Three-Phase UPS (10kVA-160kVA) Series
User Manual
2 Overview
11
Mains
input
UPS2
UPS1
Load
Bypass
switch
Rectifier
Inverter
Battery
Bypass
switch
Rectifier
Inverter
Battery
Bypass
input
Figure2-2
Operating principle of series hot-standby system
2.2.3 Parallel System
The parallel equalized current of AC power works by quickly adjusting the AC output waveform,
amplitude and phase of parallel single-units and in accordance with each other strictly. Any difference
of amplitude or phase of voltage may generate large loop current, even overload or inverter damage.
The parallel system has strong anti-interference, which is to ensure reliable running of system.
Mains input
UPS2
UPS1
Load
Bypass
switch
Rectifier
Inverter
Battery
Bypass
switch
Rectifier
Inverter
Battery
Figure2-3
Operating principle of parallel system
2.3 Work Mode
The UPS has 4 working modes: mains mode, battery mode, bypass mode and maintenance bypass
mode.