Siemens Sinamics PM250 Hardware Installation Manual page 62

Technical specifications
7.5 Restrictions for special ambient conditions
The Control Unit and operator panel can restrict the maximum permissible operating ambient
temperature of the Power Module.
Current derating or temperature reduction depending on the installation altitude
Above 1000 m above sea level you must reduce the inverter output current or the
permissible operating ambient temperature as a result of the lower cooling capability of the
air. Refer to the following diagrams for the values.
Permissible line supplies depending on the installation altitude
● Installation altitude up to 2000 m above sea level
– Connection to every supply system permitted for the inverter.
● Installation altitudes between 2000 m and 4000 m above sea level
– Connection to a TN system with grounded neutral point.
– TN systems with grounded line conductor are not permitted.
– The TN line system with grounded neutral point can also be supplied using an
– The phase-to-phase voltage does not have to be reduced.
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isolation transformer.
Hardware Installation Manual, 01/2016, A5E36265179B-AA
PM250 Power Module