Introduction
This manual provides essential information for the installation, operation, and maintenance of your VGEBY Motor Speed Brush Controller. This device is designed to provide stable speed control and responsive braking and direction changes for electric bicycles and scooters. Constructed from durable aluminum alloy, it offers circuit protection and efficient heat dissipation.
Safety Precautions
- Always ensure the power is disconnected before making any connections or adjustments.
- Verify all connections are correct according to the labels to prevent damage to the controller or other components.
- Pay close attention to the polarity of the power cord: red for positive (+), black for negative (-). Incorrect polarity can cause severe damage.
- If you are unsure about any step, consult a qualified technician.
Setup and Installation
The controller features clearly labeled interfaces to facilitate easy installation. Carefully read the labels on each interface and connect them to their corresponding components.
- Identify Interfaces: Locate the instruction labels on each connector. These labels indicate the function of each wire (e.g., battery, motor, throttle, brake, indicator light, charging port, power locks).
- Power Connection: Connect the thick red wire to the positive terminal of your battery and the thick black wire to the negative terminal. Double-check polarity before applying power.
- Motor Connection: Connect the motor wires to the corresponding motor output wires from the controller.
- Throttle Connection: Connect the throttle assembly to the designated throttle interface. The speed regulator typically operates within a 1-4V range.
- Brake Connections: Connect the brake levers to the brake interfaces. The controller is designed for sensitive control of braking.
- Accessory Connections: Connect any additional accessories such as indicator lights, charging ports, or power locks to their respective labeled interfaces.

Figure 1: VGEBY Motor Speed Brush Controller showing the main unit and its various labeled wire connectors for different functions.

Figure 2: Close-up view of the controller's wire harnesses, highlighting a connector labeled 'Indicator' in Chinese and English, demonstrating the clear labeling for installation.

Figure 3: Top view of the VGEBY controller, displaying a label with model number LB27, rated voltage DC24V, rated power 250W, current, undervoltage protection, and speed regulator range.
Operating Instructions
Once properly installed, the controller manages the power delivery to the motor, enabling smooth acceleration and responsive braking. The throttle provides variable speed control, typically within a 1-4V range, allowing for precise adjustment of motor speed.
- Power On: Ensure all connections are secure and the battery is charged. Turn on the main power switch of your electric bike or scooter.
- Throttle Control: Gently twist the throttle to initiate movement. The controller will provide steady speed based on the throttle input.
- Braking: Apply the brakes as needed. The controller is designed to provide sensitive and immediate braking response.
Video 1: An overview of a motor speed brush controller, demonstrating its physical appearance and various wire connections. This video helps visualize the component for installation and understanding its function.
Maintenance
The VGEBY Motor Speed Brush Controller is designed for durability with its aluminum alloy casing, which aids in heat dissipation. Regular maintenance is minimal but important for longevity.
- Keep Clean: Periodically clean the exterior of the controller to prevent dust and debris buildup, which can hinder heat dissipation.
- Inspect Connections: Regularly check all wire connections to ensure they are secure and free from corrosion or damage. Loose connections can lead to intermittent operation or component failure.
- Avoid Overheating: Ensure the controller is mounted in a location with adequate airflow to prevent thermal overloading. The aluminum alloy casing helps, but proper ventilation is still crucial.
- Protect from Moisture: While robust, avoid exposing the controller to excessive moisture or direct water spray to prevent internal circuit damage.
Troubleshooting
If you encounter issues with your VGEBY Motor Speed Brush Controller, refer to the following common problems and solutions:
- Controller Not Functioning / No Power:
- Check all power connections, especially the thick red and black battery wires, for correct polarity and secure attachment.
- Ensure the battery is charged and providing the correct voltage (24V, 36V, or 48V depending on model).
- Verify that any "ignition" or "power lock" wires are correctly connected or bridged if required by your system.
- Motor Not Responding to Throttle:
- Inspect the throttle connection for proper seating and damage.
- Confirm the motor wires are securely connected to the controller.
- Check if the throttle provides a variable voltage output (typically 1-4V) when twisted.
- Intermittent Operation or Sudden Shutdown:
- This could indicate loose connections. Re-check all wire connections.
- The controller might be overheating. Ensure adequate ventilation and that the motor load is within the controller's specified limits.
- Check for short circuits in the wiring or motor.
- Throttle is "ON/OFF" instead of Gradual:
- This symptom suggests an issue with the throttle unit itself or its connection. Ensure you are using a compatible variable throttle.
- Verify the throttle signal wire is correctly connected to the controller's throttle input.
If these steps do not resolve the issue, contact customer support for further assistance.
Specifications
| Feature | Detail |
|---|---|
| Material | Aluminum alloy |
| Rated Voltage Options | 24V; 36V; 48V |
| Under-Voltage Protection | 20±0.5V (for 24V); 31.5±0.5V (for 36V); 42±0.5V (for 48V) |
| Speed Regulator | 1-4V |
| Compatible Motor Power | 250W, 350W, 500W (specific models vary by controller version) |
| Dimensions (Approx.) | 75 x 50 x 35mm (for 250W/350W models); 83 x 65 x 37mm (for 500W models) |
| Weight (Approx.) | 120-190g |
| Application | Electric bicycles and scooters |
| Model Number | BFXXXAU-AMA-TJA02753 |
| Country of Origin | China |

Figure 4: The VGEBY controller with its approximate dimensions (75mm x 50mm x 35mm) clearly indicated, providing a visual reference for size.
Video 2: A demonstration of a motor controller, highlighting its features and potential applications in electric bicycles. This video provides a visual aid for understanding the product's functionality and design.
Warranty and Support
This product comes with a 180-day guarantee. If you encounter any issues or problems with the product within this period, please contact the seller for assistance.
For support, please contact the seller, Linfote, through the platform where the purchase was made. They can provide guidance on installation, troubleshooting, and warranty claims.
For general inquiries or to visit the brand's store, you can find more information at the VGEBY Store.