LEGRAND KEOR HPE 100 kVA Manuel De Fonctionnement page 158

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 switching frequency of approximately 7.5 kHz.
The control electronics uses a 32 Bit μP 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 either internally or externally (inside a cabinet) for KEOR HPE 60/80kVA.
For KEOR HPE 100-125-160kVA 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.
14 OMG38225 REV. F
UPS user manual
Manuel de l'utilisateur de l'ASI
Utilizzo dell'UPS