PWM DC Motor Speed Controller with Digital Display

1. Introduction

This manual provides comprehensive instructions for the installation, operation, and maintenance of your Gaqqee PWM DC Motor Speed Controller with Digital Display. This module is designed to precisely control the speed of DC brushed motors, offering a wide input voltage range and a clear digital display for speed percentage. Please read this manual thoroughly before use to ensure safe and efficient operation.

2. Safety Information

• Ensure the input voltage is within the specified range (DC10-55V) and matches the rated voltage of your motor.
• Do not connect to 220V household AC electricity. This device is for DC power only.
• Always disconnect power before making any wiring connections or adjustments.
• Observe correct polarity for power input (positive to positive, negative to negative). Incorrect polarity can damage the device.
• Ensure all connections are secure to prevent short circuits or loose contacts.
• Keep the device away from moisture, dust, and extreme temperatures.
• This device is not suitable for electric cars, including electric car motors.

3. Specifications

Note: Specifications are subject to change without prior notice.

4. Package Contents

The package includes:

• 1x PWM DC Motor Speed Controller (DC10-55V Digital Display 0~100% Adjustable Drive Module Input MAX 60A 12V 24V 36V 48V)

5. Setup and Wiring

Refer to the diagram and video below for proper wiring. Ensure all power is disconnected before making any connections.

1. Power Input Connection:
   • Locate the main terminal block on the controller board.
   • Connect the positive (+) lead from your DC power supply (10-55V) to the '+' terminal.
   • Connect the negative (-) lead from your DC power supply to the '-' terminal.
   • Ensure the input voltage matches your motor's rated voltage.
2. Motor Connection:
   • Locate the motor terminal block (often labeled 'MOTOR' or similar).
   • Connect the motor's leads to these terminals. The polarity here will determine the initial direction of rotation. If you wish to reverse the motor's direction without using the dedicated switch, you can swap these connections.
3. Digital Display Connection:
   • Connect the 4-pin connector from the digital display module to the corresponding 4-pin header on the controller board. Ensure correct orientation.
4. Potentiometer Connection:
   • Connect the 3-pin connector from the potentiometer (speed control knob) to its designated 3-pin header on the controller board. Ensure correct orientation.
5. Forward/Reverse Switch Connection:
   • Connect the 2-pin connector from the forward/reverse switch to its designated 2-pin header on the controller board. Ensure correct orientation.
6. Secure Connections:
   • Using a screwdriver, carefully tighten all terminal screws to ensure firm contact and prevent loose connections.

Figure 1: Top view of the controller board showing connection points.

Figure 2: Controller board with digital display, potentiometer, and switch.

Figure 3: Motherboard dimensions.

6. Operating Instructions

1. Power On:
   • After ensuring all connections are correct and secure, apply power to the controller. The digital display should light up, showing the current speed percentage (initially 000 if the potentiometer is at minimum).
2. Adjusting Speed:
   • Rotate the potentiometer knob clockwise to increase motor speed. The digital display will show the speed percentage from 0% to 100%.
   • Rotate the potentiometer knob counter-clockwise to decrease motor speed.
3. Changing Direction:
   • Use the connected forward/reverse switch to change the direction of the motor's rotation. Flip the switch to toggle between forward and reverse.
4. Power Off:
   • To turn off the motor and controller, turn the potentiometer knob fully counter-clockwise to 0% speed, then disconnect the main power supply.

7. Maintenance

• Cleaning: Keep the controller board clean and free from dust and debris. Use a soft, dry brush or compressed air to gently clean the components. Do not use liquids.
• Inspection: Periodically inspect all wiring connections for tightness and signs of wear or damage. Ensure heatsinks are clear of obstructions for proper cooling.
• Storage: When not in use for extended periods, store the controller in a dry, cool environment, away from direct sunlight and corrosive substances.

8. Troubleshooting

• No Power/Display Off:
  • Check the power supply connection and ensure it is providing the correct DC voltage.
  • Verify the polarity of the input power.
  • Inspect the digital display's 4-pin connector for proper seating.
• Motor Not Running:
  • Ensure the power supply is on and the digital display shows a speed percentage greater than 0.
  • Check motor wiring connections for tightness and correct polarity.
  • Verify the motor itself is functional.
• Incorrect Motor Direction:
  • Use the forward/reverse switch to change direction.
  • If the switch doesn't work, check its 2-pin connection.
  • Alternatively, swap the motor's positive and negative leads.
• Unstable Speed Control:
  • Check the potentiometer's 3-pin connection.
  • Ensure the potentiometer knob is clean and moves smoothly.

9. User Tips

• For optimal performance, ensure your power supply can deliver sufficient current for your motor at its maximum load.
• Consider adding an inline fuse on the power input line for additional protection against overcurrent.
• When testing, start with the speed potentiometer at its minimum setting (0%) and gradually increase the speed.
• If using the controller in an enclosure, ensure adequate ventilation to prevent overheating, especially under high load conditions.

10. Warranty and Support

This product is covered by the standard manufacturer's warranty against defects in materials and workmanship. For technical support or warranty claims, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.