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
