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Technical specifications
6.5 Ambient temperature
6.5
Ambient temperature
Restrictions of the maximum specified ambient temperature
The maximum permissible temperatures of the module for altitudes up to 2000 m can be
found above in the technical specifications.
When using the module at higher altitudes, the decrease in the cooling effect due to
convection as a result of the lower air pressure must be taken into account. According to
IEC 61010-2-201 CD2 2015, the temperature at altitudes > 2000 m must be reduced.
The following derating factors and maximum ambient temperatures apply.
Table 6- 2
Installation altitude
(Height above mean
sea level)
-1000 m to 2000 m
2000 m to 3000 m
3000 m to 4000 m
4000 m to 5000 m
Basic value for applying the derating factor is the maximum permissible ambient temperature in °C
1)
Note
• The derating factors compensate for the decreasing cooling effect of air at higher altitudes
due to lower density.
• Linear interpolation between altitudes is permissible.
56
Restrictions of the maximum permissible ambient temperature in relation to the
installation altitude
Derating factor
for 2000 m.
Maximum ambient temperature when the rack is
1)
1.00
0.93
0.86
0.78
Operating Instructions, 04/2023, C79000-G8976-C355-05
mounted horizontally
60 °C
56 °C
52 °C
47 °C
SIMATIC CM 1542-1
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