Notes On Electrical Cabinet Cooling; Control Cabinet Cooling Options; General Information On Ventilation - Siemens Sinamics S120 Manual

12.12

Notes on electrical cabinet cooling

12.12.1

Control cabinet cooling options

The following options are available for cooling the control cabinet:
● Filter fans
● Heat exchangers
● Cooling unit
● Liquid cooling
● External air cooling
● External liquid cooling
The prevailing environmental conditions and the cooling power required define the method
used to cool the control cabinet.
The air routing within the control cabinet and the cooling clearances specified must be
observed. No components may be mounted and no cables routed in the cooling clearance
spaces.
Note
Reduction of the component service lives through incorrect mounting
If you do not observe the guidelines for mounting SINAMICS components in the cabinet, this
can reduce the service life of the equipment and result in premature component failure.
You must take into account the following specifications when installing a SINAMICS drive
line-up:
● Ventilation clearance
● Wiring and cabling
● Air guidance, air-conditioner
12.12.2

General information on ventilation

SINAMICS components are force-ventilated using integrated fans, and in some cases
through natural convection. 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.
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
Cabinet design and EMC Booksize
12.12 Notes on electrical cabinet cooling
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