
Design Guide | iC7 Series Air-cooled System Modules
3
M
2
Control
unit, AFE
Star coupler
board, AFE
AFE
power
units
(1–6 PUs)
INU
power
units
(1–6 PUs)
Pre-charging
circuit
LCL
Filter
Mains
device
AC
fuses
DC
fuses
DC connection
AC grid
3
2
2
2
Control
unit, INU
Star coupler
board, INU
e3
0b
k9
32
.1
0
Figure 28: DC Connections of Parallel Power Units
3
M
2
Control
unit, AFE
Star coupler
board, AFE
AFE
power
units
(1–6 PUs)
INU1
power
units
(1–6 PUs)
Pre-charging
circuit
LCL
Filter
Mains
device
AC
fuses
DC
fuses
DC connection
AC grid
3
2
2
2
Control
unit, INU1
Star coupler
board, INU1
M
INU2
power
units
(1–6 PUs)
2
2
Control
unit, INU2
Star coupler
board, INU2
M
INU3
power
units
(1–6 PUs)
2
2
Control
unit, INU3
Star coupler
board, INU3
e3
0b
k9
33
.1
0
Figure 29: DC Connections of a Drive Lineup
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