Installation Altitudes Between 2000 M And 5000 M Above Sea Level - Siemens SINAMICS G130 Operating Instructions Manual

Technical specifications
12.2 General specifications
12.2.1.2

Installation altitudes between 2000 m and 5000 m above sea level

If the SINAMICS G130 converter units are operated at an installation altitude >2000 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 2000 m and 5000 m can be achieved by applying the following
measures.
Reduce the ambient temperature and the output current
Due to the reduced cooling efficiency, it is necessary, on the one hand, to reduce the
ambient temperature and, on the other, to lower heat loss in the converter unit by reducing
the output current, whereby ambient temperatures lower than 40° C may be offset to
compensate, and are taken into account in the tables. The following table specifies the
permissible output currents as a function of the installation altitude and ambient temperature.
The specified values already include a permitted correction in respect of installation altitude
and ambient temperatures less than 40° C (incoming air temperature at the inlet to the
converter unit). The values apply under the precondition that the cabinet layout ensures a
cooling air flow though the units as stated in the technical data.
Table 12- 3 Current derating as a function of ambient temperature and installation altitude
Installation altitude
above sea level in m
0 ... 2000
... 2500
... 3000
... 3500
... 4000
... 4500
... 5000
558
Current derating factor (in % of rated current)
at an ambient temperature (air inlet temperature) of
20° C 25° C
100 % 100 %
100 % 100 %
100 % 100 %
100 % 100 %
100 % 100 % 96.3 %
100 % 97.5 %
98.2 %
30° C 35° C
100 % 100 % 100 %
100 % 100 % 96.3 %
100 % 98.7 %
100 %
40° C 45° C 50° C
93.3 % 86.7 %
Operating Instructions, 07/2016, A5E00331449A
55° C
80.0 %
Inverter chassis units