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 5 – Battery operation
3.3.5 Manual bypass
The manual bypass operation is necessary whenever the UPS functionality is tested, or during
maintenance or repair work.
Picture 6 – Manual bypass for functional checks
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