Key-Disp KD718 eBike Display User Manual

Product Name and Model

Name: Intelligent colored LCD for E-bike

Model: KD718

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

Display Appearance and Dimensional Drawing (unit: mm):

The eBike display unit is a rectangular device with a screen. Dimensions are provided for its physical form. The main display unit has a width of approximately 49.96 mm and a height of approximately 74.4 mm. It is designed to be mounted on an eBike handlebar. A separate drawing shows a side view with mounting bracket, indicating dimensions such as a diameter of 31.8 mm for handlebar attachment and a total height of approximately 97.95 mm.

The display screen itself shows various parameters like battery level (90%), time (19:45), current power (682W), speed (20.5 km/h), assistance level (PAS 3), ODO (25.5 km), and TRIP (20.1 km).

Remote Control Appearance and Dimensional Drawing

Remote Control Appearance and Dimensional Drawing (unit: mm):

The remote control is a compact, ergonomic unit designed for handlebar mounting. It features several buttons, including directional arrows (+, -, up, down) and a central 'i' button. The remote control has a width of approximately 42 mm and a height of approximately 39.7 mm. The mounting clamp has a radius of R11.1 and a width of approximately 16.2 mm.

Function Summary

The KD718 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 (including real-time speed, maximum speed, 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 the E-bike system off, hold the power button for 2 seconds when the display is on. This stops power usage by the battery. When switching off, the leakage current is less than 1μA. The E-bike system also switches off automatically if the e-bike is parked for more than 5 minutes.

Display Interface

After the E-bike system is switched on, the display shows real-time Speed and Trip Distance by default. Pressing the “i” button cycles through the following elements:

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

The display interface cycle shows transitions between these metrics, illustrating how the screen changes when cycling through the information.

Switching Push-assistance Mode On/Off

To activate the push-assistance function, hold the “-” button for 2 seconds. The e-bike's drive is activated at a speed of less than 6 Km/h, and the screen displays a specific icon [walking person icon]. The push-assistance function deactivates immediately upon releasing the “-” button, and the e-bike system stops power output.

Note: The push-assistance function should only be used when pushing the e-bike. Be aware of potential injury if the e-bike wheels lose ground contact while using this function.

Switching the Lighting On/Off

To turn on the bike light, hold the “+” button. The backlight brightness is automatically reduced. Holding the “+” button again turns the lighting off.

Assist Level Selection

Briefly press the “+” or “-” button to switch between assistance levels, thereby changing the motor output power. The default assistance level ranges from “0” to “5”. Level “0” provides zero output power, while Level “1” is the minimum power, and Level “5” is the maximum power. If you reach Level “5” and press “+”, the display will continue to show “5” and blink to indicate maximum power. If you reach Level “0” and press “-”, the display will show “0” and blink to indicate minimum power. The default assistance level is “1”.

Battery SOC Indicator

The battery status is indicated by five bars. These bars are bright when the battery has high voltage. When the percentage is 0%, the battery requires immediate recharging.

The display shows different levels of charge: 100%, 80%, 60%, 40%, 20%, and 0%.

Motor Power Indicator

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

USB Connection Indication

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

Error Code Indication

The e-bike system continuously monitors its components. When an error is detected, a corresponding error code is displayed in the text indication area. Detailed messages for error codes can be found in "Attached list 1".

Note: Have the display repaired if an error code appears, as it may prevent normal riding. Always refer to an authorized dealer.

Setting

To access the settings menu, ensure the e-bike is stationary and the display is on. Then, hold both the “+” and “-” buttons for 2 seconds.

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

Wheel Diameter Settings

This setting configures the wheel diameter. To change the value, press the “+” or “-” button to increase or decrease until the desired value is displayed. The default value is 26 inches. Press the “i” button to confirm and save the setting.

Speed-limit Settings

This setting defines the maximum speed limit for the e-bike system. If the current speed exceeds the set limit, the system will reduce power output. The speed limit can be set between 15 Km/h and 40 Km/h. The default value is 25 Km/h. Use the “+” or “-” buttons to adjust the value and press “i” to confirm.

Backlight Brightness Settings

This setting adjusts the brightness of the display backlight. Level 5 offers the highest brightness, while lower levels reduce brightness. Use the “+” or “-” buttons to select the desired brightness level. Press “i” briefly to confirm.

Battery Power Bar Settings

This feature allows segmentation of battery voltage values for display. The system supports 36V/48V. Five bar-voltage values need to be entered sequentially for either 36V or 48V. For example, with 48V, the first bar voltage value defaults to 41.2V. Use the “+” or “-” buttons to adjust voltage values and press “i” to store each value and proceed to the next. Press “i” after entering all five values to confirm.

Advanced Settings

This section allows configuration of various PAS (Power Assist System) parameters.

Speed Sensor Settings

Configure the number of magnets on the e-bike spoke for the speed sensor. The settable range is from 1 to 15. The default value is 1. Use “+” or “-” to adjust and “i” to confirm.

Power Assistant Sensor Magnets (Assistant Num) Settings

Set the number of magnets on the PAS disk. The settable range is from 5 to 24. The default value is 12. Use “+” or “-” to adjust and “i” to confirm.

Assist Level Mode Options (Power Set)

Configure the assist level modes. There are 8 modes available: 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 press “i” to confirm.

Current Limit Settings

Set the controller over-current cut-off value. The adjustable range is from 7.0A to 25.0A. The default value is 15A. Use “+” or “-” to adjust the current value and press “i” to confirm.

Sensitivity Settings

Adjust the sensitivity of the power assist sensor. This determines how many magnets must pass the sensor before motor assist engages. Use “+” or “-” to choose the sensitivity value. The default value can be customized. Press “i” to confirm.

Slow Start Settings

Configure the slow start-up duration. This is the time delay before power assistance is provided after pedaling begins. The range is “0-3”, where “3” is the slowest. The default value is “1”. Use “+/-” to choose the desired value and press “i” to confirm.

SOC View Settings

Choose the display mode for battery SOC (State of Charge). Options are percentage value or voltage value. Use “+” or “-” to select the desired method. The default view is by percentage. Press “i” briefly to confirm.

Auto-off Time Settings (Dormancy)

Set the display's automatic shutdown time. Use the “Dormancy” option and then press “+” or “-” to choose the desired duration. The default auto-off time is 5 minutes. Press “i” briefly to confirm.

Unit km/mile Toggling

Select the unit of measurement for distance. Use the “+” or “-” button to choose between Metric (km) and Imperial (miles). The default unit is Metric (km). Press “i” to confirm.

Password Settings

Configure power-on password settings. To access the password setting page, select ‘Password’ from the menu and press “i”.

Power-on Password Disable/Enable

To enable or disable the start password, select ON or OFF using the “+” or “-” button. ON enables the password, while OFF disables it. The default value is OFF. To enable, select ON, press “i”, and input the current or default password (‘1212’). Use “+”/“-” to change digits and “i” to confirm each digit. To disable, select OFF, press “i”, and input the current password correctly. The screen will display ‘Password Canceled Successfully’, and the password will revert to the default ‘1212’.

Power-on Password Reset

From the password menu, select ‘Reset Password’ and press “i” to access the reset interface, which spans three pages. First, enter the current or default password (‘1212’). Then, on the second page, input a new 4-digit password using “+”/“-” to change numbers and “i” to confirm each digit. Finally, on the third page, re-enter the new password for confirmation. The screen will display ‘Password Reset Successfully’. The new password will be required upon the next power-on.

Factory Settings

This option restores the display to its default settings. To reset, select YES or NO using the “+” or “-” button. The default is NO. Press “i” to confirm the selection.

Display Settings

This section allows basic display parameter adjustments, such as trip reset.

Trip Distance Clearance

To clear the trip distance, select Yes or No using the “+” or “-” button. ‘Yes’ clears the single ride distance, while ‘No’ does not. Press “i” briefly to confirm.

Exit Settings

Use the ‘Exit’ option to return to the home screen from the settings pages. If there are no operations for one minute, the display will automatically exit the settings state.

Quality Assurance and Warranty Scope

Warranty

• The warranty is valid only for products used under normal usage conditions.
• The warranty is valid for 24 months after shipment or delivery to customers.

Cases Not Covered by Warranty

1. The display is demolished.
2. Damage caused by incorrect installation or operation.
3. Broken shell when the display is out of the factory.
4. Broken wire of the display.
5. Fault or damage caused by force majeure (e.g., fire, earthquake).
6. Beyond the warranty period.

Connection Layout

Standard Connector Wiring:

The document includes diagrams showing the display-side connector and the mating connector from the controller side. These connectors have multiple pins (numbered 1 through 5) and specific keying (e.g., 'Bump', 'Groove') to ensure correct alignment.

Wire Sequence Table:

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

Warnings

• Use the display with caution. Do not attempt to release or connect the connector while the battery is on.
• Try to avoid hitting the display.
• Do not modify system parameters to prevent parameter disorder.
• Have the display repaired when an error code appears.

This manual is a universal version for DISPLAY KD718. Some versions may differ in specification or software. Always refer to the actual version.

Attached List 1: Error Code Definition