Operating The Ups; Ac Input Mode (Normal Operation) - Toshiba 4200FA Installation And Operation Manual

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
Input Isolating
Power XFMR
4200FA Installation and Operation Manual
(Not available for LT units)
MCCB
Converter
Power flow in AC Input Mode
MBS
Bypass
Inverter
Charger/
Chopper
External
Batteries
Output
Power
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