Siemens Sinamics S120 Manual page 767

Booksize power units

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To optimize usage of the external air heat sink, it is best to arrange the components in such

a way that the heat is dissipated equally over the surface of the external heat sink. This

means that, if possible, a large power section should be situated next to a smaller one. The

current carrying capacity of the DC-link busbars must be taken into account here.

Figure 12-36 Rear view of a control cabinet with drive line-up, cold plate and external air heat sink

In this example, two axial fans with a diameter of 150 mm ensure forced convection. The

ribbed heat sink, which is attached to the rear, is located in an air duct (approx. 150 mm

deep). Additional air guides at the sides improve air guidance and significantly optimize the

power unit cooling.

The external heat sink must be sealed with respect to the control cabinet in accordance with

Booksize Power Units

Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6

Control cabinet

External fan

Air baffle plates

External air heat sink

Cabinet design and EMC Booksize

12.11 Information on cold plate cooling