General Information On Ventilation - Siemens SINAMICS S120 Manual

12.11.2

General information on ventilation

SINAMICS components are force-ventilated using integrated fans, in some cases through
natural convection and also customized cooling methods. The fans are not equipped with
temperature-dependent speed control; only the states "on" or "off" exist.
Fan operation up to firmware version 2.5
The fans are switched on and switched off as a function of the heat sink temperature.
The fans start to run at a specific heat sink temperature for the particular device. They switch
themselves off with a small hysteresis as soon as the heat sink temperature falls below this
threshold. The run-on time of the fan depends on various factors such as ambient
temperature, output current, duty cycle and, therefore, cannot be determined directly.
Fan operation as of firmware version 2.6
The fans can be controlled as a function of the heat sink temperature.
The fans start to run at a specific heat sink temperature for the particular device – or when a
pulse enable is set. They switch themselves off with a small hysteresis as soon as the heat
sink temperature, which has been saved, is fallen below and there is no pulse enable. The
fan run on time can be parameterized (see SINAMICS S120/S150 List Manual).
Note
For the 5 kW and 10 kW Smart Line Modules, the fan runs permanently.
Air guidance
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.
Danger to life if the fundamental safety instructions and remaining risks are not carefully
observed
If the fundamental safety instructions and remaining risks in Chapter 1 (Page 27) are not
observed, accidents involving severe injuries or death may occur.
• Adhere to the fundamental safety instructions.
• When assessing the risk, take into account residual risks.
Booksize Power Units
Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8
WARNING
Cabinet design and EMC Booksize
12.11 Notes on electrical cabinet cooling
747