ABB ACS580-04 Hardware Manual page 48

48 Generic cabinet planning instructions
conductive gasket between the surfaces is required. The maximum recommended
distance between assembly screws is 100 mm (3.94 in).
• 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.
1
3
4
• 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.
1
4
2
5
6
2
2
3
2
5
1 Cable
2 Cable tie
3 Strain relief
4 Bare cable shield
5 Knitted wire mesh
6 Cabinet entry plate
1
1 Tightening screw
2 EMI conductive cushion
3 Strain relief
4 Grommet
5 Entry plate