Installation Altitudes Between 2000 M And 5000 M Above Sea Level - Siemens SINAMICS G150 Operating Instructions Manual

Technical specifications
12.2 General data
12.2.1.2

Installation altitudes between 2000 m and 5000 m above sea level

If the SINAMICS G150 cabinet 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 cabinet 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 tables specify the
permissible output currents as a function of installation altitude and ambient temperature for
the different degrees of protection. 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 cabinet 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- 4 Current derating as a function of ambient temperature (inlet air temperature at the air inlet of the cabinet unit)
and installation altitude for cabinet units with degree of protection IP20/IP21/IP23/IP43
Installation altitude
above sea level in m
0 ... 2000
... 2500
... 3000
... 3500
... 4000
... 4500
... 5000
648
at an ambient temperature (air inlet temperature) of
20° C 25° C
100 % 100 %
100 % 100 %
100 % 100 %
100 % 100 %
100 % 100 %
100 % 97.5 %
98.2 %
Current derating factor
30° C 35° C
100 % 100 %
100 % 100 %
100 % 98.7 %
100 %
96.3 %
Operating Instructions, 07/2016, A5E03347396A
40° C 45° C
100 % 93.3 %
96.3 %
Converter cabinet units
50° C
86.7 %