3 Electrical Installation
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and strong-current circuit cables (power input, AC drive output, and braking resistor
connecting cable) of the controlled AC drive must be routed separately with a distance
longer than 30 cm to reduce interference on the analog generated by the AC drive and
other devices. This requirement must be met even inside the control cabinet.
2) Requirements on the analog control signal cable:
Use the twisted pair shielded cables as the analog control signal cables.
When stripping the sheathing back of the cable, the stripped part must be as short as
possible (5–7 mm), and wrap the stripped shield with the insulating tape to prevent the
shielded cable from contacting other cables, eliminating interference.
3) Requirements on the motor cable:
Use the shielded cables as the motor cables.
The distance between the power unit and the motor must be as short as possible.
The motor cables must be separated from other cables.
To avoid electromagnetic interference caused by rapid change of the power unit output
voltage, the motor cables and other cables must not be laid side by side for a long
distance.
4) Requirements on the power cables:
Use the shielded cables as the motor cables, or protect all cables between the power
unit and the motor with ducts.
5) Requirements on the control cables and power supply cables:
If the control cable must run across the power cable, make sure they are arranged at an
angle of close to 90° .
3.4.3 Routing Suggestions
1) Separate cables for transmitting dierent signals.
Reserve a distance between interfering cables and sensitive cables. If the routing
space is large, the recommended distance is 30 cm.
If these two types of cables must cross, arrange them at an angle of 90° to prevent
interference.
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