Routing the cables
￭ General guidelines, IEC
• Route the motor cable away from other cables. Motor cables of several drives can be
run in parallel installed next to each other.
• Install the motor cable, input power cable and control cables on separate trays.
• Avoid long parallel runs of motor cables with other cables in order to decrease
electromagnetic interference caused by the rapid changes in the drive output voltage.
• Where control cables must cross power cables, make sure they are arranged at an
angle as near to 90 degrees as possible.
• Do not run extra cables through the drive.
• Make sure that the cable trays have good electrical bonding to each other and to the
grounding electrodes. Aluminum tray systems can be used to improve local equalizing
of potential.
This figure illustrates the cable routing guidelines with an example drive.
min. 200 mm (8 in)
90°
*min. 500 mm (20 in)
1
2
3
3
2
1
4
min. 300 mm (12 in)
2
4
3
min. 300 mm (12 in)
*
Motor cable1
Input power cable2
Control cable3
Brake resistor or chopper cable (if any)4
￭ Continuous motor cable shield or enclosure for equipment on the
motor cable
To minimize the emission level when safety switches, contactors, connection boxes or
similar equipment are installed on the motor cable between the drive and the motor:
• Install the equipment in a metal enclosure.
• Use either a symmetrical shielded cable (preferred alternative), or install the cabling in
a metal conduit.
• Make sure that there is a good and continuous galvanic connection in the shield/conduit
between drive and motor.
• Connect the shield/conduit to the protective ground terminal of the drive and the motor.
28 Electrical planning guidelines
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