APC 6000 User Manual
Page 18 -
6739389EN/FB
UPS theory of operation
Unitary UPS
The unitary MGE
TM
Galaxy
TM
6000
UPSs are made up of five modular
sub-assemblies:
sub-assemblies:
◗
rectifier-charger;
◗
battery;
◗
three-phase inverter;
◗
static switch;
◗
maintenance bypass.
The load and Mains 2 operate at 50
or 60 Hz.
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;
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
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 load;
◗
the battery discharges.
Mains 1
rectifier-
charger
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;
is removed;
◗
power is transferred without
affecting the load.
Mains 1
rectifier-
charger
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.
from all sources of power.
Q1
Q5N
QF1
Q3BP
Q4S
Mains 1
rectifier-
charger
charger
battery
inverter
load
static by-pass switch
Mains 2