ABB ACS880-37 Hardware Manual page 96

96 Electrical installation
At the other end of the cable, leave the shields unconnected or ground them indirectly via
a high-frequency capacitor with a few nanofarads, eg. 3.3 nF / 630 V. The shield can also
be grounded directly at both ends if they are in the same ground line with no significant
voltage drop between the end points.