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1. Do not reverse polarity DC power supply positive and negative terminals£¬ otherwise the governor may be damaged. 2. 120W is a power supply 30V Maximum situation£¬ choose to stay when power margin! 3. The motor can be positive or negative£¬ regardless of when the direction is inconsistent with expectations£¬ you can adjust the line sequence to change direction. 4. Adjust the potentiometer knob can change the governor output duty cycle£¬ the motor speed change.