Please see attached for the BLS series brushless motor/driver datasheet which includes the information you need. See page 2 for information on external potentiometer, internal potentiometer, and external analog voltage. All 3 can be used to set the speed of your motor.
For external potentiometer, you would wire your 20 Kohm, 1/4W potentiometer's 3 terminals to driver screw terminals 5, 6, and 7. Both the START/STOP, RUN/BRAKE inputs need to be ON in order for the motor to rotate.
Please let me know if you have any questions.
- BLS English.pdf
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