PowerWalker VFI 1000E User Manual

Page 12

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.

7.3 AC Utility Failure

The AC output comes from battery, passing through DC/AC inverter and

static switch within the battery backup time.

7.4 Bypass Enable

Under the following conditions, the bypass will be enabled:

1.Overload.

2.Inverter failure.

3.Over-temperature