Electrical installation
32
Connecting the power cables
Connection diagram
INPUT OUTPUT
U1
V1
W1
3 ~
Motor
U1 V1 W1
1)
U2 V2 W2
BRK-
L1 L2 L3
PE
Drive
PE
For alternatives, see
section Supply
disconnecting device
on page 23.
Optional brake
resistor
1)
Ground the other end of the PE conductor at the distribution board.
2)
Use a separate grounding cable if the conductivity of the cable shield is insufficient (smaller than the conductivity of the
phase conductor) and there is no symmetrically constructed grounding conductor in the cable (see section Selecting the
power cables on page 26).
Note:
Do not use an asymmetrically constructed motor cable.
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.
Grounding of the motor cable shield at the motor end
For minimum radio frequency interference:
• ground the cable by twisting the shield as follows: flattened width >
1/5 · length
• or ground the cable shield 360 degrees at the lead-through of the motor terminal
box.
a
b
b > 1/5 · a
BRK+
2)
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