Siemens SINAMICS G150 Operating Instructions Manual page 584

Technical specifications
12.2 General data
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 specifications.
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
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at an ambient temperature (air intake 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 %
40 °C 45 °C
100 % 93.3 %
96.3 %
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
50 °C
86.7 %