Siemens PM250 - Operating temperature derating; Operational altitude derating

Technical specifications
PM250 Power Module
Hardware Installation Manual, 09/2012, A5E01003502B AD
47
Operating temperature derating
The operating temperature range is shown diagramatically in the figure below:
Ambient operating temperature [°C]
Permissible output base load current [%]
High overload (HO)
Ambient operating temperature [°C]
Permissible output base load current [%]
Light overload (LO)
100
75
74
50
25
0
010 20 30 40 50 60
100
50
25
0
010 20 30 40 50 60
75
66
Figure 6-1 Current derating for temperature
Operational altitude derating
The figures below show the derating required according to altitude.
Installation altitude above sea level [m]
[ft]
Permissible output base load current [%]
High overload (HO ) and light overload (LO)
0
100
90
80
70
60
1000
3300
2000
6600
3000
9800
4000
13000
Current derating for altitude
Installation altitude above sea level [m]
[ft]
Permissible input voltage [%]
0
100
90
80
77
70
60
1000
3300
2000
6600
3000
9800
4000
13000
Voltage derating for altitude
Siemens Parts