Danfoss FC 300 Design Manual page 42

3. Introduction to FC 300
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If the shield is to be placed on a mounting plate for the adjustable frequency drive, the mounting
plate must be made of metal, because the shield currents have to be conveyed back to the unit.
Moreover, ensure good electrical contact from the mounting plate through the mounting screws
to the adjustable frequency driver chassis.
In order to reduce the interference level from the entire system (unit + installation), make motor
and brake cables as short as possible. Avoid placing cables with a sensitive signal level alongside
motor and brake cables. Radio interference higher than 50 MHz (airborne) is especially generated
by the control electronics.
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NOTE
When non-shielded cables are used, some emission requirements are not complied
with, although the immunity requirements are observed.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
FC 300 Design Guide