• Contact Yaskawa or your nearest sales representative to use a non-Yaskawa PM motor.

  • You cannot operate a PM motor from a commercial power supply. If you must operate from a commercial power supply, use an induction motor.

  • You cannot operate more than one PM motor from one drive. Use an induction motor and a variable-speed control drive.

  • In Open Loop Vector Control for PM motor (OLV/PM), the motor can operate in the reverse direction for 1/2 turn (electrical angle) at start up.

  • The quantity of generated starting torque changes when the control method and motor type change. Verify the starting torque, permitted load characteristics, impact load tolerance, and speed control range before you set up the motor with the drive. Contact Yaskawa or your nearest sales representative to use a motor that does not meet these specifications.

  • In OLV/PM control, braking torque is always 125% or less when operating between 20% and 100% speed. A braking resistor unit will not change the value. Braking torque is 50% or less when operating at 20% speed or less.

  • In OLV/PM control, the allowable load inertia moment is approximately 50 times higher than the motor inertia moment. Use Closed Loop Vector Control for PM motors for applications with a larger inertia moment.

  • When you use a holding brake in OLV/PM control, release the brake before you start the motor. Failure to set the correct timing can cause a decrease in speed. Do not use these configurations in applications with heavy loads, for example conveyors or elevators.

  • To restart a coasting motor that is rotating faster than 200 Hz in V/f Control, first use the Short Circuit Braking function to stop the motor. A special braking resistor unit is necessary for Short Circuit Braking. Contact Yaskawa or your nearest sales representative for more information.

    To restart a coasting motor that is rotating slower than 200 Hz, use the Speed Search function.

    If the motor cable is long, use Short Circuit Braking to stop the motor.

    Note:

    The Short Circuit Braking function uses the drive to forcefully cause a short across the motor wires to stop the motor before it has time to coast to a stop.

  • You can also use EZ Open Loop Vector Control (EZOLV) to operate synchronous reluctance motors (SynRM). Contact Yaskawa or your nearest sales representative for more information.

  • After you replace a failed PM motor encoder, make sure that the motor can rotate and do Z Pulse Offset Tuning or PM Rotational Auto-Tuning.

  • If oC [Overcurrent], STPo [Motor Step-Out Detected], or LSo [Low Speed Motor Step-Out] occur during restart, try Speed Search again and use the Short Circuit Braking function when you start to adjust the motor.