ABB ACS580-04 - Page 48

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.
Cable1
Cable tie2
Strain relief3
Bare cable shield4
Knitted wire mesh5
Cabinet entry plate6
3
1
6
4
5
2
• 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.
Tightening screw1
EMI conductive cushion2
Strain relief3
Grommet4
Entry plate5
3
4
5
1
1
2
2
2
48 Generic cabinet planning instructions