ABB ACS880-04FXT, Руководство по оборудованию

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• Construct sufficient high-frequency grounding network in the cabinet to avoid voltage
differences and forming of high-impedance radiator structures. A good high-frequency
grounding is made with short flat copper braids for low inductance. One-point
high-frequency grounding cannot be used due to the long distances inside the cabinet.
• 360° high-frequency grounding of the cable shields at the cable entries improves the
EMC shielding of the cabinet.
• ABB recommends 360° high-frequency grounding of the motor cable shields at their
entries. The grounding can be implemented by a knitted wire mesh screening as shown
below.
3
1
6
4
5
2
Cable 1
Cable tie 2
Strain relief 3
Bare cable shield 4
Knitted wire mesh 5
Cabinet entry plate 6
• ABB recommends 360° high-frequency grounding of the control cable shields at their
entries. The shields can be grounded by means of conductive shielding cushions pressed
against the cable shield from both directions as shown below.
3
4
5
1
1
2
2
2
Tightening screw 1
EMI conductive cushion 2
Strain relief 3
Grommet 4
Entry plate 5
46 Generic cabinet planning instructions