Technical data 181 DeratingAmbient temperature deratingIn the temperature range +40…50 °C (+104…122 °F), the rated output current is deratedby 1% for every added 1 °C (1.8 °F). The output current can be calculated by multiplyingthe current given in the rating table by the derating factor (k):Altitude deratingAt altitudes from 1000 to 4000 m (3300 to 13123 ft) above sea level, the output currentderating is 1% for every 100 m (328 ft). If ambient temperature is below +40 °C (+104 °F),the derating can be reduced by 1.5% for every 1 °C reduction in temperature. For a moreaccurate derating, use the DriveSize PC tool. A few altitude derating curves are shownbelow.T1.000.90+40 °C+104 °F+50 °C+122 °Fk0.80
