MY-A Series (10kVA-20kVA) UPS
User Manual
2 Overview
21
mains power supply mode. If the mains always abnormal and the battery is running up, the UPS will
send sound and light alarm and stop working till battery low-voltage point. At that time, the buzzer
long beeps to alarm, the power for load powers down. Under the circumstance of mains power outage
completely, the UPS will shut down about 1min later automatically and close the power of the UPS to
avoid the battery discharge slimly, thus to protect the service life of battery. Once the mains recover,
the UPS will start automatically and turn to normal mains power supply mode.
Bypass power supply mode
Under the circumstance of bypass voltage is normal, when UPS off or fault (such as inverter output
overload, over-current surge or IGBT over-temperature etc.) while UPS on, the UPS will output by
bypass. When UPS on and the fault removed, it will turn to inverter output again. If the same fault
occurs more than 5 times in a short time, the UPS protects and output by bypass until power off
manually or power down and remove the fault, restart the UPS and then it will recover normal work.
AC
DC
DC
AC
Mains input
Battery input
Bypass static switch
Charge
Rectifier
Inverter
Maintenance bypass
Output
DC
DC
Discharge
Bypass input
Figure2-11
Bypass power supply mode (the thick solid line stands for the energy flow direction)
ECO power supply mode (just suitable for single UPS)
At the ECO mode, when bypass voltage is normal, the power for load is prior supplied by bypass,
when bypass voltage is abnormal, the power for load turns to inverter. ECO mode is an economic
operation mode. For the load which does not require high quality, user can select ECO mode to
reduce the energy consumption. At the ECO mode, the UPS efficiency can up to 99%.
