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UPS theory of operation (continued)
Operation with battery
Mains 1 power up:
◗ the inverter receives power from
the rectifier-charger and supplies
power to the load. There is no
direct connection between Mains 1
and the load.
load
Mains 1
rectifier-
charger
battery
inverter
Mains 1 power down:
◗ the inverter runs on battery power
and supplies power to the load;
◗ the battery discharges.
Maintenance position
(disconnected):
◗ no power to the load (except in
parallel connected systems, where
other units supply power).
load
Mains 1
rectifier-
charger
battery
inverter
Q1
Q5N
QF1
load
Mains 1
rectifier-
charger
battery
inverter