Dilwe S866
S866 LCD Instrument and Controller Kit User Manual
Model: S866 | Brand: Dilwe
1. Product Overview
The Dilwe S866 LCD Instrument and Controller Kit is designed for converting lithium battery-powered bicycles or scooters into electric riding vehicles. It is typically suitable for 1000W motors and operates with DC 36V/48V systems. The kit includes a robust controller and an intuitive LCD display, providing essential information and control over your electric vehicle's performance.
Key Features:
- Rainproof LCD backlight display for clear visibility of status and data.
- Controller shell made of metal with a groove design for good heat dissipation, protecting internal circuits from thermal overload.
- Provides stable speed and sensitive control for braking and direction changes.
- Comprehensive control settings including power switch, wheel diameter, idle speed sleep time, backlight brightness, startup mode, drive mode, voltage level, and controller limit value.

Figure 1: The S866 LCD Instrument and Controller Kit, featuring the main controller unit and the S866 LCD display.
2. Components and Wiring
The kit consists of the main controller unit and the S866 LCD display. Proper wiring is crucial for the correct function of the system. The controller features various color-coded wires for different connections.
2.1 Controller Wire Color Definition:
- Yellow, Green, Blue Single Big Head Wire: Motor Wire
- Red-white-black-blue-green-yellow Double Row Six-wire Port: Motor Wire
- Red and Black Single Big Head Line: Power Line
- Red, Blue, Black, Green and Yellow Single-row Five-wire Port: Instrument Line
- Black and Yellow Lines (two): Power off Brake Handle Line
- Red and Black Lines: Throttle Dial Line
- Brown-black-yellow Line: Power Sensor Line
- Black and Red Lines (two): Headlight Lines
2.2 Wiring Diagram:

Figure 2: Comprehensive wiring diagram illustrating connections for the motor, display, throttle, brake, power assist sensor, battery, and lights.
Installation Tip: Connect the controller to the corresponding line interfaces as per the diagram to ensure proper functionality. Ensure all connections are secure before powering on the system.
3. Operating Instructions
The S866 LCD display provides real-time data and allows for various system adjustments. The meter is compatible with DC 24V, 36V, 48V, and 60V systems (voltage selection setting available on the meter).
3.1 Display Functions:
- Speed Display: Shows current speed (Avg: Average Speed, Max: Maximum Speed, Speed: Current Speed) in Mp/h or Km/h. The speed signal is derived from the motor's Hall signal.
- Battery Indicator: Displays battery power and remaining power.
- Fault Indicator: Alerts to system errors.
- Mileage: Shows total mileage (ODO) and single trip mileage (TRIP).
- Single Boot Time: Displays the duration of the current ride.
- Battery Voltage (VOL): Shows the current battery voltage.
- DST: Battery life indication.
- Vehicle Power Gear Adjustment: 0-9 digital display and gear bar display.
3.2 Control Setting Functions:
- Power Switch Control
- Wheel Diameter Setting
- Idle Speed Automatic Sleep Time Setting
- Backlight Brightness Setting
- Startup Mode Setting
- Drive Mode Setting
- Voltage Level Setting
- Controller Limit Value Setting

Figure 3: The S866 LCD display mounted on a bicycle handlebar, providing a clear view of operational data.

Figure 4: A close-up of the S866 LCD display, highlighting its control buttons and screen interface.
3.3 Product Demonstration Video:
Video 1: A demonstration of the S866 LCD Instrument and Controller Kit, showcasing its components and basic functionality.
4. Maintenance
To ensure the longevity and optimal performance of your S866 LCD Instrument and Controller Kit, follow these general maintenance guidelines:
- Keep the controller and display clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Avoid exposing the components to extreme temperatures or direct sunlight for prolonged periods.
- Ensure all wiring connections remain secure. Periodically check for any loose or damaged wires.
- While the display is rainproof, avoid submerging the unit in water.
- Do not attempt to open the controller or display housing, as this may void any potential warranty and could damage internal components.
5. Troubleshooting
If you encounter issues with your S866 LCD Instrument and Controller Kit, refer to the following common troubleshooting steps:
5.1 Common Error Codes:
- Error 30: This error typically indicates a communication issue between the display and the controller.
5.2 Troubleshooting Steps:
- Check all connections: Ensure all wires are securely plugged into their respective ports on both the controller and the display. Loose connections are a common cause of communication errors.
- Verify power supply: Confirm that the battery is adequately charged and providing the correct voltage (36V/48V).
- Inspect for physical damage: Look for any visible damage to the wires, connectors, controller, or display.
- Reset the system: Turn off the power, wait a few seconds, and then turn it back on.
- Avoid changing Setting 20: Some users have reported issues after modifying 'Setting 20'. It is advised not to alter this setting as it may lead to communication problems or other malfunctions.
If the issue persists after attempting these steps, please contact customer support for further assistance.
6. Specifications
| Feature | Specification |
|---|---|
| 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 |
| Booster Ratio | 1:5 |
| Material | Aluminum Alloy + ABS Plastic |
| Weight | Approx. 714g / 25.2oz |
| Controller Box Size | Approx. 149x84x42mm / 5.9x3.3x1.7in |
| Meter Size | Approx. 81x48mm / 3.2x1.9in |
| Meter Working Voltage | DC 24V, 36V, 48V, 60V Compatible |
| Communication Protocol | UART |

Figure 5: Dimensions of the S866 Controller Box and LCD Display.
7. Warranty and Support
For any product-related inquiries, technical support, or warranty claims, please contact Dilwe customer service. Keep your purchase receipt as proof of purchase.
You can visit the official Dilwe store for more information and support: Dilwe Store on Amazon
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