Electrical installation 79
9. Crimp a cable lug onto each shield pigtail. Fasten the lugs to ground terminals.
Note: Try to work out a compromise between the length of the pigtail and the
length of unshielded phase conductors as both should ideally be as short as
possible.
10. Cover visible bare shield and pigtail with insulating tape.
11. With frame size R3 or R4
, cut suitable slots on the edges of the connector covers
to accommodate the supply and motor cables. Install the covers again. (Tighten
the screws to 3 N·m [25 lbf·in]).
12. Secure the cables outside the unit mechanically.
13. Ground the other end of the supply cable shield or PE conductor(s) at the
distribution board. In case a mains choke and/or an EMC filter (option +E200) is
installed, make sure the PE conductor is continuous from the distribution board to
the drive.
Grounding the motor cable shield at the motor end
For minimum radio frequency interference, ground the cable shield 360 degrees at
the lead-through of the motor terminal box
or ground the cable by twisting the shield so that the flattened shield is wider than 1/5
of its length.
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