Section I: Pw Series Product System Overview; Introduction - Upsen ES33 Series User Manual

3Phase HF UPS 10-120kva USER Manual

Section I: PW series Product System Overview

1.1 Introduction

PW is a high-performance and fully digital UPS utilizing the double DSP control
technology with the power factor correction function. Its performance indexes reach the
leading level of the industry and the power grade contains 15-80 KVA. PW UPS is
connected between the commercial power and the important load to supply the
high-quality power to the load. It adopts the high-frequency double conversion pulse
width modulation（PWM） and fully digital control technology, the output voltage is not
influenced by the change and interference of the input voltage and frequency of the
utility.
As shown in diagram 1, the utility is inputted from CB1, the rectifier converts the
utility to DC .The PFC converts the low DC to high DC ( DC busbar ) and supplies
power to the DC/DC battery charger (charge the battery at any time) and the inverter. The
inverter converts the DC power to AC power to supply the load. When the utility is
interrupted, the battery supplies the back-up power to the load through the battery switch,
PFC and inverter. When inverter is fault or overload time is finished, the external bypass
supplies power to the load through the input switch CB2 and static bypass. In addition,
for the maintenance and repair of the UPS, UPS will supply the power to the load through
the internal maintenance bypass. When the UPS is in normal mode, all switches are
closed except the maintenance bypass switch.
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