I just switched from one 600 k W VSD to a 900 k W one. The 600 k W was used on a V/F mode and the motor, a 600 k W 400 V one, was working within it`s current range. The 900 k W drive is configured on the direct torque control algorithm and the motor is drawing constantly much more than the rated current of the motor within the speed range but the k W rating is not exceeded. I belive that the 900 k W drive is underfluxing the motor !
Any comment !
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