Danfoss VLT AutomationDrive FC 300 Design Manual page 41

FC 300 Design Guide
If the screen is to be placed on a mounting plate for the requency converter, the mounting plate must be
made of metal, because the screen currents have to be conveyed back to the unit. Moreover, ensure good
electrical contact from the mounting plate through the mounting screws to the frequency converter chassis.
With respect to installation, it is generally less complicated to use unscreened cables than screened ones.
NB!:
When unscreened 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.
Introduction to FC 300
MG.33.B4.02 - VLT is a registered Danfoss trademark
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