Goodrive600 series high-performance multifunction VFD
Optional peripheral accessories
-401-
The conductivity of the PE grounding conductor is the same as that of the phase conductor, that is, the
cross-sectional areas are the same.
For details about the EMC requirements, see Appendix C Technical data.
To meet the EMC requirements stipulated in the CE standards, you must use symmetrical shielded cables as motor
cables (as shown in the following figure).
Four-core cables can be used as input cables, but symmetrical shielded cables are recommended. Compared with
four-core cables, symmetrical shielded cables can reduce electromagnetic radiation as well as the current and loss of the
motor cables.
Shield layer
Jacket
Insulator
Conductor
PE
PE conductor and
shield layer
Jacket
Insulator
Conductor
Jacket
Insulator
Conductor
PE
Symmetrical shielded cable
Four-core cable
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Note: If the conductivity of the shield layer of the motor cables cannot meet the requirements, separate PE
conductors must be used.
To protect the conductors, the cross-sectional area of the shielded cables must be the same as that of the phase
conductors if the cable and conductor are made of materials of the same type. This reduces grounding resistance, and
thus improves impedance continuity.
To effectively restrict the emission and conduction of radio frequency (RF) interference, the conductivity of the shielded
cable must at least be 1/10 of the conductivity of the phase conductor. This requirement can be well met by a copper or
aluminum shield layer. The following figure shows the minimum requirement on motor cables of a VFD. The cable must
consist of a layer of spiral-shaped copper strips. The denser the shield layer is, the more effectively the electromagnetic
interference is restricted.
Cross-section of the cable
Insulating layer
Shield layer
E.4.2 Control cable
All analog control cables and cables used for frequency input must be shielded cables. Analog signal cables need to be
double-shielded twisted-pair cables (as shown in figure a). Use one separate shielded twisted pair for each signal. Do
not use the same ground wire for different analog signals.