Battery Operation; Picture 4 - Battery Operation - LEGRAND KEOR HP Série Manuel De L'utilisateur

3.3.3 Battery operation

In case of power failure or rectifier fault, the battery feeds the inverter without interruption.
The battery voltage drops based on the amplitude of the discharging current. The voltage drop
has no effect on the output voltage, which is kept constant by changing the PWM modulation.
An alarm is activated when the battery is near the minimum discharge value.
In case the supply is restored before the battery is completely discharged, the system will be
switched back to normal operation automatically. In the opposite case, the inverter shuts down
and the load is switched to the bypass line (bypass operation). If the bypass line is not available
or is out of tolerance, the loads supply is interrupted as soon as the battery reaches the
discharge limit threshold (black-out).
As soon as the supply is restored, the rectifier will recharge the battery. In the standard
configuration, the loads are supplied again via static switch SSB when mains is available again.
The inverter is restarted when the battery has partially restored its capacity.
The system restart from the black-out condition can be customized based on the
requirements of the plant, in three different modes:
 Bypass
 Inverter
 Man. Inverter  the output supply is NOT restored automatically. The system
Picture 4 – Battery operation
Manuel de l'utilisateur de l'UPS
 loads are supplied as soon as the bypass line is available (factory
configuration).
 loads are supplied by the inverter (even if the bypass line is
available) when the battery voltage has reached a programmed
threshold, after the rectifier restart.
requires a confirmation to restart which can only be done manually
by the user via the front panel.
UPS user manual
Utilizzo dell'UPS
OMD10074 REV. C 13