Key-Disp KD986 E-bike Display User Manual

Product Name and Model

Name: Intelligent TFT display for E-bike

Model: KD986

Specifications

• Power Supply: 24V/36V/48V
• Rated working current: 50mA
• The maximum working current: 200mA
• Off-state leakage current: <1μΑ
• Operating temperature: -20°C to 60°C
• Storage temperature: -30°C to 70°C

Appearance and Size

Display appearance and dimensional drawing (unit: mm):

The display features a screen showing current speed (e.g., 12.5 km/h), battery status (e.g., 70%), assist level (e.g., 5), trip distance (e.g., 0.0 km), odometer (e.g., 2 km), and power indication. The display unit has dimensions of approximately 77mm width and 59.4mm height. The mounting bracket has dimensions of approximately 45mm depth, 96mm height, and a diameter of Ø31.8mm.

Remote control appearance and dimensional drawing (unit: mm):

The remote control is designed for handlebar mounting and features buttons for power, assistance level adjustment ([+] and [-]), and information display ([i]). It has dimensions of approximately 42mm width, with a mounting diameter of R11.1, and a height of 39.7mm.

Function Summary

The KD986 display offers a comprehensive set of functions to meet user needs, including:

• Battery State of Charge (SOC) percentage indication
• Motor Power indication
• Assist-level indication
• Speed indication (including running speed, maximum speed, and average speed)
• Odometer and trip distance tracking
• Push-assistance function
• Trip time indication
• Backlight On/Off control
• Error code indication
• USB connection indicator
• Various Parameter Settings (e.g., wheel size, speed limit, voltage set, assistance level, controller limited current, password enable/change/disable)

General Operation

Switching the E-bike System On/Off

Briefly press the [power-button] to switch on the e-bike system. To switch off the system, hold the [power-button] for 2 seconds. When switched off, the e-bike system no longer uses battery power, with a leakage current of less than 1μΑ. The system also switches off automatically after 10 minutes of parking.

Display Interface

After switching on the e-bike system, the display defaults to showing Speed and Trip Distance. Pressing the [i] button cycles through the following elements: Trip (Km) → ODO (Km) → Max. Speed (Km/h) → Avg. Speed (Km/h) → Time (Min.).

Display Indication Cycle Interface: Visual representation showing the transition between different data displays on the screen.

Switching Push-assistance Mode On/Off

To activate the push-assistance function, hold the [-] button. After 2 seconds, the e-bike's drive is activated at a uniform speed of 6 Km/h, indicated on the screen. The push-assistance function is automatically switched off when the [-] button is released, and the e-bike system immediately stops power output.

Push-assistance Mode: This function is intended for use only when pushing the e-bike. Users should be aware of the potential danger of injury if the e-bike's wheels do not have ground contact while using this feature.

Switching the Lighting On/Off

To switch on the headlight, hold the [light-icon] button. The backlight brightness is automatically reduced. Holding the [light-icon] button again switches the lighting off.

Switching the Lighting Mode On/Off Interface: Visual representation of the lighting control.

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 level "0" to level "5". Level "0" provides zero output power, while level "1" is the minimum power and level "5" is the maximum power. If level "5" is reached and the [+] button is pressed again, the interface will continue to show "5" and blink to indicate maximum power. If level "0" is reached and the [-] button is pressed again, the interface will continue to show "0" and blink to indicate minimum power. The default assist level is "1".

Display Indicators

Assist Level Interface

Visual representation of the assist level selection screen.

Battery SOC Indicator

By default, the battery SOC is displayed as a percentage. The battery bar is shown in green color when the battery is in high voltage. When the percentage is less than 20%, a red square appears, indicating that the battery needs to be recharged immediately.

Battery SOC Indication Interface: Visual representation showing battery levels at 100%, 80%, 60%, 40%, 20%, and 0%.

Motor Power Indicator

The power of the motor can be read via the interface.

Motor Power Indication Interface: Visual representation of the motor power display.

USB connection indication

When the display is connected to a USB external device, the display interface will show as depicted.

USB Connection Indication Interface: Visual representation of the USB connection status.

Error Code Indication

The components of the e-bike system are continuously and automatically monitored. When an error is detected, the respective error code is indicated in the text indication area. Detailed error messages are provided in Attached list 1.

Error Code Indication: Visual representation showing an example error code (Error Code: 30, Communication fault).

Note: If an error code appears, the display may require repair. It is recommended to refer to an authorized dealer for service. Failure to do so may prevent normal riding of the bike.

Settings

To access the settings menu, press the [power-button] to switch on the display. Then, hold both the [+] and [-] buttons for 2 seconds to enter the Setting page, which includes Display settings and Advanced settings.

Setting interface: Visual representation of the main settings menu.

Note: All settings must be operated while the e-bike is parked.

Dormancy Settings

Dormancy refers to the display's auto-off time settings. To change the automatic shutdown time, navigate to 'Dormancy' and use the [+] or [-] button to select the desired duration. The default auto-off time is 5 minutes. Press the [i] button to store any changed setting.

Dormancy setting interface: Visual representation of the dormancy settings screen.

Trip Distance Clearance

Trip Reset is the setting for clearing trip distance. To clear the trip distance, press the [+] or [-] button to select 'Yes' or 'No'. 'Yes' clears a single ride distance, while 'No' does not clear any distance. Press the [i] button to store the changed setting.

Trip Distance Clearance Settings Interface: Visual representation showing the TRIP Reset option set to NO or YES.

AL sensitivity

AL sensitivity relates to Ambient Light Sensor settings, which automatically adjust screen brightness based on ambient light conditions. When riding at night or in low-light environments, the display backlight and bike light will turn on automatically. The AL sensor sensitivity ranges from 1 to 5, with 'OFF' disabling the light sensor function. The default value is 3. Use the [+] or [-] button to choose the desired sensitivity value. Press the [i] button to store the changed setting.

AL sensitivity setting interface: Visual representation showing AL Sensitivity settings.

Unit km/mile Conversion

Toggle Unit allows for changing the display units. Press the [+] or [-] button to choose the desired unit (Metric or Imperial) and press the [i] button to confirm. The default unit is "Metric (km)". Press the [i] button to store the changed setting.

Mile and Kilometer Toggling Interface: Visual representation of the unit selection.

LCD luminance Settings

LCD luminance controls the backlight brightness. A lower percentage value results in lower backlight brightness. To change the backlight brightness, press the [+] or [-] button to select the desired percentage. Press the [i] button to store the changed setting.

LCD luminance Settings Interface: Visual representation of the LCD luminance settings.

Password Settings

Password settings allow for configuring a power-on password for the display. To access the password setting page, select 'Password' from the menu and press the [i] button to confirm.

Password Management

Password Set

The power-on password is a 4-digit code. The default password is '1212'.

Password Setting Interface: Visual representation of the password setting screen.

1. Power-on Password Disable/Enable

To enable or disable the Start Password feature, press the [+] or [-] button to select 'ON' or 'OFF'. 'ON' enables the password protection, while 'OFF' disables it. The default value is 'OFF'. To enable a power-on password, select 'ON', press the [i] button to confirm, and then input the current password or the default password '1212'. Use the [+] or [-] buttons to change each digit and press the [i] button to confirm each digit until the password is fully entered. To disable the current password, select 'OFF', press the [i] button to confirm, and input the current password correctly. The screen will display 'PassWord Canceled Successfully', and the display will revert to using the default code '1212'.

Password Enable/Disable Settings Interface: Visual representation of the password enable/disable process.

2. Power-on Password Reset

From the previous interface, press the [+] or [-] button to select 'Reset PassWord' and press the [i] button to confirm. This will access the power-on password reset interface, which consists of three pages for setting up a new password. On the first page, enter the current password or the default password '1212' correctly. The system then proceeds to the second page for inputting a new password. Use the [+] or [-] buttons to increase or decrease the number for each digit, and press the [i] button to confirm each digit until a new 4-digit password is completed. Finally, the third page requires re-entering the new password for confirmation. The screen will then display 'PassWord Reset Successfully'. The next time the e-bike system is switched on, the new password must be entered to power on the display.

Password Change Interface: Visual representation of the password change process.

Factory Defaults

This function resets the display to factory default settings. Press the [+] or [-] buttons to choose 'YES' or 'NO' for resetting. The default option is 'NO'. Press the [i] button to store the selected setting.

Factory defaults setting interface: Visual representation of the factory default reset option.

Advanced Settings

Wheel Diameter Settings

Wheel diameter settings allow adjustment of the display's basic settings related to wheel size. Press the [+] or [-] button to increase or decrease the value until the desired wheel diameter is displayed. The default value is 28 inches. Press the [i] button to confirm and store the changed setting.

Speed-limit Settings

Speed Limit settings define the maximum allowed speed. If the current speed exceeds the set speed limit, the e-bike system will automatically switch off. The speed limit range is from 15 Km/h to 99.9 Km/h. To change basic settings, press the [+] or [-] button to increase or decrease the value until the desired speed limit is displayed. Press the [i] button to confirm. Press the [i] button again to store the changed setting.

Speed limit settings interface: Visual representation of the speed limit adjustment.

MODE

The display offers two mode options: ECO and SPORT. Press the [+] or [-] buttons to change the mode option. Sport mode engages the motor for high-speed running, providing more active assistance response and better power strength for faster acceleration. Economy mode operates the motor at a lower speed, with a relatively lower power assist response and acceleration, but it conserves battery power.

MODE setting page: Visual representation of the mode selection screen (e.g., Sport/ECO).

Speed Sensor

Speed Sensor settings allow configuration of the speed sensor. To change these settings, press the [+] or [-] button to select the quantity of magnet poles on the e-bike spoke. The range for this setting is from 1 to 15. The default value is 1. Press the [i] button to confirm and store the changed setting.

Speed sensor setting: Visual representation of speed sensor settings.

Power Assistant Sensor Magnets

Assistant represents the number of magnets in the Pedal Assist Sensor (PAS) disk. To change the magnet number of the power assist sensor, press the [+] or [-] button to choose the desired number.

Assistant setting interface: Visual representation of assistant settings.

Battery Power Bar Settings

Set Voltage settings configure the battery voltage segmented values, which are switchable between 36V and 48V. Five bar-voltage values for either 36V or 48V must be entered one by one. For example, when setting for 48V, "1-" represents the first bar's voltage value, with a default of 41.2V. Use the [+] or [-] button to increase or decrease the voltage values. Press the [i] button to store the changed setting and proceed to the next bar voltage setting. After all five bar-voltage values are entered, press the [i] button to confirm.

Battery Voltage Settings Interface: Visual representation of battery voltage settings.

Assist Level Settings

Assist Level Mode Options.

Power Set: This setting configures assist levels. In assist level mode settings, there are 8 available modes for selection: 0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, and 1-9. To change the assist level mode, press the [+] or [-] button to choose the desired mode and press the [i] button to confirm.

Assist Level Mode Settings Interface: Visual representation of assist level mode selection.

Slow Start

When stepping on the pedal, there is a time duration before the motor assist engages. This time duration setting ranges from 1 to 4, where 4 is the slowest. The default value is 1. Press the [+] or [-] buttons to change the slow start value and press the [i] button to store the changed setting.

Slow start setting page: Visual representation of slow start settings.

ACF

ACF refers to the charging switch setting. '0' signifies OFF, and '50' signifies ON. Press the [+] or [-] buttons to change the setting and press the [i] button to save the changed setting.

ACF setting page: Visual representation of ACF settings.

CRU

CRU denotes the CRUISE function. Press the [+] or [-] buttons to switch the cruise mode ON or OFF. Press the [i] button to store the changed setting. When the display maintains a stable speed, the cruise mode can be activated, allowing the bike to run at a fixed speed.

Cruise mode setting: Visual representation of cruise mode settings.

Note: If there are no setting operations for one minute, the display will automatically exit the settings state.

Quality Assurance and Warranty Scope

Warranty

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

The following cases do not belong to our warranty scope:

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

Connection Layout

Socket type male connector (display is cable free):

Visual representation of the display-side socket and the mating connector from the controller side, showing pin configurations labeled 'Bump' and 'Groove' with pin numbers 1 through 5.

Wire sequence table

Warnings and Error Codes

Note: Some displays feature wire connections with water-proof connectors, making the color of lead wires in the harness not visible.

Warnings:

• Use the display with caution. Do not attempt to release or link the connector when the battery is on.
• Try to avoid hitting the display.
• Do not modify system parameters to avoid potential disorder.
• The display should be repaired when an error code appears.

Note: This manual instruction is a universal version for DISPLAY KD986. Some versions of this display may differ in specification from the software. Please always refer to an actual version.

Attached list 1: Error code definition