PrimaryFeedbackResolution Parameter

The PrimaryFeedbackResolution specifies the resolution of the feedback device that is connected to the primary input on the drive.

If you set the MotorType Parameter to ACBrushlessLinear or ACBrushlessRotary and the FeedbackInput1 Parameter to PrimaryFeedback, then the drive uses the value of the PrimaryFeedbackResolution parameter to commutate the motor. You must set this parameter to the correct value. Aerotech recommends that you use Machine Setup to correctly configure this parameter for your mechanical device.

For an AC Brushless Linear motor, you must use a linear feedback device for motor commutation, and you must specify this parameter in units of microns per count.

For an AC Brushless Rotary motor, you must use a rotary feedback device for motor commutation, and you must specify this parameter in units of counts per revolution.

If you set the MotorType parameter to StepperMotor or ThreePhaseStepper and the FeedbackInput1 parameter to PrimaryFeedback, then the drive uses the value of the PrimaryFeedbackResolution parameter to convert the position command received from the controller from feedback counts into microsteps. For this configuration, you must specify this parameter in units of counts per revolution. If you use a linear feedback device with a stepper motor, then you need to convert the resolution of the feedback device into counts per revolution of the motor by taking into consideration the mechanical coupling (e.g., ballscrew, gear box, etc.) that exists between the motor and feedback device.

If you set the PrimaryFeedbackType Parameter to IncrementalEncoderSineWave, then you must also include the value of the PrimaryEncoderMultiplicationFactor Parameter when you set the value of the PrimaryFeedbackResolution parameter. In other words, the value that you specify for this parameter represents the resolution of the feedback device as it is seen by the drive, including any multiplication.