Operating Status; Normal Operation; Green Conversion - LEGRAND KEOR HPE Manuel De Fonctionnement

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
16 OMP06263 REV. B
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