Key-Disp KD21C User Manual
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Key-Disp KD21C User Manual

E-bike intelligent lcd display
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  • Page 2: Table Of Contents

    Contents Product name and model................................. 1 Specifications..................................... 1 Appearance and dimension..............................1 Function and button definition..............................2 ◆Function summary................................2 ◆Function layout................................... 2 ◆Button definition................................. 2 Installation....................................3 General operations..................................3 ◆Switch E-bike system ON/OFF............................3 ◆Display interface.................................3 ◆Switch push-assistance mode ON/OFF......................... 4 ◆Switch lighting ON/OFF..............................
  • Page 3 ◆Speed sensor settings(optional)..........................13 ◆Throttle function settings(optional)..........................14 Throttle push assist enable/disable settings......................14 Throttle level enable/disable settings.......................... 14 ◆System settings（optional）............................15 Battery power delay time settings..........................15 Maximum speed limits..............................15 Push assist button enable/disable..........................16 Slow start up settings..............................16 ◆Power-on password settings............................17 Power-on password Enable/Disable..........................17 Power-on password change............................18...

  • Page 4: Product Name And Model

    Product name and model E-bike Intelligent LCD Display Model: KD21C. Specifications ●24V/36V/48V Power Supply ●Rated working current: 10mA ●The maximum working current: 30mA ●Off-state leakage current: <1μA ●Working temperature:-20℃~ 60℃ ●Storage temperature: -30℃~ 70℃ Appearance and Size Product appearance and dimensional drawing (unit: mm)

  • Page 5: Function And Button Definition

    Function Summary and Button Definition ◆Function Summary KD21C has many functions to meet riders’ needs. The indication elements are as follows： ●Battery level ●Motor output power ●Assist level ●Speed indication (incl. current speed, Max. speed and Avg. speed) ●ODO and Trip ●Push-assistance function...

  • Page 6: Installation

    Installation KD21C can be mounted on the left side of handlebar close to its grip. Adjust the angle for a good screen view. Cut off the power before connecting the corresponding connectors between display and controller. General Operation ◆Switching the E-bike System mode ON/OFF To switch on the E-bike system and provide the power supply to the controller, hold the On/Off button for 2s.

  • Page 7: Switch Push-Assistance Mode On/Off

    ◆Switching Push-assistance mode ON/OFF To activate the push-assistance function, press and hold the DOWN button. After 2 seconds, E-bike is activated to go at a uniform speed of 6 Km/h while the screen displays “P”. The push-assistance function will be switched off as soon as you release the DOWN button. Push-assistance mode ■Push-assistance function may only be used when pushing the E-bike.

  • Page 8: Assist Level Selection

    ◆Assist Level Selection The assist level of the E-bike drive can be changed anytime, even during riding. The assist level ranges from 0 to 5 (level 0 to level 5). The default assist level is “1” when the display is started. The output power is zero on Level “0”. Level “1” is the minimum output power. Level “5” is the maximum output power.

  • Page 9: Error Code Indication

    ◆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 text indication area. Refer to detailed definition of the error codes in Attached list 1. Error Code Indication ■Have the display inspected and repaired when an error code appears.

  • Page 10: Backlight Brightness

    ◆Backlight settings bL represents backlight settings. Level “1” is the lowest brightness. Level “2” is the medium brightness. Level “3” is the highest brightness. The default value is “1”. To change the backlight brightness, press the UP/DOWN button to increase or decrease until the desired brightness is displayed.

  • Page 11: General Parameters Settings

    General Parameter Settings To access general parameter settings interface, hold both the UP and the DOWN button simultaneously for 2s to enter General Settings, then hold both the DOWN and ON/OFF button for 2s again to enter General Parameter Settings. ◆Wheel Diameter Settings Ld represents wheel diameter settings.

  • Page 12: Personalized Parameters Settings

    Personalized Parameter Settings Personalized Parameter Settings can meet a variety of riders’ personalized requirements. 8 settings are Battery Power Bar Settings, Power assist level Settings, Over-current Cut Settings, Power Assist Sensor Settings, Speed Sensor Settings, Throttle Function Settings, System Settings and Power- on Password Settings.

  • Page 13: Battery Power Bar Settings

    ◆Battery Power Bar Settings VOL represents voltage settings. Each bar represents a voltage value. Each of the 5 values is to be entered one by one. For example, VOL 1 is the first bar voltage value, the default value is 31.5V. Press UP or DOWN button to increase or decrease the bar value and press ON/OFF button to store a changed setting and access the second bar.

  • Page 14: Assist Level Ratio Settings

    Assist Level Ratio Settings The speed of each level can be adjusted to meet different riders’ needs by setting the ratios. For example, the default ratio is 50% for level “1”; the ratio range is 45%-55% for Level ”1”. To change the ratio of a certain assist level, press the UP/DOWN button to choose the desired ratio value, and then press the "ON/OFF"...

  • Page 15: Power Assist Sensor Settings(Optional)

    ◆Power Assist Sensor Settings PAS represents power assist sensor settings. Power Assist Sensor Direction Settings “run-F” means forward direction while “run-b” means backward direction. The default value is “run-F”. Press the UP/DOWN button to select F or b to change the direction of Power Assist Sensor. Press the ON/OFF button and then access PAS sensitivity settings.

  • Page 16: Pas Magnet Quantity Settings

    PAS Magnet Quantity Settings N represents the number of magnets on PAS disk. The default value is 12. Press the UP/DOWN button to select the number of magnets on PAS disk. Hold the ON/OFF button for 2s to confirm and return to previous menu. PAS Disk Magnet Quantity settings ◆Speed Sensor Settings SPS represents speed sensor settings.

  • Page 17: Throttle Function Settings(Optional)

    ◆Throttle Function Settings Throttle Push-assistance Enable/Disable HL represents throttle push-assistance function. HL-N means throttle push-assistance function is disabled. HL-y means throttle push-assistance function is enabled. The default value is HL-N. Press the UP/DOWN button to select Y or N to enable or disable throttle push-assistance function . To enable throttle push-assistance, select Y and hold ON/OFF button for 2s to confirm and return to previous menu.

  • Page 18: System Settings（Optional

    ◆System Settings Delay time settings for battery power DLY represents battery power delay time settings. The default value is 3s. Press the UP/DOWN button to choose delay time 3s, 6s, 12s to change the settings. Press the ON/OFF button to confirm and access the max speed limit settings. Battery power delay time Interface Max speed limit settings MAX SPD represents max speed limit settings.

  • Page 19: Push Assist Button Enable/Disable

    Push-assistance Enable/Disable PUS represents push-assistance enable/disable settings. “Y” means push-assistance is enabled, “N” means push-assistance is disabled. The default value is “Y”. Press the UP/DOWN button to choose “Y” or “N” to change push-assistance settings. Press the ON/OFF button to confirm and then access slow start up settings. Push-assistance settings Interface Slow Start up Settings SSP represents slow start up.

  • Page 20: Power-On Password Settings

    ◆Power-on Password Settings PSd represents power-on password settings. Power-on password is a 4-digit code. The default password is “1212”. Press ON/OFF button to enter the interface where “P2, 0000” is shown on the screen. Please input the current password or default password’1212’. Press UP/DOWN button to increase or decrease the number and press i button to confirm digits one by one until the correct 4-digit password is completed.

  • Page 21: Power-On Password Change

    Power-on Password Change When the display shows P3, 0000, press UP/DOWN to change the number and then press ON/OFF button to confirm digits one by one until a new 4-digit password is completed. To store the new power-on password, hold ON/OFF button for 2 s and then exit settings. When you switch on the E-bike system next time, the display will show P1,0000, please input the new password to power on.

  • Page 22: Recover Default Settings

    Recover default settings dEF represents recovering default settings. The default value is N. To access recover default settings, hold both UP and ON/OFF button for 2s and then access selection interface. Press the UP/DOWN button to choose “Y” or “N”. “N” means not recovering default settings.

  • Page 23: Wire Connection Layout

    4. Make the display repaired when error code appears. ■ This manual instruction is a universal version for DISPLAY KD21C. Some versions of this display may be different from specification to specification as to the software. Please always refer to an...

  • Page 24: Attached List 1：Error Code Definitions

    Attached list 1: Error code definition Error Code Definition Current Abnormality Throttle Abnormality Motor Phase Abnormality Motor Hall Signal Abnormality Brake Abnormality Communication Abnormality Attached list 2: Personalized Parameter settings Settings item Symbol Battery Power Bar Settings Power assistant level Settings Over-current Cut Settings Power Assistant Sensor Settings Speed Sensor Settings...
  • Page 25 Attached list 4：Other symbols Symbol Definition Trip distance clearance Backlight Unit Voltage Wheel diameter Speed limit Controller over-current cut Backward Forward Sensitivity of PAS Speed sensor Power delayed time Throttle power assist walk Throttle-changing Button push Slowly start up Password Recover default...

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