338 Technical data SizingDrive sizing is based on the rated motor current and power. To achieve the ratedmotor power given in the table, the rated current of the drive must be higher than orequal to the rated motor current. The rated power of the drive must also be higherthan or equal to compared to the rated motor power. The power ratings are the sameregardless of the supply voltage within one voltage range.In multimotor systems, the drive output current rating ILD must be equal to or greaterthan the calculated sum of the input currents of all motors.Note:• The maximum allowed motor shaft power is limited to 1.5 · PN. If the limit isexceeded, motor torque and current are automatically restricted. The functionprotects the input bridge of the drive against overload.• The ratings apply at ambient temperature of 40 °C (104 °F) for I2N and 50 °C(122 °F) for ILD. DeratingI2N : The load capacity decreases if the installation site ambient temperature exceeds40 °C (104 °F) or if the altitude exceeds 1000 meters (3300 ft) or the switchingfrequency is changed from 4 kHz to 8, 12 or 16 kHz.ILD : The load capacity decreases if the altitude exceeds 1000 meters (3300 ft) or theswitching frequency is changed from 4 kHz to 8, 12 or 16 kHz.Temperature derating, I2NIn the temperature range +40 °C…+50 °C (+104 °F…+122 °F), the rated outputcurrent (I2N ) is decreased by 1% for every additional 1 °C (1.8 °F). The output currentis calculated by multiplying the current given in the rating table by the derating factor.Example: If the ambient temperature is 50 °C (+122 °F), the derating factor is100% - 1 · 10 °C = 90% or 0.90. The output current is then 0.90 · I2N.Altitude derating, I2N and ILD (= all currents)In altitudes 1000…2000 m (3300…6600 ft) above sea level, the derating is 1% forevery 100 m (330 ft).%°C
