Chapter 6 EMC
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The following gure shows the grounding method of the shielded cable.
Figure 6-3 Grounding of the shielded cable
The installation precautions are as follows:
•
Symmetrical shielded cable is recommended. The four-conductor shielded cable can also be used as an input
cable
•
The motor cable and PE shielded conducting wire (twisted shielded) should be as short as possible to reduce
electromagnetic radiation and external stray current and capacitive current of the cable. If the motor cable is
over 100 meters long, an output lter or reactor is required.
•
It is recommended that all control cables be shielded.
•
It is recommended that shielded cables or shielded steel tube armored cables be used for the drive power
output, and the shield must be well grounded. For devices suffering from interference, shielded twisted pair
(STP) cable is recommended and the cable shield must be well grounded.
6.4.2 Cabling Requirements
•
The motor cables must be laid far away from other cables. The motor cables of several AC drives can be laid
side by side.
•
It is recommended that the motor cables, power input cables and control cables be laid in different ducts. To
avoid eletromagnetic interference caused by rapid change of the output voltage of the AC drive, the motor
cables and other cables must not be laid side by side for a long distance.
•
If the control cable must run across the power cable, make sure they are arranged at an angle of close to 90°.
Other cables must not run across the AC drive.
•
The power input and output cables of the AC drive and weak-current signal cables (such as control cable)
should be laid vertically (if possible) rather than in parallel.
•
The cable ducts must be in good connection and well grounded. Aluminium ducts can be used to improve
electric potential.
•
The lter, AC drive and motor should be connected to the system (machinery or appliance) properly, with
sparying protection at the installation part and conductive metal in full contact.
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