If the converters are operated at installation altitudes from 1000 m above sea level or at ambient/coolant temperatures > 40 °C for air cooling or with intake temperatures in the cooling unit > 35 °, derating factors kH or kT must be taken into account for the rated current (DIN 43671)...
1.00 0.95 0.90 5 10 20 Derating factor kT with air cooling 30 40 °C 45 Coolant temperature IGBT version Voltage derating At installation altitudes > 2000 m, a voltage derating is required in addition to a current correction (EN 60664-1/VDE 0110 (IEC 60664-1)). This depends on the air...