Siemens SINAMICS S120 Combi Equipment Manual page 314

Cabinet design and EMC
12.9 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. If the relative humidity of the air
entering the SINAMICS equipment is over 80% for an extended period of time, the insulation
in the equipment may fail to function properly due to electrochemical reactions (refer to
Section System overview (Page 29)). Using air baffle plates, for example, you must ensure
that the cold air expelled from the air conditioner mixes with warm air in the cabinet before it
enters the unit. This reduces the relative air humidity to uncritical values.
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SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5