EMC-correct electrical installation
General points to be observed to ensure EMC-correct
electrical installation.
-
Use only screened/armoured motor cables
and screened/armoured control cables.
-
Connect the screen to earth at both ends.
-
Avoid installation with twisted screen ends
(pigtails), since this ruins the screening effect
at high frequencies. Use cable clamps in-
stead.
-
It is important to ensure good electrical con-
tact from the installation plate through the
installation screws to the metal cabinet of the
frequency converter.
-
Use starwashers and galvanically conductive
installation plates.
-
Do not use unscreened/unarmoured motor
cables in the installation cabinets.
The illustration below shows EMC-correct electrical in-
stallation, in which the frequency converter has been
fitted in an installation cabinet and connected to a PLC.
MG.27.E2.02 - VLT is a registered Danfoss trademark 43
Installation
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