LEGRAND BSK93, Operating Manual

Page: 1240 / 1398

UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
OMW07104 REV.A 15
OPERATING STATUS
The UPS has five different operating modes, as described below:

Normal operation

Green Conversion

Bypass operation

Battery operation

Manual bypass
3.3.1 Normal operation
During normal operation all the circuit breakers/isolators are closed, except for MBCB (maintenance
bypass).
The rectifier is supplied by the AC three-phase input voltage which, on its turn, feeds the inverter and
compensates mains voltage as well as load variations, keeping the DC voltage constant. At the same time,
it provides to charge the battery. The inverter converts the DC voltage into an AC sine-wave with stabilized
voltage and frequency, and also supplies the load via its static switch SSI.
Picture 2 – Normal operation
3.3.2 Green Conversion
During the operation in Green Conversion mode the battery is disconnected from the DC bus by means of
a static switch (see picture) and the rectifier works at reduced DC voltage; a control algorithm provides to
periodically re-connect the battery for recharge purposes (intermittent charging).
Picture 3 – Green Conversion