General Ups Description; Typology; System Description; Rectifier - LEGRAND KEOR HP Série Manuel De L'utilisateur

3

GENERAL UPS DESCRIPTION

The UPS use IGBT technology with a high changeover 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.
3.1

TYPOLOGY

The UPS are 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
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 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 5%. 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.
10 OMD10074 REV. C
UPS user manual
Manuel de l'utilisateur de l'UPS
Utilizzo dell'UPS