2 Overview
MY-A Series (10kVA-20kVA) UPS
User Manual
22
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
automatically when open the maintenance bypass cover plate, 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.
AC
DC
DC
AC
Mains input
Battery input
Bypass static switch
Charge
Rectifier
Inverter
Maintenance bypass
Output
DC
DC
Discharge
Bypass input
Figure2-12
Maintenance bypass power supply mode (the thick solid line stands for the energy flow
direction)
