When selecting AC drive size and power ratings, consider the operating profile of the load it will drive. Will the loading be constant or variable? Will there be frequent starts and stops, or will operation be continuous?

Consider both torque and peak current. Obtain the highest peak current under the worst operating conditions. Check the motor FLA, which is located on the motor’s nameplate. Note that if a motor has been rewound, its FLA may be higher than what’s indicated on the nameplate.

Don’t choose the AC drive size according to horsepower ratings. Instead, choose the AC drive to the motor at its maximum current requirements at peak torque demand. The AC drive must satisfy the maximum demands placed on the motor.