1. Introduction
This manual provides detailed instructions for the BOJACK DC Mini Motor PWM Speed Controller (Model BJ-MSC-LED). This device is designed to precisely control the speed of DC motors and adjust the brightness of LEDs using Pulse Width Modulation (PWM) technology. It is suitable for a wide range of low-voltage DC applications.
2. Safety Information
Please read and understand all safety instructions before installation and operation to prevent injury or damage to the device and connected equipment.
- Voltage Compatibility: Ensure your power supply and connected motor/LED operate within the specified voltage range of DC 3V-35V. Exceeding this range can damage the controller.
- Current Limits: Do not exceed the maximum current rating of 5A. Overcurrent can trigger the resettable fuse or damage the device.
- Polarity: Always observe correct polarity for DC input and motor/LED connections. Incorrect polarity can cause immediate damage.
- Resettable Fuse: The controller features a high voltage and high current resettable fuse. In case of an overcurrent event, the fuse will automatically disconnect. Allow a few seconds for cooling, and the fuse will automatically recover.
- Wiring: Ensure all connections are secure and insulated to prevent short circuits.
- Environment: Operate the device in a dry environment, away from moisture, dust, and extreme temperatures.
3. Product Overview
The BOJACK DC Mini Motor PWM Speed Controller is a compact unit designed for ease of use and integration. It features a potentiometer for variable control and clearly labeled terminals for power input and motor/LED output.
Figure 3.1: Front View of the Controller. This image shows the top side of the controller, featuring the black control knob, blue screw terminals for connections, and various electronic components mounted on the red circuit board.
Figure 3.2: Back View of the Controller. This image displays the underside of the controller, clearly indicating the 'DC IN' and 'MOTOR' connection points with their respective positive (+) and negative (-) terminals for proper wiring.
4. Specifications
| Feature | Specification |
|---|---|
| Operating Voltage | DC 3V-35V |
| PWM Duty Cycle | 1% - 100% |
| PWM Frequency | 10 kHz |
| Control Power (Max) | 90W |
| Quiescent Current (Standby) | 0.015A |
| Max Current | 5A |
| Dimensions (L x W x H) | 1.77" x 0.95" x 0.78" (45mm x 24mm x 20mm) |
| Model Number | BJ-MSC-LED |
| Material | Copper (internal components) |
5. Setup and Wiring
Follow these steps to correctly connect the PWM speed controller:
- Identify Terminals: Locate the 'DC IN' terminals for power input and 'MOTOR' terminals for connecting your DC motor or LED. Refer to Figure 3.2 for terminal identification.
- Connect Power Input: Connect your DC power supply to the 'DC IN' terminals. Ensure the positive (+) terminal of the power supply connects to the '+' terminal of 'DC IN', and the negative (-) terminal of the power supply connects to the '-' terminal of 'DC IN'.
- Connect Load: Connect your DC motor or LED to the 'MOTOR' terminals. Ensure the positive (+) terminal of the motor/LED connects to the '+' terminal of 'MOTOR', and the negative (-) terminal of the motor/LED connects to the '-' terminal of 'MOTOR'.
- Low Voltage Input (3V-9V): If your input voltage is between 3V and 9V, a short circuit connection is required. The product is shipped with the short circuit point disconnected by default. Manually connect the short circuit point according to your specific needs for operation within this voltage range. Consult the product diagram for the exact location of the short circuit point.
- Grounding Consideration: Note that this controller primarily modulates the negative ground side. If the device you are controlling has its own independent ground (negative) connection that is separate from the power supply's ground, it may not function as expected or may operate at full power, bypassing the control. Ensure your load's negative connection is routed through the controller's 'MOTOR -' terminal for proper modulation.
After all connections are made, you can apply power to the circuit.
6. Operating Instructions
Once the controller is wired and powered, operate it as follows:
- Power On: Apply power to the 'DC IN' terminals.
- Adjust Control Knob: Rotate the black knob (potentiometer) clockwise to increase the speed of the connected DC motor or the brightness of the LED. Rotate it counter-clockwise to decrease speed or brightness.
- Off Position: The control knob typically includes an 'off' position at its minimum rotation, allowing you to completely turn off the connected device without disconnecting power.
- PWM Duty Cycle: The controller allows for a PWM duty cycle from 1% to 100%, providing fine-grained control over the output.
7. Maintenance
The BOJACK DC Mini Motor PWM Speed Controller requires minimal maintenance:
- Keep Clean: Periodically clean the device with a dry, soft cloth to remove dust and debris. Do not use liquid cleaners.
- Environmental Protection: Ensure the controller remains in a dry, well-ventilated area, free from corrosive gases and extreme temperatures.
- Connection Checks: Occasionally check all wiring connections to ensure they remain secure.
8. Troubleshooting
If you encounter issues with your controller, refer to the following troubleshooting guide:
- No Power/No Output:
- Check all power supply connections for correct polarity and secure contact.
- Verify that the power supply is providing the correct voltage (3V-35V DC).
- Ensure the control knob is not in the 'off' position.
- Check if the resettable fuse has tripped due to overcurrent. If so, disconnect power, allow a few seconds for cooling, and then reapply power.
- Motor/LED Runs at Full Speed, No Control:
- This controller modulates the negative ground. Ensure that the negative terminal of your motor or LED is connected directly to the 'MOTOR -' terminal of the controller, and not independently grounded to the power supply. If the load has an independent ground, the controller's modulation may be bypassed.
- Verify the control knob is functioning correctly.
- Intermittent Operation or Device Failure:
- Ensure the load (motor/LED) does not exceed the 5A current limit or 90W power limit.
- Check for loose connections or damaged wiring.
- Inspect the controller for any visible signs of damage or overheating.
- Low Voltage Input (3V-9V) Issues:
- Confirm that the short circuit point for low voltage input has been manually connected as required.
9. Warranty and Support
Specific warranty information for the BOJACK DC Mini Motor PWM Speed Controller (Model BJ-MSC-LED) is not provided in this manual. For warranty claims, technical support, or further assistance, please contact your retailer or the manufacturer directly through their official support channels.