Cabinet design and EMC for components, Blocksize format
10.9 Information on control cabinet cooling
AC Drive
446 Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
Figure 10-7 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 (see Chapter
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.
Damage caused by condensation
Condensation on the components can result in their failure.
• Select the air guidance and arrangement of the cooling equipment in such a way that no
condensation can form on the components. The distance between the discharge
opening of the air condition equipment and the electronic equipment must be at least
200 mm.
• If required, install cabinet enclosure heating.
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