LBS DRAGON POWER 3, User Manual, Page: 20 / 62

User Manual 2Overview
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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
DC
DC
Bypass input
Mains input
Battery input
Bypass static switch
Charger
Rectification
/PFC
Inverter
Output
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 be 99%.
Maintenance bypass power supply mode (suitable for the system with distribution module)
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, then switch on the maintenance
bypass breaker and switch off the mains input breaker and bypass input breaker, output breaker. During
the transforming of manual maintenance bypass, AC power is supplied for load by maintenance bypass
breaker. At this time, the inner UPS has no electricity, maintainer can perform the maintenance safely.