Emc Requirements - ABB ACS580-04 Hardware Manual

• gratings that guide air flow at the air inlet and outlet
• air inlet and outlet at different sides of the cabinet
• cool air inlet in the lower part of the front door, and an extra exhaust fan on the
roof of the cabinet.
Prevent hot air circulation inside the cabinet with, for example, leak-proof air baffles.
Usually, no gaskets are required.
The drawing below shows the air flow inside and outside the cabinet.
1 Air flow in
2 Power module
3 Hot air circulation to be prevented
4 Air flow out

EMC requirements

Note the following when you plan the electromagnetic compatibility of the cabinet:
• Generally, the fewer and smaller the holes in the cabinet, the better the interference
attenuation. The maximum recommended diameter of a hole in galvanic metal
contact in the covering cabinet structure is 100 mm (3.94 in). Pay special attention
to the cooling air inlet and outlet gratings.
• The best galvanic connection between the steel panels is achieved by welding
them together as no holes are necessary. If welding is not possible, ABB
recommends to leave the seams between the panels unpainted and equipped
with special conductive EMC strips to provide adequate galvanic connection.
Usually, reliable strips are made of flexible silicon mass covered with a metal mesh.
The non-tightened touch-contact of the metal surfaces is not sufficient, so a
Generic cabinet planning instructions 47