Ventilation - Siemens SINUMERIK 840D sl Manual

2.6.3

Ventilation

The SINAMICS equipment is ventilated separately by means of integrated fans and is in
some cases cooled by means of natural convection.
The cooling air must flow through the components vertically from bottom (cooler region) to
top (region heated by operation).
If filtered fans, heat exchangers, or air conditioners are used, you must ensure that the air is
flowing in the right direction. You must also ensure that the warm air can escape at the top.
A ventilation clearance of at least 80 mm above and below must be observed.
Note
Cables must not be routed on the components; ventilation screens must not be covered.
Cold air must not be allowed to blow directly onto electronic equipment.
Note
The distance between the blow-out aperture of the air conditioner and the electronic
equipment must be at least 200 mm.
Note
If the components are installed in a sealed cabinet, an internal air cooling system must be
installed to circulate the air and prevent hot spots. It is best to install the fan above the
components to optimize the air flow (suction).
Guide for the SINUMERIK 840D sl machine configuring
Manual, 07/2006 Edition, 6FC5397-6CP10-0BA0
Structure of the drive group
2.6 Heat Dissipation of the Control Cabinet
2-29