Siemens PM250 Hardware Installation Manual page 47

Operating temperature derating
The operating temperature range is shown diagramatically in the figure below:
Permissible output base load current [%]
High overload (HO)
100
75
74
50
25
Figure 6-1
Operational altitude derating
The figures below show the derating required according to altitude.
Permissible output base load current [%]
High overload (HO ) and light overload (LO)
100
Current derating for altitude
PM250 Power Module
Hardware Installation Manual, 09/2012, A5E01003502B AD
0
0 10 20 30 40
Ambient operating temperature [°C]
Current derating for temperature
90
80
70
60
0 1000 2000
3300 6600
Installation altitude above sea level [m]
Siemens Parts
Permissible output base load current [%]
Light overload (LO)
100
75
66
50
25
0
50 60 0
Permissible input voltage [%]
100
90
80
77
70
60
3000 4000
9800 13000
[ft]
Voltage derating for altitude
Technical specifications
10 20 30 40
Ambient operating temperature [°C]
0 1000 2000
3300 6600
Installation altitude above sea level [m]
50 60
3000 4000
9800 13000
[ft]
47