Siemens SINAMICS S120 Equipment Manual page 225

Requirement for air distribution baffle ("A")
With a single unit (Power Module, Basic Line Module, Active Line Module or Motor Module)
or Motor Module with Basic Line Module / Active Line Module installed adjacent: Air
distribution baffle A is closed, the side openings ensure adequate distribution of air flow.
For configurations with several modules mounted adjacently, air distribution baffle A must be
perforated. The perforation must be designed such that up to 60% of the opening area is in
the lower module half (in the Figure above, between X1 and X2).
Housing for air guidance
The fan(s) can suck the air out of the module only if air cannot be sucked in between the
module and the fan. A housing (enclosure) must therefore be provided between the fan and
the module.
Motor connection cover
The motor connection on a horizontally mounted module must be covered. This cover must
be perforated. The perforations should have an opening area of 8 x 30 mm with a perforation
spacing of 3 to 5 mm.
Figure 7-2 Example of a protective cover for the motor connection
Chassis Liquid Cooled Power Units
Manual, (GH7), 01/2011, 6SL3097-4AM00-0BP1
Cabinet design and EMC
7.3 Horizontal installation
223