Siemens SINAMICS S120 Combi Manual page 298

Cabinet design and EMC
12.8 Note on control cabinet cooling
Note
The distance between the discharge opening of the air condition equipment and the
electronic equipment must be at least 200 mm.
Note
If the components are installed in a sealed control cabinet, an internal air cooling system
must be installed in the control cabinet to circulate the air and prevent hot spots. It is best to
install the fan above the components to optimize the air flow (suction).
Figure 12-7 Examples of cabinet ventilation
If air conditioners are used, the relative air humidity of the expelled air increases as the air in
the air conditioner cools and may exceed the dew point. To avoid condensation, climate
control equipment should be arranged so that cold discharged air is not directly blown onto
SINAMICS components. Using air guidance baffles, ensure that the air is adequately mixed
with the air inside the cabinet. This reduces the relative air humidity to uncritical values.
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SINAMICS S120 Combi
Manual, 11/2017, 6SL3097-4AV00-0BP7