1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of your WVCLTVJA 36V/48V 500W 25A E-Bike Sine Wave Brushless Motor Controller and S866 Colour Display Set. Please read this manual thoroughly before use to ensure safe and efficient operation of your electric bicycle or scooter system.
2. Safety Information
- Always disconnect the battery before performing any installation, maintenance, or repair work.
- Ensure all connections are secure and correctly wired according to the provided diagrams. Incorrect wiring can cause damage to the controller, motor, battery, or display.
- Avoid exposing the controller and display to water, excessive moisture, or extreme temperatures.
- Do not attempt to open or modify the controller or display. This will void the warranty and may lead to malfunction or injury.
- If you are unsure about any installation steps, consult a qualified technician.
- Use only with compatible 36V or 48V battery systems and 500W brushless motors.
3. Package Contents
Verify that all items are present and undamaged upon opening the package:
- 1 x 36V/48V 500W 25A Sine Wave Brushless Motor Controller
- 1 x S866 Colour Display
4. Product Overview
The WVCLTVJA controller and S866 display set are designed to provide efficient and reliable control for your e-bike or electric scooter. The sine wave controller ensures smooth motor operation, while the S866 display offers clear real-time information.

Image 4.1: WVCLTVJA 36V/48V 500W 25A E-Bike Sine Wave Brushless Motor Controller and S866 Colour Display Set. This image shows both the controller unit and the S866 display unit, connected by wires.
4.1. Controller Features
- Sine wave control for smooth and quiet motor operation.
- Supports 36V and 48V battery systems.
- Rated for 500W motors with a maximum current of 25A.
- Designed for brushless motors.

Image 4.2: WVCLTVJA E-Bike Controller with various wiring harnesses. This image highlights the controller unit and its multiple color-coded wire connectors for different components.
4.2. S866 Colour Display Features
- Colour LCD screen for clear visibility.
- Displays real-time speed (KM/H or MPH).
- Battery level indicator.
- Power Assist System (PAS) level indication.
- Odometer (ODO) and Trip distance.
- Power on/off button and mode selection buttons.

Image 4.3: S866 Colour Display showing speed, battery, and odometer. This image provides a close-up view of the S866 display interface, illustrating its various data readouts and control buttons.
5. Setup and Installation
Installation of the controller and display requires basic electrical knowledge. If you are not confident in your abilities, seek professional assistance.
5.1. General Wiring Guide
The controller features multiple color-coded connectors. Ensure each connector is matched to its corresponding component. Common connections include:
- Battery Connector: Connects to your 36V or 48V battery. Ensure correct polarity (red for positive, black for negative).
- Motor Connector: Connects to the motor's phase wires (usually three thick wires) and Hall sensor wires (usually five thin wires).
- Display Connector: Connects to the S866 display unit.
- Throttle Connector: Connects to the throttle unit.
- PAS Sensor Connector: Connects to the pedal assist sensor.
- Brake Lever Connectors: Connects to brake levers with cut-off sensors.
- Light Connector (Optional): For connecting headlights or taillights if supported.
Note: Specific wire colors and connector types may vary. Always refer to the wiring diagram provided with your e-bike kit or consult a professional.
5.2. Mounting the Display
Mount the S866 display securely on your handlebar using the provided bracket. Position it for optimal visibility and easy access to buttons while riding.
6. Operating Instructions
6.1. Powering On/Off
- To Power On: Press and hold the power button (U symbol) on the S866 display for a few seconds until the screen illuminates.
- To Power Off: Press and hold the power button again until the display turns off.
6.2. Display Functions
Once powered on, the S866 display will show various parameters:
- Speed: Current riding speed (e.g., 30 KM/H).
- Battery Level: Graphical indicator showing remaining battery charge.
- PAS Level: Power Assist System level (e.g., 5). Use the + and - buttons to adjust the assist level. Higher numbers provide more motor assistance.
- Odometer (ODO): Total distance traveled.
- Trip Distance: Distance traveled during the current ride.
- Voltage (VOL): Current battery voltage.
6.3. Adjusting Settings
The S866 display may allow for basic settings adjustments (e.g., unit conversion KM/H to MPH, wheel size). Refer to the specific S866 display manual for detailed instructions on accessing and modifying these settings.
7. Maintenance
- Cleaning: Wipe the display and controller with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners.
- Connections: Periodically check all electrical connections to ensure they are secure and free from corrosion.
- Protection: Keep the controller and display dry. If riding in wet conditions, ensure they are adequately protected from water ingress.
- Storage: When not in use for extended periods, store the e-bike in a dry, temperate environment.
8. Troubleshooting
If you encounter issues, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Display does not power on. | Battery low or disconnected; loose display connection; faulty display. | Check battery charge and connection. Ensure display cable is securely plugged into the controller. |
| Motor not responding. | Loose motor connections; faulty throttle; brake cut-off engaged; controller issue. | Verify all motor and throttle connections. Check if brake levers are fully released. Inspect for error codes on the display. |
| Inconsistent power assist. | PAS sensor issue; incorrect PAS level setting. | Check PAS sensor alignment and connection. Adjust PAS level on the display. |
| Display shows error code. | Specific system fault. | Consult the S866 display manual for specific error code meanings and solutions. |
If problems persist after attempting these solutions, contact customer support or a qualified technician.
9. Specifications
| Feature | Specification |
|---|---|
| Brand | WVCLTVJA |
| Model | S866 (Display) |
| Battery Voltage | 36V / 48V (Auto-detect) |
| Motor Power | 500W |
| Max. Current | 25A |
| Motor Type | Brushless Motor |
| Controller Type | Sine Wave |
| Item Weight | 50 g (Controller) |
| Country of Origin | China |
10. Warranty and Support
For warranty information and technical support, please refer to the retailer or manufacturer's official website. Keep your purchase receipt as proof of purchase.
For further assistance, you may contact WVCLTVJA customer service through their official channels.