Derating Factors As A Function Of Installation Altitude - Siemens SINAMICS S120 Equipment Manual

3.2.9.3

Derating factors as a function of installation altitude

When the units are operated at an installation altitude with reduced air pressure, the derating
characteristic shown below applies to the output current or the ambient air temperature.
Figure 3-16
At installation altitudes above 2000 m (6562 ft), the line voltage must not exceed certain
limits to ensure that surge voltages can be insulated in accordance with IEC 61800-5-1 for
surge voltage category III. If the line voltage is higher than this limit at installation altitudes >
2000 m (6562 ft), measures must be taken to reduce transient category III surge voltages to
category II values, e.g. equipment must be supplied via an isolating transformer.
Water-cooled chassis power units for common cooling circuits
Manual, 08/2017, 6SL3097-4AM10-0BP0
Maximum ambient temperature as a function of installation altitude
Line-side power components
3.2 Active Interface Modules
73