Key-Disp KD718-X eBike Display User Manual

Product Name and Model

Name: Intelligent colored LCD display for E-bike

Model: KD718-X

Specifications

• Power Supply: 36V/48V
• Rated working current: 10mA
• Maximum working current: 30mA
• Off-state leakage current: <1μA
• Operating temperature: -20℃ ~ 60℃
• Storage temperature: -30℃ ~ 70℃

Appearance and Size

The display features an intelligent colored LCD screen designed for e-bikes. It includes a handlebar-mounted control unit. Dimensional drawings are provided for both the display unit and the remote control.

Display Unit Dimensions (unit: mm): Approximately 74.4mm in height and 49.96mm in width. The mounting bracket dimensions are also shown.

Remote Control Dimensions (unit: mm): The remote control unit is approximately 42mm in width. It features three buttons arranged in a circular pattern with directional indicators. Dimensional drawings show its shape and mounting mechanism.

On-Screen Display Example: A screenshot shows the display interface with 90% battery, 19:45 time, 682W power, 25.5 km/h speed, 'Sport' mode, ODO (1523 miles), and PAS level 3.

Function Summary

The KD718-X display offers a comprehensive set of functions to meet user needs, including:

• Intelligent Battery SOC (State of Charge) indication
• Motor Power indication
• Assist-level indication and selection
• Speed indication (real-time, maximum, and average speed)
• Odometer and trip distance tracking
• Push-assistance control and indication
• Trip time indication
• Backlight On/Off and indication
• Error code indication
• USB connection indicator
• Various Parameter Settings (e.g., wheel size, speed limit, battery voltage segmentation, power assist parameters)

General Operation

Switching the E-bike System On/Off

Briefly press the power button to switch on the E-bike system. To switch off, hold the power button for 2 seconds; the system will shut down and stop using battery power. The leakage current when off is less than 1 μA. The system also switches off automatically after 5 minutes of inactivity.

Display Interface

Upon switching on, the display shows real-time Speed and Trip Distance by default. Pressing the [info] button cycles through the following information:

• Trip (Km)
• ODO (Km)
• Max. Speed (Km/h)
• Avg. Speed (Km/h)
• Time (Min.)

A visual cycle interface demonstrates this transition between Trip, ODO, Max Speed, Avg Speed, and Time displays.

Specific Functions

Switching Push-assistance Mode On/Off

To activate push-assistance (walking mode), hold the [-] button for 2 seconds. The e-bike drive engages at a speed under 6 Km/h, indicated on the screen. Releasing the [-] button immediately stops the function and power output.

Note: This function is intended for pushing the e-bike. Be cautious of injury when the wheels have no ground contact.

A screenshot shows the display in push-assistance mode, indicating 5.5 km/h speed and 20.5 km trip distance.

Switching the Lighting On/Off

Hold the [+] button to turn on the bike light, which may also reduce backlight brightness. Holding the [+] button again turns the lighting off.

A screenshot illustrates the display interface related to lighting control.

Indicators

Assist Level Selection

Press the [+] or [-] button to cycle through assistance levels (0-5) to adjust motor output power. Level 0 provides no power, Level 1 is minimum, and Level 5 is maximum. Pressing [+] at Level 5 will keep it at 5 and blink to indicate maximum. Pressing [-] at Level 0 will keep it at 0 and blink to indicate minimum. The default level is 1.

An interface image shows the assist level toggling, displaying the current level (e.g., '1').

Battery SOC Indicator

The battery status is shown by five segments. All segments are bright when the battery voltage is high. When the percentage reaches 0%, the battery requires immediate recharging.

Visual examples show battery levels at 100%, 80%, 60%, 40%, 20%, and 0%.

Motor Power Indicator

The output power of the motor can be viewed on the display interface.

An interface image displays the motor power (e.g., 682W).

USB Connection Indication

When a USB external device is connected, the display interface will show a specific indication.

An interface image illustrates the USB connection status.

Error Code Indication

The e-bike system continuously monitors its components. If an error is detected, an error code is displayed in the text indication area. Detailed messages for error codes are provided in "Attached list 1".

An interface image shows an example error message: "Error Code: 30 Communication fault".

Note: If an error code appears, the display should be repaired by an authorized dealer to ensure normal bike operation.

Settings

To access the settings menu, press the On/Off [power] button to turn on the display on a stationary e-bike, then hold both the [+] and [-] buttons for 2 seconds.

All settings are operated when the e-bike is not moving.

The settings interface shows icons for Wheel (⚙️), Speed Limit (️), Unit (?), Password (?), Brightness (?), Voltage (?), Factory (?), Display (?️), Advanced (⚙️), Dormancy (⏰), and Exit (↩️).

Wheel Diameter Settings

This setting adjusts the wheel diameter. Use the [+] or [-] buttons to increase or decrease the value. The default is 26 inches. Press the [info] button to confirm.

Interface images show the selection process, leading to a display of "Wheel 26 inch".

Speed-limit Settings

This setting limits the e-bike's speed. If the current speed exceeds the set limit, the system reduces power output. The range is 15 Km/h to 40 Km/h, with a default of 25 Km/h. Use [+] or [-] to adjust and [info] to confirm.

Interface images demonstrate setting the speed limit, showing "Speed Limit 25 Km/h".

Backlight Brightness Settings

Adjusts the backlight brightness from Level 1 (lowest) to Level 5 (highest). Use [+] or [-] to choose the desired level and [info] to confirm.

Interface images show the brightness adjustment, indicating "Brightness 5".

Battery Power Bar Settings

This feature allows segmentation of battery voltage values for display. It supports 36V/48V systems. Five voltage values need to be entered sequentially for the 5 battery bars. For 48V, the default first bar value is 41.2V. Use [+] or [-] to adjust voltage and [info] to proceed to the next setting or confirm.

Interface images show the process of setting voltage values for each bar (e.g., -36V, 48V, and specific voltage ranges like 40.0V to 49.0V).

Advanced Settings

This section covers advanced parameters, including PAS (Power Assist System) settings.

The "Advanced Settings" interface displays options like Speed Sensor, Assistant Num, Power Set, Current Limit, Sensitivity, Slow Start, SOC V, and BACK.

Speed Sensor Settings

Sets the number of magnets for the speed sensor. The range is 1 to 15 magnets. The default is 1. Use [+] or [-] to adjust and [info] to confirm.

Interface images show the "Speed Sensor" setting being adjusted.

Power Assistant Sensor Magnets (Assistant Num) Settings

Sets the number of magnets on the PAS disk. The settable range is 5 to 24. The default is 12. Use [+] or [-] to adjust and [info] to confirm.

Interface images show the "Assistant Num" setting being adjusted.

Assist Level Settings (Power Set)

Configures the assist level modes. There are 8 modes available (e.g., 0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, 1-9). The default mode is 0-5. Use [+] or [-] to select a mode and [info] to confirm.

Interface images show the "Power Set" selection.

Current Limit Settings

Sets the controller over-current cut-off value. The adjustable range is 7.0A to 25.0A. The default is 15A. Use [+] or [-] to adjust and [info] to confirm.

Interface images show the "Current Limit" setting being adjusted.

Sensitivity Settings

Adjusts the sensitivity of the power assist sensor, determining how many magnets must pass before motor assist engages. Use [+] or [-] to choose the sensitivity value and [info] to confirm.

Interface images show the "Sensitivity" setting being adjusted.

Slow Start Settings

Configures the time duration before power assistance engages after pedaling starts. The range is 0-3, where 3 is the slowest. The default is 1. Use +/- buttons to select and [info] to confirm.

Interface images show the "Slow Start" setting being adjusted.

SOC View Settings

Allows selection between two battery SOC (State of Charge) display modes: percentage or voltage value. The default is percentage. Use [+] or [-] to choose and [info] to confirm.

Interface images show the "SOC V" setting being adjusted.

Auto-off Time Settings (Dormancy)

Sets the display's automatic shutdown time. Use [+] or [-] button to choose the desired duration. The default auto-off time is 5 minutes. Press [info] to confirm.

Interface images show the "Dormancy" setting being adjusted, displaying "3 Min".

Unit km/mile Toggling

Switches the unit of measurement for distance (e.g., kilometers or miles). The default is Metric (km). Use [+] or [-] to select the unit and [info] to confirm.

Interface images show the "Unit" setting, with an option to "Toggle Unit" between Metric and Mile.

Password Settings

Configures the power-on password. Access the password setting page by selecting 'Password' (?) in the menu and pressing [info]. The default password is '1212'.

Interface images show the password entry and confirmation screens.

Power-on Password Disable/Enable

To enable or disable Start Password settings, press the [+] or [-] button to select ON (?) or OFF (?). ON enables a power-on password, while OFF disables it. The default value is OFF. To enable, choose ON and press [info] to confirm, then input the current or default password ('1212'). Use [+] or [-] to change numbers and [info] to confirm digits. To disable, choose OFF and press [info] to confirm, then input the current password correctly. The screen displays 'Password Canceled Successfully'. The display password then restores to the default code '1212'.

Interface images illustrate the enable/disable process.

Power-on Password Reset

From the password menu, press the [+] or [-] button to select 'Reset Password' and press [info] to confirm. There are 3 pages for setting up a new password. In the first page, enter the current or default password ('1212') correctly. Then, move to the second page for inputting a new password. Use [+] or [-] to increase/decrease numbers and [info] to confirm digits one by one until a new 4-digit password is completed. Finally, it comes to the third page to re-enter the new password for confirmation. The screen displays 'Password Reset Successfully'. The new password will be required upon next power-on.

Interface images show the password change process.

Factory Settings

Restores the display to its default settings. Select YES (✔️) or NO (❌) using [+] or [-] and press [info] to confirm. The default is NO.

Interface images show the factory reset confirmation screen with "Restore NO" and "Restore YES" options.

Display Settings

Allows adjustment of basic display parameters, such as trip reset.

Trip Distance Clearance

To clear the trip distance, select Yes (✔️) or No (❌) using [+] or [-] and press [info] to confirm. 'Yes' represents clearing a single ride distance; 'No' represents not clearing a single ride distance.

Interface images show the "TRIP Reset" setting, toggling between "NO" and "Yes".

Exit Settings

Exits the current settings page and returns to the home screen. If no operation is performed for one minute, the display will automatically exit the settings state.

An interface image shows the "Exit" (↩️) button, leading back to the main display interface.

Quality Assurance and Warranty Scope

Warranty

• The warranty is valid for products used under normal conditions.
• The warranty period is 24 months from shipment or delivery.

Cases Not Covered by Warranty

1. Display is demolished.
2. Damage caused by incorrect installation or operation.
3. Shell broken after leaving the factory.
4. Wire is broken.
5. Damage due to force majeure (fire, earthquake, etc.).
6. Beyond the warranty period.

Connection Layout

Details on standard connector wiring for the display and mating controller side connector are provided.

Display-side connector: Shows a 5-pin connector with specific pin numbering and a "Bump" feature.

Mating connector from controller side: Shows a 5-pin connector with a "Groove" feature for alignment.

Wire Sequence Table

Note: Some displays use water-proof connectors where wire colors may not be visible.

Warnings

• Use the display with caution. Do not attempt to connect or disconnect the connector while the battery is on.
• Avoid hitting the display.
• Do not modify system parameters to prevent disorder.
• The display should be repaired if an error code appears.

Note: This manual is a universal version for DISPLAY KD718-X. Actual specifications may vary based on software versions. Always refer to the actual version.

Attached List 1: Error Code Definition