Planning the cabinet assembly
29
Cooling and degrees of protection
The cabinet must have enough free space for the components to ensure sufficient
cooling. Observe the minimum clearances given for each component.
The air inlets and outlets must be equipped with gratings that
• guide the air flow
• protect against contact
• prevent water splashes from entering the cabinet.
The drawing below shows two typical cabinet cooling solutions. 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.
Arrange the cooling air flow through the modules so that the requirements given in
chapter Technical data are met:
• cooling air flow
Note: The values in Technical data apply to continuous nominal load. If the load is cyclic or less
than nominal, less cooling air is required.
• allowed ambient temperature
• the air inlet and outlet sizes required for the module cooling and recommended
filter material (if used).
In addition to the above, the heat dissipated by cables and other additional
equipment must also be ventilated.
The internal cooling fans of the modules are usually sufficient to keep the component
temperatures low enough in IP22 (UL type 1) cabinets.
Air inlet
Air outlet
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