Technical specifications
12.2 General technical specifications
Drive converter cabinet units
Operating Instructions, 07/07, A5E00288214A
477
12.2.1 Derating data
Current derating as a function of the site altitude and ambient temperature
If the cabinet units are operated at a site altitude >2000 m above sea level, the maximum
permissible output current can be calculated using the following tables. The site altitude and
ambient temperature are compensated here. The degree of protection selected for the
cabinet units must also be taken into account.
Table 12-2 Current derating as a function of ambient temperature (inlet air temperature at the air inlet of the cabinet unit)
and site altitude for cabinet units with degree of protection IP20/IP21/IP23/IP43
Ambient temperature in °C
Site altitude above
sea level in m
20 25 30 35 40 45 50
0 to 2000 100% 95.0% 87.0%
Up to 2500 100% 96,3% 91.4% 83.7%
Up to 3000 100% 96.2% 92.5% 87.9% 80.5%
Up to 3500 100% 96.7% 92,3% 88.8% 84,3% 77,3%
Up to 4000 100% 97.8% 92.7% 88.4% 85.0% 80.8% 74.0%
Table 12-3 Current derating as a function of the ambient temperature (inlet air temperature at the air inlet of the cabinet
unit) and site altitude for cabinet units with degree of protection IP54
Ambient temperature in °C Site altitude above
sea level in m
20 25 30 35 40 45 50
0 to 2000 100% 95.0% 87.5% 80.0%
Up to 2,500 100% 96.3% 91.4% 84.2% 77.0%
Up to 3,000 100% 96.2% 92.5% 87.9% 81.0% 74.1%
Up to 3,500 100% 96.7% 92.3% 88.8% 84.3% 77.7% 71.1%
Up to 4,000 97.8% 92.7% 88.4% 85.0% 80.8% 74.7% 68.0%
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