1. Product Overview
This HANGKAI 36v/48v 1200w Electric Bike Controller kit is designed to convert standard bicycles into electric bicycles, offering a smoother and more efficient riding experience. It includes a FOC Sine Wave Controller for quiet operation, an LCD meter for real-time data display, and a pedal assistant sensor for enhanced riding comfort.
The kit provides stable speed control and sensitive braking capabilities, making your electric bike conversion reliable and enjoyable.

Image 1.1: Complete kit components, including the controller, LCD meter, thumb throttle, pedal assist sensor, and handlebar grips.
2. Components Included
- 1x Brushless FOC Sine Wave Controller
- 1x Color Screen LCD Meter with Bracket
- 1x Thumb Throttle
- 1x Pedal Assistant Sensor
- Other necessary accessories for assembly (e.g., turnbuckle cover)
3. Setup and Installation
Proper installation is crucial for the correct functioning of the electric bike controller kit. Ensure all connections are solid and secure. Incorrect installation may prevent the product from operating as intended.
3.1 Wiring Connections
Carefully identify each wire and connect it to its corresponding component. Ensure that the inner core of each plug is not damaged, broken, or bent before making connections.
- Red Wire: Power Input (Connect to battery positive)
- Yellow Wire: Power Output (Connect to motor power)
- Blue Wire: Signal Transmission
- Green Wire: Signal Reception
- Black Wire: Power Negative (Connect to battery negative)

Image 3.1: The controller's wiring harness, showing various color-coded cables for different functions.
3.2 LCD Meter Installation
Mount the LCD meter onto your handlebar using the provided bracket. The bracket is suitable for 31.8mm handlebars and can be adapted for 21mm, 22mm, 23mm, or 24mm handlebars using a rubber ring (not included, if required). Ensure the meter is positioned for easy viewing during your ride.

Image 3.2: The LCD meter unit with its cable and integrated control buttons.
3.3 Pedal Assistant Sensor Installation
Install the pedal assistant sensor according to your bicycle's crankset configuration. This sensor detects your pedaling rhythm and adjusts the motor's speed accordingly, providing assistance during your ride.
3.4 Thumb Throttle Installation
Attach the thumb throttle to your handlebar in a comfortable and accessible position. This component provides stable and sensitive speed control for the electric motor.

Image 3.3: The thumb throttle for controlling motor speed.
4. Operating Instructions
4.1 LCD Meter Display
The LCD instrument display provides comprehensive real-time information about your ride. The backlight ensures visibility in various lighting conditions.
- Real-time Speed: Current riding speed.
- Maximum Speed: Highest speed achieved during the current trip.
- Average Speed: Average speed for the current trip.
- Total Mileage: Cumulative distance traveled.
- Single Mileage: Distance traveled in the current trip.
- Battery Power Display: Current battery charge level.
- Assist Gear/Speed Grading: Current level of pedal assistance.
- Cruise Control: Indicates if cruise control is active.

Image 4.1: The LCD meter displaying various ride metrics such as speed, battery voltage, temperature, motor power, distance, and time.
4.2 Pedal Assist System (PAS)
The pedal assistant sensor automatically engages the motor to provide assistance as you pedal. You can typically adjust the level of assistance through the LCD meter controls.
4.3 Thumb Throttle Operation
Use the thumb throttle to manually control the motor's speed. Apply gentle pressure for gradual acceleration and release to decelerate. Always operate the throttle responsibly and safely.
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your electric bike controller kit.
- Check Connections: Periodically inspect all electrical connections, including those to the motor, battery, and sensors, to ensure they remain solid and free from damage.
- Clean Components: Keep the controller, LCD meter, and sensors clean and free from dirt, dust, and moisture. Use a soft, dry cloth for cleaning.
- Inspect Wiring: Regularly check all wiring for any signs of wear, fraying, or damage. Replace any compromised wires immediately to prevent electrical issues.
- Avoid Water Exposure: While components may have some water resistance, avoid prolonged exposure to heavy rain or submersion in water.
6. Troubleshooting
If you encounter issues with your electric bike controller, refer to the following common problems and solutions:
- No Power to System:
- Check battery charge level.
- Verify all power input and output connections (Red and Black wires) are secure.
- Ensure the battery is properly connected and switched on.
- Motor Not Responding:
- Check motor connections to the controller (Yellow wire).
- Ensure the thumb throttle is correctly installed and functioning.
- Verify the pedal assistant sensor is correctly installed and aligned.
- Incorrect Display Readings:
- Ensure the LCD meter cable is securely connected to the controller.
- Check for any damage to the LCD meter or its cable.
- Note that speed readings are influenced by wheel size, road conditions, battery status, and load.
- System Not Working After Installation:
- Re-check all wiring connections against the diagram in Section 3.1. A single incorrect connection can prevent operation.
- Ensure no inner core of any plug is damaged or bent.
7. Specifications
| Feature | Specification |
|---|---|
| Model | NC3630 |
| Material | Aluminium Alloy |
| Voltage | DC 36V / 48V |
| Matchable Motor Power | 750W - 1200W |
| Current | 30 ± 1A |
| Meter Type | LCD Instrument |
| Controller Size (L*W*H) | 212 x 115 x 55 mm (8.3 x 4.5 x 2 inches) |
| LCD Meter Size (L*W) | 68 x 96 mm (2.6 x 3.7 inches) |
| Suitable Handlebar Diameter | 21mm, 22mm, 23mm, 24mm, 31.8mm |
| Net Weight | 0.9 kg (1.9 lbs) |
| Gross Weight | 1 kg (2.2 lbs) |

Image 7.1: Dimensions of the HANGKAI electric bike controller.
8. Warranty Information
This product comes with a limited warranty. For specific details regarding the warranty period, coverage, and claims process, please refer to the purchase documentation or contact the seller directly.
9. Customer Support
If you have any questions, require technical assistance, or need further support regarding your HANGKAI 36v/48v 1200w Electric Bike Controller, please contact the seller or manufacturer through the platform where the product was purchased. Provide your product model and purchase details for efficient assistance.