Wärtsilä JOVYSTAR COMPACT L
BAX 5624
- 45 -
11.3.4 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
loads are supplied as soon as the bypass line is available (factory
configuration).
Inverter
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.
Man. Inverter
the output supply is NOT restored automatically. The system requires
a confirmation to restart which can only be done manually by the user
via the front panel.
Picture 29 – Battery operation
