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 Primary Feedback, 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 The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion.. You must also 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 The action of steering currents to the proper motor phases to produce optimum motor torque/force. In brush-type motors, commutation is done electromechanically via the brushes and commutator. A brushless motor is electronically commutated using a position feedback device such as an encoder or Hall effect devices. Stepping motors are electronically commutated without feedback in an open-loop fashion.. You must also specify this parameter in units of counts per revolution.

If you set the MotorType parameter to StepperMotor or ThreePhaseStepper and the FeedbackInput1 parameter to Primary Feedback, 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 A precision device for translating rotary motion into linear motion. A lead screw is a lower cost, lower performance device performing the same function. Unit consists of an externally threaded screw and an internally threaded ball nut, gearbox, etc.) that exists between the motor and feedback device.

If you set the PrimaryFeedbackType Parameter to IncrementalEncoderSineWave, AbsoluteEncoderEnDatwithSineWaveIncremental, or AbsoluteEncoderBiSSwithSineWaveIncremental, then you must also include the value of the PrimaryEncoderMultiplicationFactor Parameter when you set the value of the PrimaryFeedbackResolution parameter. Thus, the value that you specify for this parameter shows the resolution of the feedback device as it is interpreted by the drive, which includes any multiplication factors.