Derating - Siemens SINAMICS DCM Operating Instructions Manual

4.4

Derating

Depending on the ambient temperature and the installation altitude, a derating is required for
the maximum permissible load of the SINAMICS DC MASTER.
The derating factor can be taken from the following tables and should be set at p50077.
Intermediate values can be obtained through linear interpolation.
NOTICE
Units with option L15 and use of the SINAMICS DCM in a SINAMICS DCM Cabinet drive
cabinet with option L99
In these cases, p50077 should be set according to Chapter "Sensor for the ambient and/or
air intake temperature (Page 444)".
Table 4- 45 Derating factor for units up to 125 A (with natural air cooling, cooling type AN)
Installation altitude
above sea level
1000 m
2000 m
3000 m
4000 m
5000 m
x ... SINAMICS DCM operation not possible
Table 4- 46 Derating factor for units from 210 A (with forced air cooling, cooling type AF)
Installation altitude
above sea level
1000 m
2000 m
3000 m
4000 m
5000 m
x ... SINAMICS DCM operation not possible
SINAMICS DCM DC Converter
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
30 °C 35 °C
1.00 1.00
1.00 1.00
0.96 0.90
0.86 0.80
0.78 x
30 °C 35 °C
1.00 1.00
0.98 0.93
0.88 0.83
0.78 0.73
0.70 x
Ambient or coolant temperature
40 °C 45 °C
1.00 1.00
0.94 0.88
0.84 x
x x
x x
Ambient or coolant temperature
40 °C 45 °C
1.00 0.95
0.88 0.83
0.78 x
x x
x x
Technical data
4.4 Derating
50 °C 55 °C
0.94 0.88
0.82 x
x x
x x
x x
50 °C 55 °C
0.90 x
0.78 x
x x
x x
x x
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