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6.0 Operating the UPS
6.1 AC Input Mode (Normal Operation)
The following illustration shows circuit power flow when the UPS is operating normally in the AC Input
Mode. The converter of the UPS, including a boost chopper circuit, converts the AC input power into
DC power. The boost chopper circuit maintains a constant voltage and provides current limiting for
charging the batteries. It also supplies a DC voltage of the proper level to the inverter section. The
inverter section generates a high quality sine wave output voltage. The batteries are maintained in a
constantly charged state when the UPS is in the “Normal Operation Mode.”
Power flow in AC Input Mode
Converter Inverter
Bypass
Charger/
Chopper
Isolating
XFMR
External
Batteries
Output
Power
MCCB
MBS
Input
Power
Power Flow
4200FA CT/XT User’s Manual 37