OM226142 rev C
17
3 OPERATING MODES
3.1 NORMAL OPERATION
During normal operation all the circuit breakers/switches are closed except MBCB
(maintenance bypass).
The three-phase input AC voltage feeds the rectifier via the filter inductor; the rectifier
supplies the inverter and compensate mains voltage fluctuations as well as load variation,
maintaining the DC voltage constant. At the same time it provides to keep the battery in
stand-by (floating charge or boost charge depending on the type of battery).
The inverter converts the DC voltage into an AC sine-wave, stabilized in voltage and
frequency, and provides to supply the load through its static switch SSI.
Picture 13 – Normal Operation
Section Status Further explanation
Rectifier Mains available and within the tolerance range
RCB CLOSED
Rectifier ON
Battery available and within the tolerance range
BCB CLOSED
Inverter ON
Bypass Mains available and within the tolerance range
BYPASS SWITCH “NORMAL”
SBCB CLOSED
Static Switch SSI ON
Static Switch SB OFF
OCB CLOSED
MBCB OPEN
Output Voltage available and within the tolerance range
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