Siemens SINAMICS Series Operating Instructions Manual page 77

4.6 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 via p50077.
Intermediate values can be obtained through linear interpolation.
Note
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 595)".
Table 4- 45 Derating factor for units up to 125 A (with natural air cooling, cooling type AN)
Installation
altitude above
15 °C
sea level
Up to 1000 m 1.00
Up to 2000 m 1.00
Up to 3000 m 1.00
Up to 4000 m 1.00
Up to 5000 m 0.92
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
15 °C
sea level
Up to 1000 m 1.00
Up to 2000 m 1.00
Up to 3000 m 1.00
Up to 4000 m 0.93
Up to 5000 m 0.83
x ... SINAMICS DCM operation not possible
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
Ambient or coolant temperature
20 °C 25 °C 30 °C
1.00 1.00 1.00
1.00 1.00 1.00
1.00 1.00 0.96
0.98 0.92 0.86
0.86 0.80
Ambient or coolant temperature
20 °C 25 °C 30 °C
1.00 1.00 1.00
1.00 1.00 0.98
0.98 0.93 0.88
0.88 0.83 0.78
0.78 0.73
35 °C 40 °C
1.00 1.00
1.00 0.94
0.90 0.84
0.80 x
x x x
35 °C 40 °C
1.00 1.00
0.93 0.88
0.83 0.78
0.73 x
x x x
Technical data
4.6 Derating
45 °C 50 °C 55 °C
1.00 0.94 0.88
0.88 0.82
x x
x x
x x
45 °C 50 °C 55 °C
0.95 0.90
0.83 0.78
x x
x x
x x
x
x
x
x
x
x
x
x
x
75