2 Overview
Three-Phase UPS (10kVA-160kVA) Series
User Manual
10
Redundancy design for key circuit
The working power of the UPS adopts standby redundancy design, which effectively enhances the
reliability of the system.
Smart fan control
The fan adjusts rotating speed automatically in accordance with the load status to prolong fan life and
reduce noise. It can also alarm when fans fault.
2.2 Operating Principle
2.2.1 Single-unit
This series UPS are made up of input switch, filter, rectifier, inverter, static switch, bypass switch,
output transformer and batteries, etc. when the AC input is normal, the AC power will be converted
into DC power by rectifier to supply power for inverter, and charge the batteries with enough power
to supply pour power for load without transfer time when mains disconnects.
The basic structure is as shown in Figure2-1.
Bypass switch
Mains switch
Rectifier
AC/DC
Inverter
DC/AC
Transfo
rmer
Maintenance switch
Batteries
AC
SOURCE
TO LOAD
Output switch
AC
SOURCE
Filter
Battery
switch
Figure2-1
Operating principle of single-unit
2.2.2 Series Hot-standby
Connect the bypass input of UPS2 to the output of UPS1 instead of mains, it constitutes series
hot-standby working mode.
When UPS2 fault, it will turn to bypass mode automatically. At this time, the UPS1 supply power for
load, the load stay on UPS1 inverting protection status to ensure safety work. If the UPS2 stay on
bypass mode, and the UPS1 fault at the same time, the mains will supply for load directly.
