2 Overview
MY-A Series (10kVA-20kVA) UPS
User Manual
20
AC
DC
DC
AC
Mains input
Battery input
Bypass static switch
Charge
Rectifier
Inverter
Maintenance bypass
Output
DC
DC
Discharge
Bypass input
Figure2-9
Normal mains power supply mode (the thick solid line stands for the energy flow direction)
Battery inverter mode
When mains is abnormal, the rectifier will transfer to battery input immediately, boost the battery
voltage and then maintain the voltage of DC bus voltage to guarantee the inverter output continuous.
As shown in Figure2-10.
DC
AC
Mains input
Battery input
Bypass static switch
Charge
Rectifier
Inverter
Maintenance bypass
Output
DC
DC
Discharge
Bypass input
AC
DC
Figure2-10
Battery inverter mode (the thick solid line stands for the energy flow direction)
Before the battery stop discharging, if the mains recover normal, the rectifier will transfer to mains
input automatically and charge the battery at the same time. That is to say, the UPS recover normal
