The motor can be either positive or negative. When the direction of operation and expectations do not match, you can adjust the line order to change the direction. Adjust the potentiometer knob to change the governor output duty cycle, the motor speed changes.
Note: Please do not directly connected to the AC (for example:home 220V AC ),otherwise it will burn! The positive and negative terminals of the DC power supply are not reversed, otherwise the governor may be damaged.