Connecting the power cables
￭
Connection diagram
For alternatives, see section Selecting the supply disconnecting device (page 67).
1
Use a separate grounding PE cable (2a) or a cable with a separate PE conductor (2b)
if the conductivity of the shield does not meet the requirements for the PE conductor
(see Selecting the power cables (page 68)).
2
360° grounding is recommended if shielded cable is used. Ground the other end of the
input cable shield or PE conductor at the distribution board.
3
360° grounding is required.4
External brake resistor (for frames R4...R8 only).5
Use a separate grounding cable if the shield does not meet the requirements of IEC
61439-1 (see Selecting the power cables (page 68)) and there is no symmetrically con-
structed grounding conductor in the cable (see Motor cable shield (page 71)).
6
Note: If there is a symmetrically constructed grounding conductor on the motor cable in
addition to the conductive shield, connect the grounding conductor to the grounding ter-
minal at the drive and motor ends.
Do not use an asymmetrically constructed motor cable for motors above 30 kW (see Selecting
the power cables (page 68)). Earthing at the motor increases bearing current and power
consumption, damages the motor bearing and even the motor.
90 Electrical installation
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