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UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
16
OMP06263 REV. B
3.3 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
Содержание BSK93
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