Siemens Sinamics S120 Manual page 306

Cabinet design and EMC
8.3 Cabinet installation, vertical and horizontal installation
Note
Note regarding horizontal installation
If the measures recommended above are not implemented, the equipment might malfunction
during operation at air temperatures as low as approx. 30° C. This is because the current
transformers would be overheated!
Vertical installation
Note
Notes for installation in control cabinets
No additional measures need to be taken if the modules are mounted in a cabinet with
degree of protection up to IP21.
However, if they are mounted in a cabinet with a degree of protection higher than IP21, a fan
must be installed above the modules to avoid the formation of hotspots.
The table below specifies the required volumetric flows and the average rates of flow within a
canopy (400 mm high).
If a single module is installed in a cabinet with IP54 degree of protection, then the fan can be
dispensed with if the required volumetric flow for the module is <0.01 m³/s.
If several modules are installed in the same cabinet, then the required volumetric flow
corresponds to the total volumetric flows of the individual components.
In configurations where a number of cabinet canopies are interconnected, the total
volumetric flow must also be calculated and a fan selected accordingly.
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Liquid-cooled chassis power units
Manual, (GH7), 11/2016, 6SL3097-4AM00-0BP7