Cabinet design and EMC for components, Blocksize format
10.7 Notes on electrical cabinet cooling
SINAMICS S110
242 Manual, 07/2015, 6SL3097-4AC10-0BP5
If air conditioners are used, you must consider that 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 25)). 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 heating.
Power loss of components during rated operation
10.7.3.1
The tables below give details of power loss for components during rated operation. The
characteristic values apply for the following conditions:
● Line voltage for Power Modules:
– 1/3 AC 200 ... 240 V with permissible deviation
– 3 AC 380 ... 480 V with permissible deviation
● Rated pulse frequency of the Power Modules
● Operating components at their unit rating
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