Siemens SINAMICS S120 Equipment Manual page 104

Line Modules
4.3 Active Line Modules
Derating factors as a function of ambient temperature
The units can supply 100 % output current at an ambient air temperature of between 0 °C
and 45 °C. The maximum output current decreases linearly to 90 % at ambient air
temperatures of between 45 °C and 50 °C.
Fig. 4-24
Derating factors as a function of installation altitude
When the units are operated at an installation altitude with reduced air pressure, the derating
characteristic shown below applies to the output current or the ambient air temperature.
Fig. 4-25
4-36
110
100
90
80
70
60
50
40
30
20
10
0
-20 -10
0 10
Ambient temperature [°C]
h < 2000 m
Maximum output current as a function of ambient temperature
60
50
40
30
20
10
0
0
1000
Site altitude in m above sea level
Maximum ambient temperature at 90 % current load
Maximum ambient temperature at 100 % current load
Maximum ambient temperature as a function of installation altitude
20 30 40
2000 3000
SINAMICS S120 Equipment Manual, Edition 12/2007, 6SL3097-2AM00-0BP4
50 60
4000
Chassis Power Units Liquid Cooled