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UPS theory of operation
Unitary UPS
The unitary MGE
TM
Galaxy
TM
6000
UPSs are made up of five modular
sub-assemblies:
◗ rectifier-charger;
◗ battery;
◗ three-phase inverter;
◗ static switch;
◗ maintenance bypass.
The load and Mains 2 operate at 50
or 60 Hz.
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
and load;
◗ the battery is charged or the
charge maintained.
Mains 1
rectifier-
charger
battery
inverter
load
static by-pass switch
Mains 2
Mains 1 power down
◗ the inverter receives power from
the battery and supplies power to
the load;
◗ the battery discharges.
Mains 1
rectifier-
charger
battery
inverter
load
static by-pass switch
Mains 2
Major overload
◗ Mains 2 supplies power to the
load via the static switch;
◗ the inverter is shut down;
◗ the inverter starts-up
automatically as soon as overload
is removed;
◗ power is transferred without
affecting the load.
Mains 1
rectifier-
charger
battery
inverter
load
static by-pass switch
Mains 2
Maintenance
◗ Mains 2 supplies power to the
load via the maintenance bypass;
◗ the rectifier-charger and inverter
are shut down and disconnected
from all sources of power.
Q1
Q5N
QF1
Q3BP
Q4S
Mains 1
rectifier-
charger
battery
inverter
load
static by-pass switch
Mains 2