (inverter) section can continue to work. After the
mains input comeback to normal range, the DC/DC will be
stopped and the AC/DC works again. So the load is always
power-supplied through inverter without any interrupt if the UPS
is turned on.
The UPS also provides an internal bypass way to make the load
can be powered by mains input directly when the UPS is off or
failed.
The UPS have an internal charger for batteries, the charger will
charge the batteries when the mains is in a reasonable range on
“bypass mode” or “line mode”.