Preventing The Recirculation Of Hot Air - ABB ACS880-04F Hardware Manual

44 Guidelines for planning the mechanical installation
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Equip the air inlets and outlets with gratings that
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guide the air flow
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protect against contact
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prevent water splashes from entering the cabinet.
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The drawing below shows a typical cabinet cooling solution when the heatsink is
outside the cabinet. The air inlet is at the bottom of the cabinet, while the outlet is at
the top, either on the upper part of the door or on the roof. ABB recommends that the
air outlet is on the cabinet roof.
1 Air inlet
2 Air outlet
•
The internal cooling fans of the drive modules and reactors/chokes are usually
sufficient to keep the component temperatures low enough in IP22 cabinets.
•
In IP54 cabinets, thick filter mats are used to prevent water splashes from entering the
cabinet. This requires the installation of additional cooling equipment, such as a hot air
exhaust fan.

Preventing the recirculation of hot air


Prevent hot air circulation outside the cabinet by leading the out coming hot air away from
the area where the inlet air to the cabinet is taken. Possible solutions are listed below:
•
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.
2
1
Air inlets and outlets on the cabinet door
2
1