UPS user manual
Manuel de l’utilisateur de l’ASI
Utilizzo dell’UPS
16 OMG38225 REV. B
When the Green Conversion algorithm is active the rectifier operates at reduced DC voltage and
supplies the inverter alone, since the battery is disconnected from the DC bus. The battery charge is
controlled by a specific algorithm. In case no mains outage events have occurred, and so no battery
discharges have occurred too, the control logic provides to start a charging cycle once every 25
days. The battery-charger restores the capacity lost due to the self-discharge and remains in floating
charge for additional 12 hours. As this time has elapsed the battery static switch is opened and the
battery is disconnected from the DC bus.
In case a discharge event occurs, the control logic provides to calculate the capacity which has
been lost during the discharge; as the mains is restored a charging cycle is started, which is
extended for an additional time that depends on the percentage of lost capacity, referred to the rated
value.
Lost capacity < 10% Additional charge for 12 hours
Lost capacity between 10% and 20% Additional charge for 48 hours
Lost capacity > 20% Additional charge for 96 hours
Such values complies with the recommendations of the main battery manufacturers.
Set the right battery capacity
The UPS front panel allows the setting of the battery parameters, including the rated
capacity. Considering the importance that such value assumes for the correct
execution of the charge control algorithm, it is highly recommended to verify the
correctness of the programmed value.
3.3.3 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.
Picture 4 – Load supplied by bypass
3.3.4 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.
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