Derating Data; Permissible Output Current As A Function Of The Ambient Temperature; Derating Values For Installation Altitudes Between 1000 M And 4000 M Above Sea Level - Siemens Sinamics G120P Operating Instructions Manual

11.2.1

Derating data

11.2.1.1

Permissible output current as a function of the ambient temperature

The cabinet units and the associated system components are dimensioned for an ambient
temperature of 40° C. The output current must be reduced if the cabinet devices are
operated at ambient temperatures above 40° C. Ambient temperatures above 50° C are not
permissible.
Figure 11-1
11.2.1.2

Derating values for installation altitudes between 1000 m and 4000 m above sea level

If the SINAMICS G120P Cabinet units are operated at an installation altitude >1000 m above
sea level, it must be taken into account that the air pressure and, consequently, the air
density decreases. The lower air density also reduces the cooling efficiency and the
insulation capacity of the air.
Installation altitudes between 1000 m and 4000 m can be achieved by applying the following
measures.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
Permitted output current depending on the ambient temperature (inlet air temperature at
the air inlet of the cabinet unit)
Technical specifications
11.2 General data
471