Siemens SINAMICS S120 Manual page 43
Cabinet modules
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Reducing the ambient temperature and the output current
Due to the reduced cooling efficiency, it is necessary, on the one hand, to reduce the
ambient temperature and, on the other, to lower heat loss in the Cabinet Module by reducing
the output current, whereby ambient temperatures lower than 40 °C may be offset to
compensate. The following tables specify the permissible output currents as a function of the
installation altitude and ambient temperature for the various degrees of protection. The
specified values already take into account the permissible compensation between installation
altitude and ambient temperature less than 40 °C (air intake temperature where the air
enters the Cabinet Module). The values apply under the precondition that the cooling air flow
through the devices – as specified in the technical data – is guaranteed as a result of the
cabinet installation.
Table 2- 5
Current derating as a function of ambient temperature (inlet air temperature at the air inlet of the cabinet unit)
and installation altitude for cabinet units with degree of protection IP20/IP21/IP23/IP43
Installation altitude
above sea level in m
0 ... 2000
... 2500
... 3000
... 3500
... 4000
... 4500
... 5000
Table 2- 6
Current derating as a function of the ambient temperature (inlet air temperature at the air inlet of the cabinet
unit) and installation altitude for cabinet units with degree of protection IP54
Installation altitude
above sea level in m
0 ... 2000
... 2500
... 3000
... 3500
... 4000
... 4500
... 5000
Cabinet Modules
Manual, 03/2013, A5E03263538A
at an ambient temperature (air intake temperature) of
20 °C
25 °C
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
97.5 %
98.2 %
at an ambient temperature (air intake temperature) of
20 °C
25 °C
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
100 %
96.3 %
97.5 %
92.1 %
93.0 %
Current derating factor
30 °C
35 °C
100 %
100 %
100 %
100 %
100 %
98.7 %
100 %
96.3 %
Current derating factor
30 °C
35 °C
100 %
100 %
100 %
96.3 %
98.7 %
92.5 %
94.7 %
90.7 %
System overview
2.11 Derating data
40 °C
45 °C
100 %
93.3 %
96.3 %
40 °C
45 °C
93.3 %
86.7 %
89.8 %
50 °C
86.7 %
50 °C
80.0 %
41
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