This motor speed controller is suitable for AC 220/240V 50/60HZ motors. Speed regulation range is 90-1400r/min at 50Hz and 90-1700r/min at 60Hz. Ideal for use in packaging, printing, food processing, electronics, instrumentation, and garment industry production lines as a speed control drive device. The controller features high-quality electronic circuits and integrated components for enhanced durability. Compact design, high precision, wide speed control range, and long service life. Instructions for use: 1. Turn off the power supply before connecting. Wire according to the diagram and ensure all connections are correct. 2. Securely mount the controller and set the speed to the lowest position "0" before startup to prevent sudden current surge and potential damage. 3. Turn on the power and gradually adjust the speed knob to the desired level. Always turn off the power when not in use. 4. The governor connects directly to the motor. If motor torque or speed does not meet requirements, adjust the fine-tuning potentiometer located on the side of the unit. 5. To change the motor rotation direction, swap the jumper wires between "CCW" and "CW" on the back of the controller. 6. Connect COM and CW for clockwise rotation. 7. Connect COM and CCW for counterclockwise rotation. Color: Black Material: ABS Package Contents: 1 x Motor Speed Controller (Other items not included) Note: Lighting and display differences may cause slight color variations between the image and actual item. Measurement tolerance: +/- 1-3 cm.