Danfoss VLT AutomationDrive FC 300 Design Manual page 44

FC 300 Design Guide
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 must be conveyed back
to the unit. Moreover, ensure good electrical contact from the mounting plate through the
mounting screws to the adjustable frequency drive chassis.
With respect to installation, it is generally less complicated to use non-shielded cables than shielded ones.
NOTE
When non-shielded cables are used, some emission requirements are not complied
with, although the immunity requirements are observed.
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.
44
Introduction to FC 300
MG.33.B3.22 - VLT is a registered Danfoss trademark