Siemens SINAMICS S120 Combi - Line-side overcurrent protective devices

System overview
2.3 Derating as a function of the installation altitude and ambient temperature
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SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
2.3
Derating as a function of the installation altitude and ambient
temperature
The S120 Combi Power Modules and Motor Modules Booksize Compact are designed for
operation at an ambient temperature of 40 °C, installation altitudes up to 1000 m above sea
level and the relevant specified pulse frequency.
The air pressure and therefore air density drop at altitudes above sea level. At these
altitudes, the same quantity of air does not have the same cooling effect and the air gap
between two electrical conductors can only insulate a lower voltage. Typical values for air
pressure are summarized in the table below:
Table 2- 4 Air pressure for various installation altitudes
Installation altitude above sea level
in [m]
0 2000 3000 4000 5000
Air pressure in mbar [kPa]
100
80
70
62
54
Figure 2-3 Output current as a function of the installation altitude
The output current must be reduced if the modules are operated at ambient temperatures
above 40 °C. Ambient temperatures above 55 °C are not permissible.
At installation altitudes above 2000 m, the Power Modules must be connected using an
isolating transformer. The secondary line supply system must be implemented as follows:
● TN line supply with grounded star point (no grounded outer conductor)
● IT line supply
A reduction of the line supply voltage phase-phase is not necessary.