Schaffner Group
User and Installation Manual
Output filter FN5420 and RWK5420
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3.5 Screw size, torque and cable cross-section requirement
3.5.1 Power terminals
The cable cross-section must be selected according to the rated filter current, the maximum current,
the environment and other special requirement of the application. It should be stranded copper wire
cable with a temperature rating of ≥75°C. Recommended cable cross
-section is given in Table 8 and
In many applications a shielded motor cable may not be required when a sine wave filter is applied
with a motor drive. Anyhow, due to other possible influences of common mode disturbances Schaffner
does recommend using shielded motor cables. This is to avoid back-coupling of radiated interferences
to the mains cable at the frequency range from 1–30 MHz. This EMC measure however can only be
considered efficient, if both ends of the cable shield of the motor cable are put in proper HF low-imped-
ance contact with the ground of the motor and the frequency converter.
Figure 8 Example of proper gounding of the shielding (many other solutions are possible)
The customer is fully responsible to define the most appropriate conductor type according to the appli-
cation and ensure a proper connection of the filter.
