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Mounting and temperature conditionsDerating curvesThe curves illustrate the drive nominal current derating percentage (I/In%) as a function of the temperature, switching frequency, and thetype of mounting.For example, 80% derating of a 20 hp, 460 V ATV<strong>21</strong> drive nominally rated for 30.5 amperes continuously: 30.5 x 0.8 = 24.4 (15 hp).For intermediate temperatures, interpolate between two curves.ATV<strong>21</strong>H075M3XI/In1009080706050406 8 10 12 14 1640 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C60 °C (140 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting type BSwitching frequency (kHz)ATV<strong>21</strong>HU15M3XI/In1009080706050406 8 10 12 14 1640 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting types A and C60 °C (140 °F) mounting type BSwitching frequency (kHz)AT<strong>21</strong>HU22M3XI/In100ATV<strong>21</strong>HU30M3X, ATV<strong>21</strong>HU40M3XI/In1009040 °C (104 °F) mounting types A, B and C9040 °C (104 °F) mounting types A, B and C80706050 °C (122 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting types A and C60 °C (140 °F) mounting type B80706050 °C (122 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting types A and C60 °C (140 °F) mounting type B5050406 8 10 12 14 16Switching frequency (kHz)406 8 10 12 14 16Switching frequency (kHz)ATV<strong>21</strong>HU55M3XI/InATV<strong>21</strong>HU75M3XI/In10090807040 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C60 °C (140 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting type B10090807040 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting types A and C60 °C (140 °F) mounting type B60605050406 8 10 12 14 16Switching frequency (kHz)406 8 10 12 14 16Switching frequency (kHz)ATV<strong>21</strong>HD11M3XI/InATV<strong>21</strong>HD15M3XI/In10090807040 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C60 °C (140 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting type B10090807040 °C (104 °F) mounting types A, B and C50 °C (122 °F) mounting types A and C50 °C (122 °F) mounting type B60 °C (140 °F) mounting types A and C60 °C (140 °F) mounting type B60605050406 8 10 12 14 16Switching frequency (kHz)406 8 10 12 14 16Switching frequency (kHz)13
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