34006451EN/AC - Page 16
Installation
Example of an installation comprising three modular UPSs with an external maintenance bypass Fig. 15
Important. The power cables between each UPS and the upstream protection devices must be the same length. The
same holds for the power cables between each UPS cubicle and the external maintenance bypass.
mains 1
earth
static
switch
inverter 1
rectifier
charger
Q4S
modular UPS cubicle 2
+
-
+
-
QF1
Q1 Q5N
Q4S
modular UPS cubicle 1
+
-
+
-
QF1
Q1 Q5N
Q4S
modular UPS cubicle 3
+
-
+
-
QF1
Q1 Q5N
Q3BP
Q5N
External maintenance bypass cubicle
External
maintenance
bypass line
mains 1
earth
static
switch
inverter 2
rectifier
charger
mains 1
earth
static
switch
inverter 3
rectifier
charger
load
mains 2
battery cubicle
beside rectifier-
inverter cubicle 1
other battery
cubicles (if
applicable)
earth earth
frames interconnection for earthing
frames interconnection for earthing
mains 2
battery cubicle
beside rectifier-
inverter cubicle 2
other battery
cubicles (if
applicable)
earth earth
frames interconnection for earthing
frames interconnection for earthing
mains 2
battery cubicle
beside rectifier-
inverter cubicle 3
other battery
cubicles (if
applicable)
earth earth
frames interconnection for earthing