EMC Manual ServodynT, D
Switch cabinet structure
39
1070 066 074-101
Equivalent circuit diagram for highfrequency interference currents ( )
Highfrequency interference currents are created by coupling capaci
tances in the inverter, in the motor lines and in the motor.
L
F
L
L
L
L
Artificial
mains network
L
M
L
M
C
YF
C
KU
C
KU
C
KL
C
KL
C
KM
C
KM
Mains filter
Inverter
Motor
Motor line
50
W
,
50
m
H + 5
W
PE
PE
PE
Coupling
capacitance:
not screened C
KL
screened C
KLS
Coupling
capacitance
C
KM
Coupling
capacitance
C
KU
C
YF
IGBT
Range
C
YF
C
KU
per inverter
C
KL
per motor
and 10 m
length
C
KLS
per motor
and 10 m
length
C
KM
per motor
16 25 A
125 240 nF
0,5 nF
0,7 nF
2,2 nF
1 nF
50 A
800 nF
1 nF
0,6 nF
1,8 nF
4 nF
80 A
1350 nF
2 nF
0,6 nF
.
Note
The PE conductors must be continuously wired from the motors via
the PE buses of the inverter housings to the PE terminal of the mains
filter. This prevents stray interference currents.
The majority of interference in the system (machine) depends essen
tially on the version of this PE connection.
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