Electrical installation
61
Power cable connection
Connecting the power cables
• Connect the twisted shield of the cable to the drive grounding terminal. Note:
cable lugs are needed in frame sizes R2 and R3.
• Supply cable grounding:
If shielded cable is used, and the conductivity of the
shield is < 50% of the conductivity of the phase conductor, use a separate PE
cable (1) or a cable with a grounding conductor (2). With shielded cable 360°
grounding of the supply cables is recommended.
Motor cable grounding:
Use a separate grounding cable (3) if the conductivity of
the cable shield is < 50% of the conductivity of the phase conductor and there is
no symmetrically constructed grounding conductor in the cable (see Planning the
electrical installation: Selecting the power cables).
360 degrees grounding is required at the cabinet entry in first environment
installations. First environment EMC compliance is defined in chapter Technical
data.
Note: If there is a symmetrically constructed grounding conductor in the motor
cable in addition to the conductive shield, connect the grounding conductor to the
grounding terminal at the drive and motor ends.
Note: Do not use an asymmetrically constructed motor cable. Connecting its
fourth conductor at the motor end increases bearing currents and causes extra
wear.
INPUT
OUTPUT
U1
V1
W1
3 ~
Motor
U1
V1 W1
1)
U2
V2 W2
UDC+
R+
UDC-
R-
L1 L2 L3
(PE) (PE)PE
2)
3)
Drive with brake chopper included
PE
For alternatives, see
Planning the electrical
installation:
Disconnecting device
(means).
External brake
resistor (360
degrees grounding
required)
Power cable connection
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