Danfoss VLT Series Design Manual page 119

VLT ® HVAC Drive Design Guide 5. How to Install
5
5.18: EMC-compliant electrical installation of an adjustable frequency drive in a cabinet.
5.7.2. Use of EMC-Compliant 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 in and outgoing radiation of electric noise depends on the
transfer impedance (Z ). The shield of a cable is normally designed to reduce the transfer of
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electric noise; however, a shield with a lower transfer impedance (Z ) value is more effective than
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a shield with a higher transfer impedance (Z ).
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Transfer impedance (Z ) is rarely stated by cable manufacturers, but it is often possible to estimate
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transfer impedance (Z ) by assessing the physical design of the cable.
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MG.11.B4.22 - VLT ® is a registered Danfoss trademark.