Yes. Softstarts are used for reduced torque starting and stopping of standard 3-phase induction MOTORS (such as centrifugal pumps, compressors, ball mills, jar mills, fans, blowers and saws). If the motor is not adequately protected from sudden CHANGES in rotational torque associated with starting and stopping, the current will be excessive to the system and the motor will surge, causing DAMAGE to all the EQUIPMENT linked to it. Over the long term, this leads to increased over-current tripping and increased mechanical wear of gearboxes, clutches, transmission and conveyor systems. ANSI/IEEE Std. 141-1993 (Red Book) provides a COMPARISON of different reduced voltage starting methods. An electronic softstart of VFD, although not listed, would have similar characteristics to the autotransformer starter.

Yes. Softstarts are used for reduced torque starting and stopping of standard 3-phase induction motors (such as centrifugal pumps, compressors, ball mills, jar mills, fans, blowers and saws). If the motor is not adequately protected from sudden changes in rotational torque associated with starting and stopping, the current will be excessive to the system and the motor will surge, causing damage to all the equipment linked to it. Over the long term, this leads to increased over-current tripping and increased mechanical wear of gearboxes, clutches, transmission and conveyor systems. ANSI/IEEE Std. 141-1993 (Red Book) provides a comparison of different reduced voltage starting methods. An electronic softstart of VFD, although not listed, would have similar characteristics to the autotransformer starter.