10 Shield T3 60 – 500KVA User Manual
Auto-restart mode
Frequency Converter mode
1.4.1
Normal mode
The inverter of power modules continuously supply the critical AC load. The
rectifier/charger derives power from the AC mains input source and supplies DC power
to the inverter while simultaneously FLOAT or BOOST charging its associated backup
battery.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Charge/
Discharge
Output
Battery
Bypass
Figure1-3 UPS conceptual diagram in normal mode
o
Note
Indicates the energy flow direction.
1.4.2
Battery Mode
Upon failure of the AC mains input power, the inverter of power unit, which obtain
power from the battery, supply the critical AC load. There is no interruption in power to
the critical load upon failure. After restoration of the AC mains input power, the”
Normal mode” op
eration will continue automatically without the necessity of user
intervention.
Rectifier
AC/DC
Main
Static Bypass
Manual Bypass
Inverter
DC/AC
Charge/
Discharge
Output
Battery
Bypass
Figure1-4 UPS conceptual diagram in Battery mode
o
Note
With the function of Battery cold start, the UPS may start without utility. See more
detail in section4.1.2.
