2 Overview
MY Series (10kVA-40kVA) UPS
User Manual
18
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 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
Bypass input
Mains input
Battery input
Bypass static switch
Charger
Rectification
Inverter
Maintenance bypass
Output
DC
DC
Discharger
Figure2-14
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 normal, the power for load is prior supplied by bypass, when
bypass voltage 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%.
Maintenance bypass power supply mode
When the UPS needs to be maintained and the power supply for load cannot be interrupted, user can
shut down the inverter and make the UPS works in bypass status, the gate controlled switch release