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Reinforced protective ground
Mains supply
L1
L2
L3
PE
PLC
Control cables
Minimum 16 mm
2
equalizing cable
Minimum 200 mm
between control
cables, motor cable,
and mains cable
Motor, 3-phases and protective ground
PLC, etc.
Panel
Output contactor, etc.
Ground rail
Cable insulation stripped
All cable entries in 1 side of panel
130BA048.14
Illustration 9.7 EMC-correct Electrical Installation of a Frequency Converter in Cabinet
9.5.1 Using Shielded Control Cables
Danfoss recommends braided shielded/armored cables to optimize EMC immunity of the control cables and the EMC
emission from the motor cables.
The ability of a cable to reduce the incoming and outgoing radiation of electric noise depends on the transfer impedance
(Z
T
). The shield of a cable is normally designed to reduce the transfer of electric noise. However, a shield with a lower
transfer impedance (Z
T
) value is more effective than a shield with a higher transfer impedance (Z
T
).
EMC and Harmonics
VLT
®
Parallel Drive Modules
98
Danfoss A/S © 6/2016 All rights reserved.
MG37N102
9
9