OMD94016 REV.
C
13
3.3.2
BYPASS OPERATION
The load can be switched to bypass either automatically or manually.
The manual changeover is due to the BYPASS SWITCH which forces
the load to bypass. In case of failure of the bypass line, the load is
switched back to inverter without interruption.
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 load 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 are available again. The inverter is restarted
when the battery has partially restored its capacity.
Figure 3: Load supplied by bypass
Summary of Contents for UPS 10 kVA
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