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6.4 Battery Backup Mode
The following illustration shows power flow during the battery backup mode. When
commercial AC power failures occur, the batteries instantly begin supplying DC voltage to
the main inverter circuit. This circuit inverts (hence; Inverter) the DC power into AC power.
The AC power is available at the output. This back-up process will continue until the
battery voltage drops below a specific minimum level. When this occurs, the batteries will
stop supplying power to the load. This minimum level is the rated minimum voltage (V min).
Power flow in battery backup mode
Converter Inverter
Bypass
Charger/
Chopper
Isolating
XFMR
External
Batteries
Output
Power
MCCB
MBS
4200FA CT/XT User’s Manual 39