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UPS user manual
Utilizzo dell’UPS
OMD91052 REV. C 11
3.2.2 Inverter
It converts the direct voltage coming from the rectifier or from the DC battery into alternating
AC voltage stabilized in amplitude and frequency.
The inverter uses IGBT technology with a high changeover frequency of approximately 15
kHz.
The control electronics uses a 32 Bit

P of latest generation that, thanks to its processing
capability, generates an excellent output sine-wave.
Moreover, the fully digital control of the output sine-wave allows to achieve high
performances, among which a very low voltage distortion even in presence of high-distorting
loads.
3.2.3 Battery and battery charger
The battery can be installed inside (only 10-20kVA) or outside (10-60kVA) the UPS.
The battery charger logic is completely integrated in the rectifier’s control electronics.
The battery is charged, according to the DIN 41773 Standard, every time it has been
partially or completely discharged. When its full capacity is restored, it is kept floating so as to
compensate for any autodischarge.
3.2.4 Static bypass
The Static Bypass allows to transfer the load between Inverter and Emergency Mains, and
vice-versa, in a very short time, and uses SCR’s as power commutation elements.
3.2.5 Manual bypass
The Manual Bypass is used to cut off the UPS completely, supplying the load directly from
the input mains in case of maintenance or serious failure.
Follow the procedures contained in the manual
The sequence of manual bypass switching and return must be carried out with
respect to the procedure indicated in the installation and start-up section. The
manufacturer cannot accept responsibility for damages arising from incorrect
operation.