Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of your CFTGIW DC 36V/48V 1000W Brushless Motor Controller with S866 LCD Display. This system is designed to provide stable speed control and sensitive management of braking and direction changes for electric riding applications, typically suitable for 1000W motors in electric bicycles or scooters. The controller features a robust metal shell for heat dissipation, and the S866 LCD display offers clear status and data visualization.
Setup and Installation
Careful installation is crucial for the proper function and longevity of your motor controller system. Ensure all connections are secure and correctly matched before applying power.
Component Overview

Image: The CFTGIW DC 36V/48V 1000W Brushless Motor Controller (silver box with multiple wires) and the S866 LCD Display (black unit with a screen and buttons) are shown together. The controller has various colored wires extending from one end, each with a specific connector.
Wiring Instructions
Identify each wire according to its color and connector type. Connect them to the corresponding components on your electric vehicle. Refer to the diagram below for visual guidance.

Image: A close-up view of the CFTGIW motor controller showing the various colored wires and their connectors. This image highlights the complexity of the wiring harness, which includes connections for the motor, power, display, brakes, throttle, and power sensor.
- Yellow, Green, Blue Single Big Head Wire: Connect these to the Motor Wires.
- Red-white-black-blue-green-yellow Double Row Six-wire Port: Connect these to the Motor Wire Hall Sensor.
- Red and Black Single Big Head Line: Connect these to the Power Line (Battery).
- Red, Blue, Black, Green and Yellow Single-row Five-wire Port: Connect these to the Instrument Line (S866 LCD Display).
- Black and Yellow Lines (two): Connect these to the Power-off Brake Handle Line.
- Red and Black Lines: Connect these to the Throttle Dial Line.
- Brown-black-yellow Line: Connect these to the Power Sensor Line.
- Black and Red Lines (two): Connect these to the Headlight Lines (if applicable).
Ensure all connections are firm and insulated to prevent short circuits. After wiring, secure the controller in a location that allows for adequate airflow for heat dissipation and protects it from physical damage and moisture.
Operating Instructions
The S866 LCD Display provides essential information and allows for various control settings. Familiarize yourself with its functions for optimal use.

Image: A close-up of the S866 LCD Display, showing a digital speed reading (44 km/h), battery level indicator, and assist level (5). The display also features 'plus', 'minus', and power buttons, along with a 'TRIP' button.
S866 LCD Display Functions
- Display Function: Shows current speed, battery level, assist level, and trip distance.
- Power Switch Control: Use the power button on the display to turn the system on or off.
- Wheel Diameter Setting: Allows calibration of speed and distance readings based on your wheel size.
- Idle Speed Automatic Sleep Time Setting: Configures the time after which the display will automatically enter sleep mode when idle.
- Backlight Brightness Setting: Adjusts the brightness of the LCD backlight for visibility in various lighting conditions.
- Startup Mode Setting: Configures how the motor assists upon startup (e.g., pedal assist level).
- Drive Mode Setting: Selects different riding modes or power levels.
- Voltage Level Setting: Ensures the display accurately reflects the battery voltage (DC 24V, 36V, 48V, 60V compatible).
- Controller Limit Value Setting: Adjusts parameters such as current limits for the motor controller.
Refer to the specific instructions provided with your S866 LCD display for detailed steps on accessing and modifying these settings.
Maintenance
Regular maintenance helps ensure the longevity and reliable performance of your motor controller system.
- Cleaning: Keep the controller and display clean and free from dust and debris. Use a soft, dry cloth. Avoid using harsh chemicals or excessive moisture.
- Connection Checks: Periodically inspect all wiring connections to ensure they are secure and free from corrosion or damage. Loose connections can lead to intermittent operation or component failure.
- Environmental Protection: While the display is rainproof, avoid prolonged exposure to heavy rain or submersion. Ensure the controller is mounted in a location protected from direct water spray and excessive heat.
- Heat Dissipation: The controller's metal shell is designed for heat dissipation. Ensure that its fins are not obstructed to allow proper airflow.
Troubleshooting
If you encounter issues with your motor controller system, consider the following common troubleshooting steps:
- No Power to Display/Motor:
- Check the main power connection from the battery to the controller.
- Ensure the display's power button is pressed.
- Verify battery charge level.
- Motor Not Responding:
- Check all motor phase wire connections (Yellow, Green, Blue).
- Verify the motor Hall sensor connections (Red-white-black-blue-green-yellow double row port).
- Inspect the throttle connection.
- Ensure no brake levers are engaged, as some systems have a power-off brake function.
- Incorrect Speed/Distance Reading:
- Check the wheel diameter setting in the S866 LCD Display.
- Display Error Codes:
- Refer to the S866 LCD Display manual for specific error code interpretations and solutions.
If problems persist after performing these checks, it is recommended to consult a qualified technician or contact customer support.
Specifications
| Feature | Specification |
|---|---|
| Brand | CFTGIW |
| Model | CFTGIWk9qbi1zwyn |
| Controller Rated Voltage | DC 36V/48V |
| Controller Maximum Current | 30A |
| Controller Speed Setting | 1-4.2V |
| Controller Brake Input | Low Level |
| Applicable Motor Power | 1000W |
| Controller Box Size | Approx. 149x84x42mm (5.9x3.3x1.7in) |
| Meter Size (S866 LCD) | Approx. 81x48mm (3.2x1.9in) |
| Meter Working Voltage | DC 24V, 36V, 48V, 60V Compatible |
| Item Weight | Approx. 1.46 pounds (0.66 kg) |
| Package Dimensions | Approx. 8.27 x 5.51 x 4.33 inches |
| Material | Aluminum Alloy (Controller), ABS Plastic (Display) |
Warranty Information
Specific warranty details for the CFTGIW DC 36V/48V 1000W Brushless Motor Controller with S866 LCD Display are not provided in the available product information. Please refer to your purchase documentation or contact the seller directly for warranty terms and conditions.
Customer Support
For technical assistance, further inquiries, or to report issues not covered in this manual, please contact the CFTGIW customer support through the retailer where the product was purchased. You may also visit the CFTGIW Store on Amazon for additional product information or contact options.