23
UPS for 480 Vac Grid, User Guide, doc. rel.4.0
4.
Overview of Operating Modes
The UPS functions to supply ac electrical power to your load.
The UPS has five primary modes of operation:
1.
Normal mode
2.
Battery mode
3.
Bypass mode
4.
ECO mode
5.
External Manual Bypass mode
The following sections provide a short summary of the function and purpose of each mode.
4.1.
Normal mode
The UPS is almost always in normal operation mode. The load receives its power from the
inverters that supply stabilized voltage, protected from spikes and irregularities from the ac input.
The rectifier feeds the inverter, and supplies dc power to the dc converter modules to charge the
battery.
4.2.
Battery mode
During battery operation, the load continues to receive power from the inverters, but the dc input
to the Inverter is taken from batteries via the dc converter modules, instead of from the rectifier.
Battery mode is used whenever the grid power is faulty.
The duration of the battery operation is determined by the load demand and the battery capacity.
4.3.
Bypass mode
During bypass operation, the load receives power directly from the bypass ac input via the Static
Switch.
Whenever the inverters cannot provide power to the load, either due to an overload or a short-
circuit in the load, the load is automatically moved to the bypass ac input. The load is
automatically returned to the Inverter when the problem has been corrected.
4.4.
ECO Mode
ECO Mode is an alternative mode of UPS operation.
In ECO Mode, the UPS's normal state is bypass mode. In ECO Mode the mains power directly
feeds the load via the Static Switch, while powering the rectifier and keeping the Inverter in a
