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In this double conversion mode, the rectifier works powered by the
AC network and supplying direct voltage to the inverter (DC bus).
The inverter converts the DC voltage into a stabilised sine wave,
connecting to the loads via its static switch. The rectifier also sup-
plies voltage to the battery charger, which keeps the batteries in an
optimal state of charge.
It is the operating status with the highest protection for the loads,
as it applies "clean" voltage to them independently of the input
voltage, and with the battery power available in case an AC net-
work fault occurs.
Fig. 12. UPS power flow in normal mode.
4.5.2. Battery mode
In the event of an AC power supply fault, the rectifier-booster
switches its input power source from the AC network to the bat-
tery without interruption. Although the battery voltage decreases
according to the discharge current value, the rectifier-booster is
responsible for keeping the direct voltage to the inverter input
within the nominal working values.
If the supply is restored before the batteries are completely dis-
charged, the system will return to normal operation automati-
cally: rectifier operating in AC/DC conversion, charger charging
batteries and inverter operating normally.
Otherwise, as soon as the batteries reach the discharge limit (end of
autonomy), the inverter switches off, and if the unit has a common
Fig. 13. UPS power flow in battery mode.
USER MANUAL
input for the rectifier and the bypass, the power supply of the load
is interrupted ("black-out"). For units with a bypass line that is in-
dependent of the rectifier AC input, if, upon reaching the battery
discharge limit, the voltage in the bypass line is within the toler-
ance limits, the power supply of the load will be transferred to this
emergency line.
After a stop due to the end of autonomy, when the power supply
is restored, the rectifier will restart the charging of the bat-
teries. If the power supply of the loads was interrupted (common
bypass at rectifier input), they will be powered initially via the
static bypass switch, and once the inverter restarts and is re-
connected to the output, they will be powered by it.
SLC CUBE4 7,5 kVA a 20 kVA - UNINTERRUPTIBLE POWER SOIRCE (UPS)-
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