Siemens SINAMICS S120 Combi - Derating as a function of the installation altitude and ambient temperature

System overview
2.3 Derating as a function of the installation altitude and ambient temperature
SINAMICS S120 Combi
32 Manual, 11/2017, 6SL3097-4AV00-0BP7
2.3
Derating as a function of the installation altitude and ambient
temperature
The S120 Combi Power Modules are designed for operation at an ambient temperature of
45° C, installation altitudes up to 1000 m above sea level and the specified pulse frequency.
The air pressure and therefore air density drop at altitudes above sea level. At these
altitudes, the same quantity of air does not have the same cooling effect and the air gap
between two electrical conductors can only insulate a lower voltage. Typical values for air
pressure are summarized in the table below:
Table 2- 5 Air pressure for various installation altitudes
Installation altitude above sea level
in [m]
0 2000 3000 4000 5000
Air pressure in mbar [kPa]
100
80
70
62
54
The output current must be reduced if the Combi Power Modules are operated at ambient
temperatures above 45° C. Ambient temperatures above 55° C are not permissible.
Figure 2-3 Output current depending on the ambient temperature
Further information about derating the output current of Combi Power Modules can be found
in Section "System data (Page 30)".