Inverter; Battery And Battery Charger; Static Bypass - LEGRAND VR61-18 Manuel De L'utilisateur

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 a 3-level power conversion bridge with IGBT technology in order to work
with a high switching frequency of approximately 8 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 is installed outside the UPS. It is generally housed in an external battery cabinet.
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 disconnected from the DC bus
by means of a static switch, in order to save energy, reduce the stress due to the AC ripple thus
increasing the lifetime. This operating mode is called Green Conversion.
It is however periodically charged but the prevailing state is of complete rest.

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.
External manual bypass
In the UPS system the manual bypass isolator is optional and installed outside the
unit.
UPS user manual
Manuel de l'utilisateur de l'ASI
Utilizzo dell'UPS
OMP06145 REV. D 15