General Ups Description; Typology; System Description; Rectifier - LEGRAND KEOR HPE Manuel De Fonctionnement

3

GENERAL UPS DESCRIPTION

3.1

TYPOLOGY

The UPS described in this manual is on-line, double conversion; the inverter included in the
UPS always supplies energy to the load, whether mains is available or not (according to the
battery autonomy time).
This configuration guarantees the best service to the User, as it supplies clean power
uninterruptedly, ensuring voltage and frequency stabilization at nominal value. Thanks to the
double conversion, it makes the load completely immune from micro-interruptions and from
excessive mains variations, and prevents damage to critical loads (Computer - Instrumentation -
Scientific equipment etc.).
Output voltage present
The line connected to the UPS output is energized even during mains failure,
therefore in compliance with the prescriptions of IEC EN62040-1-2, the installer will
have to identify the line or the plugs supplied by the UPS making the User aware of
this fact.
Picture 1 – Block diagram
The UPS uses IGBT technology with a high switching frequency in order to allow a low
distortion of the current re-injected into the supply line, as well as high quality and stability of
output voltage. The components used assure high reliability, very high efficiency and
maintenance easiness.
3.2

SYSTEM DESCRIPTION

3.2.1 Rectifier

It converts the three-phase voltage of the AC mains into continuous DC voltage.
It uses a three-phase fully-controlled IGBT bridge with a low harmonic absorption.
The rectifier in normal operation can operate
counterclockwise.
The control electronics uses a 32 bit P of latest generation that allows to reduce the distortion
of the current absorbed by mains (THDi) to less than 3%. This ensures that the rectifier does
not distort the supply mains, with regard to the other loads. It also avoids cable overheating due
to the harmonics circulation.
The rectifier is so sized as to supply the inverter at full load and the battery at the maximum
charging current.
14 OMP06263 REV. B
UPS user manual
Manuel de l'utilisateur de l'ASI
Utilizzo dell'UPS
with phase rotation clockwise and