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OMD91046 rev D
17
2.2 BATTERY
OPERATION
In the event of mains failure, or rectifier failure, the battery feeds the inverter without
interruption. The battery voltage drops as a function of the magnitude of the discharge
current. The voltage drop has no effect on the inverter output voltage since it is kept
constant by varying the PWM modulation. As the battery approaches the discharge limit
an alarm is activated.
In case the power is restored before the limit is reached the system switches
automatically back to normal operation. If not, the inverter shuts down and the load is
transferred to the bypass (bypass operation). If the bypass mains is not available or
outside the tolerance range the complete system shuts down as soon as the lowest
battery level is reached (black-out).
As soon as the power is restored the rectifier charges 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 13 – Battery operation