Shanghai Sigriner STEP Electric Co., Ltd.
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A.2.3 Requirements for shielded cables
The high-frequency and low-impedance shielded armored cables, such as braided copper wire mesh
and aluminum wire mesh, should be used.
A.2.4 Requirements for shielded cable installation
Generally, the control cable should be a shielded cable, and the shielded wire mesh must be
connected to the metal cabinet by 360° loop connection through cable clamps at both ends, as shown
in Figure A-4. The shielding grounding method as shown in Figure A-5 is wrong.
Figure A-4 Correct Shield Grounding Method
Figure A-5 Incorrect Shield Grounding Method
A.3 Grounding
A.3.1 Grounding mode
See Figure A-6 for the grounding mode of grounding electrode.
Figure A-6 Schematic Diagram of Special Grounding Electrode
Among the four grounding modes in the above figure, method (a) is the best one, users are advised
to use this method for grounding as much as possible.
A.3.2 Precautions for grounding cables
(1) The grounding cable with standard section should be selected as much as possible to ensure
that the grounding impedance is as small as possible. As the high frequency impedance of flat
cable is smaller than that of circular conductor, it is better to choose flat cable with the same
cross-sectional area.
(2) The grounding cable should be as short as possible, and the grounding point should be as
close to the inverter as possible.
(3) If a four-core cable is used as the motor line, one of the four-core cable must be grounded at
the inverter side, and the other side must be connected to grounding end of the motor. If the
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