GB - 18
L
1
L
2
L
3
++
– –
This connection is made for KEB frequency inverters, when the d.c. terminals
are assigned with ‘++’ and ‘– –’ .
4.2.4
R4-S as Combination with Inverter
Connection DC-bus
The R4-S regenerative unit can be combined with frequency inverters with DC-
bus connection (see picture 1). In this case the frequency inverter must be con-
nected to the supply via a separate choke (4 % U
K
) (see picture 2).
K1 (or mains switch)
R4
-IN
-OUT +OUT
+IN
L1_2
PE
L1
L2
L3
L2_2
L3_2
PE
L1 L2 L3
FU
+ +
L1
L2
L3
U V W
HF-
Filter
(R4)
PE
M
3
~
3
L1
L2
L3
L1
L2
L3
L3'
L3'
L2'
L2'
L1'
L1'
U
ZK
B6-
Rectifier
IGBT’s