E-bike Accessory KD21C

E-bike LED Display User Manual

Model: KD21C

Brand: E-bike Accessory

1. Introduction

This manual provides detailed instructions for the installation, operation, and maintenance of your E300 E100 (KD21C) LED Display for electric bikes. This intelligent digital computer panel functions as a speedometer and provides essential information for your e-bike experience. Please read this manual thoroughly before use to ensure proper function and safety.

Diagram showing various applicable scenes for e-bike use including take-out, cycling, generation of driving, and fitness.
Figure 1: Applicable scenes for E-bike use.

2. Safety Information

  • Warning: Please mind potential fire risk and strictly follow the instruction manual for charging and storage of your e-bike battery and related components.
  • Ensure the display is securely mounted to prevent detachment during riding.
  • Avoid exposing the display to extreme weather conditions (heavy rain, direct sunlight for prolonged periods) to prevent damage.
  • Do not attempt to open or modify the display unit. This may void the warranty and cause damage.
  • Keep the display clean and dry. Use a soft, damp cloth for cleaning; avoid abrasive cleaners or solvents.
  • Professional installation is recommended for all electrical components of your e-bike.

3. Product Features

The KD21C LED Display offers essential functionalities for your electric bicycle:

  • LED Display: Clear visual indication of key riding parameters.
  • Digital Intelligent Computer Panel: Provides smart control and monitoring.
  • Speedometer Function: Displays current speed.
  • Battery Level Indicator: Shows battery status from EMPTY to FULL.
  • Speed Mode Selection: Allows selection between LOW, MED, and HIGH assist levels.
  • ON/OFF Button: For powering the e-bike system.
  • 5PIN Connector: Standard interface for e-bike systems.
Close-up of the E-bike LED display interface, showing battery level indicators (EMPTY to FULL) and speed mode indicators (LOW, MED, HIGH) along with ON/OFF and +/- buttons.
Figure 2: Display interface with indicators and controls.

4. Specifications

Parameter Value
Model KD21C
Type Display
Power Supply 24V/36V/48V
Rated Working Current 10mA
Maximum Working Current 30mA
Off-state Leakage Current <1μA
Working Temperature -20℃ ~ 60℃
Storage Temperature -30℃ ~ 70℃
Connector Type 5PIN
Origin Mainland China

5. Setup and Installation

Before installation, ensure your e-bike's power is turned off and the battery is disconnected.

  1. Mounting the Display:
    • Identify a suitable location on your e-bike's handlebars, typically near the left grip, that allows for easy viewing and access to buttons.
    • Loosen the screws on the display's mounting bracket.
    • Position the display on the handlebar and tighten the screws securely, ensuring the display is stable and does not rotate freely.
    Rear view of the E-bike LED display, showing the handlebar mounting bracket and cable exit point.
    Figure 3: Display with mounting bracket.
  2. Connecting the Cable:
    • Locate the 5PIN connector cable extending from the display unit.
    • Connect this cable to the corresponding 5PIN port on your e-bike's controller or wiring harness. Ensure the connection is firm and correctly aligned to prevent damage to the pins.
    • Route the cable neatly along the frame, securing it with cable ties if necessary, to prevent it from interfering with moving parts or getting snagged.
    Front view of the E-bike LED display with its integrated 5PIN connector cable.
    Figure 4: 5PIN connector detail.
  3. Initial Power-Up:
    • Once the display is securely mounted and connected, reconnect your e-bike's battery.
    • Press the red ON/OFF button on the display to power on the system.
    • The display should light up, indicating successful installation.

Important Note: This product is described as a "customized product." It is crucial to contact the seller immediately after placing your order to provide any necessary information for customization and to receive specific instructions or compatibility details relevant to your e-bike system. Failure to do so may result in compatibility issues or incorrect functionality.

6. Operating Instructions

The KD21C LED Display provides intuitive control over your e-bike's basic functions.

Side view of the E-bike LED display, clearly showing the red ON/OFF button and the white plus (+) and minus (-) buttons.
Figure 5: Display controls.
  1. Power ON/OFF:
    • Press the red ON/OFF button to turn the e-bike system on.
    • Press and hold the ON/OFF button for a few seconds to turn the system off.
  2. Battery Level Indicator:
    • The display features a series of LED lights ranging from "EMPTY" to "FULL" to indicate the current battery charge level.
    • Monitor this indicator to plan your rides and avoid running out of power unexpectedly.
  3. Adjusting Speed Modes (Assist Levels):
    • Use the + (plus) button to increase the assist level (e.g., from LOW to MED, or MED to HIGH).
    • Use the - (minus) button to decrease the assist level (e.g., from HIGH to MED, or MED to LOW).
    • The selected assist level (LOW, MED, HIGH) will be indicated by the corresponding LED on the display.
  4. Speedometer:
    • The display will show your current riding speed. The exact format (digital number or indicator lights) depends on the specific customization of your KD21C model.

7. Maintenance

Proper maintenance ensures the longevity and optimal performance of your LED display.

  • Cleaning: Regularly wipe the display screen and casing with a soft, slightly damp cloth. Do not use harsh chemicals, abrasive cleaners, or excessive water, as these can damage the electronics or screen.
  • Connection Check: Periodically inspect the 5PIN connector and cable for any signs of wear, corrosion, or loose connections. Ensure it remains securely plugged in.
  • Environmental Protection: While designed for outdoor use, avoid prolonged exposure to extreme temperatures, heavy rain, or direct sunlight when the e-bike is not in use. Store your e-bike in a dry, sheltered area.
  • Impact Avoidance: Protect the display from physical impacts or drops, which can cause internal damage or screen cracks.

8. Troubleshooting

If you encounter issues with your KD21C LED Display, refer to the following common troubleshooting steps:

Problem Possible Cause Solution
Display does not turn on. No power from battery; loose connection; faulty display.
  • Ensure e-bike battery is charged and connected.
  • Check the 5PIN connector for a secure and correct connection.
  • If issues persist, contact seller for support.
Incorrect speed reading or no speed displayed. Speed sensor issue; loose wiring; display malfunction.
  • Verify the speed sensor on your e-bike is clean and properly aligned.
  • Check all wiring connections related to the display and controller.
  • If the problem continues, seek professional assistance.
Buttons are unresponsive. Dirt/debris; internal fault.
  • Ensure buttons are free from dirt or obstructions.
  • If unresponsive, power cycle the e-bike.
  • If still problematic, contact the seller for further diagnosis.
Battery indicator is inaccurate. Battery calibration issue; aging battery; display fault.
  • Fully charge and discharge your e-bike battery a few times to recalibrate.
  • If the battery is old, its capacity may have degraded.
  • Consult with the seller if the issue persists.

9. User Tips

  • Customization Details: As this is a customized product, always communicate your e-bike's specific voltage (24V, 36V, or 48V) and any other relevant system details to the seller upon purchase to ensure optimal compatibility and performance.
  • Battery Management: Pay close attention to the battery level indicator, especially on longer rides, to avoid unexpected power loss.
  • Assist Level Usage: Experiment with the LOW, MED, and HIGH assist levels to find the most comfortable and efficient setting for different terrains and riding conditions.
  • Regular Checks: Before each ride, quickly check that the display powers on, shows correct information, and that buttons are responsive.

10. Warranty and Support

Your KD21C LED Display is backed by the following support and return policies:

  • Free Returns: Enjoy free returns within 90 days of receiving your product.
  • Delivery Guarantee:
    • Receive a $1.00 coupon code if delivery is delayed.
    • Full refund if the package is lost in transit.
    • Full refund if items are damaged upon arrival.
    • Full refund if no delivery within 30 days.
  • Product Defects: If you return the goods within 15 days after receiving them due to product defects, damage, or any fault of the seller (not personal preference or misuse), your payment will be refunded. Returned items must remain in the same condition as received.
  • Contacting Support: For any questions, technical assistance, or warranty claims, please contact the seller directly through the platform where you made your purchase. Provide your order number and, if applicable, images or videos of any defective products to expedite the support process.

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