Electric Bike Display User's Manual

1. Product Name and Model Number

Smart LCD display for electric bicycle; Model: YL81F.

2. Specification

• Power supply: 24V/36V/48V
• Display rated current: 15mA
• Display maximum current: 30mA
• Shutdown leakage current: <1uA
• Supplied current to the controller: 50mA
• Operating temperature: -20°C to 60°C
• Storage temperature: -30°C to 70°C

3. Appearance and Size

The YL81F display is a rectangular LCD screen designed for electric bicycles. It features a clear digital interface showing speed, battery level, PAS level, and other riding information.

Control Buttons: The display unit is operated via control buttons. The manual shows physical pictures of the K5 and K6 control buttons, which typically include functions like power, mode switching, and adjustments.

Dimensions:

• Front View: 59.5mm width, 86.0mm height.
• Side View: 71.2mm depth, with a handlebar clamp diameter of Ø31.8mm.

4. Function Overview and Functional Areas

4.1 Functional Overview

The YL81F display offers a variety of features to suit your riding needs, including:

• Battery level indicator
• Pedal assist (PAS) level indicator
• Speed display (current, maximum, average)
• Mileage display (single and total mileage)
• Walk boost mode
• Light ON/OFF control
• Error code indicator
• Optional indicators for motor power, USB connection, cruise control, and Bluetooth connection.
• Personalized parameter settings for customization (e.g., wheel diameter, speed limit, battery power, PAS settings, password, current limit).
• Factory default parameter recovery function.

4.2 Functional Areas

The display interface is divided into several key areas:

• Battery Level: Typically shown as a series of bars.
• Error Code: Displays error codes when faults occur.
• Current Speed: Shows the real-time speed.
• Walk Boost: Indicator for walk assist mode.
• Trip Odometer, Odometer, Max Speed, Average Speed: Displays for tracking distance and speed metrics.
• PAS Level: Indicates the current pedal assist level.
• Light ON/OFF: Control for the bike's lights.
• Bluetooth, USB: Indicators for connectivity.
• Speed Unit: Displays speed in KM/H or MPH.
• Cruise: Indicator for cruise control.
• Value and Unit: Displays for various settings and units (e.g., Wh, Ah, V).

4.3 Button Definitions

The YL81F display is operated using five buttons on the control unit:

• Power ON/OFF button (⏻)
• Plus button (➕)
• Minus button (➖)
• Light button (?)
• Toggle/Info button (ℹ️)

5. Routine Operation

5.1 Power On/Off

To power on/off the display: Long press the power button (⏻). When the display is off, it consumes minimal battery power (leakage current less than 1uA).

Automatic Shut-off: The display will automatically shut off if not used for more than 10 minutes.

5.2 Display Interface Switching

When powered on, the display defaults to showing Current Speed (km/h) and Trip Odometer (km). Short press the toggle button (ℹ️) to cycle through different displays:

• Trip Odometer (km)
• Odometer (km)
• Maximum Speed (km/h)
• Average Speed (km/h)

[Description of display switching sequence showing Trip Odometer, Odometer, Average Speed, Maximum Speed]

5.3 Walk Boost Mode

To activate walk boost mode: Long press the power button (⏻) and the minus button (➖) simultaneously. The electric bicycle will move at a fixed speed of 6 km/h, indicated on the display.

To stop walk boost: Release the buttons. Power output will stop immediately, and the display will return to its previous state.

[Description of walk boost display]

Note: Walk boost mode is intended for pushing the electric bicycle and should not be used while riding.

5.4 Turning On/Off Lights

Press the light button (?) to turn on the bicycle's lights; the display backlight will dim. Press the light button (?) again to turn off the lights, and the backlight will restore its brightness.

[Description of backlight display interface]

5.5 PAS Level Selection

Press the plus (➕) or minus (➖) buttons to switch the Pedal Assist System (PAS) level, which adjusts the motor's output power.

[Description of PAS level display interfaces showing different levels, e.g., 1, 3, 5]

5.6 Battery Level Display

The battery level is indicated by 5 bars. All bars are lit when the battery is full. When the battery is nearly depleted, the bars will flash to alert the user to recharge.

[Description of battery level display: Full power, Four bars power, Three bars power, Two bars power, One bar power, Empty power flashing]

5.7 Error Code Display

If a fault occurs in the electric system, the display will automatically show an error code. Refer to Schedule 1 for detailed error code definitions.

[Description of error code display, e.g., "ERROR 30"]

Note: If an error code appears, troubleshoot the issue promptly, as the electric bicycle may not function correctly until the problem is resolved.

6. Personalized Parameter Settings

Important: All parameter settings must be performed while the bicycle is stationary and the speed reads 0.

Procedure:

1. Press and hold the power button (⏻) and the toggle button (ℹ️) simultaneously for more than 2 seconds to enter the personalized parameter setting interface.
2. Press the plus (➕) or minus (➖) buttons to navigate between setting interfaces, and press the toggle button (ℹ️) to enter the parameter changing state.
3. Use the plus (➕) or minus (➖) buttons to select the desired parameter value. Long press the plus (➕) for addition or the minus (➖) for subtraction.
4. Press the toggle button (ℹ️) to save the current parameter setting and return to the main setting interface.
5. Long press the toggle button (ℹ️) to save all parameter settings and exit the personalized parameter setting interface.

The following parameters can be customized:

6.1 Backlight Luminance Setting

Parameter 01P controls backlight luminance. Available settings are 01 (minimum), 02 (standard), and 03 (maximum).

Press the toggle button (ℹ️) to enter the modification interface. Use the plus (➕) or minus (➖) buttons for selection. Press the toggle button (ℹ️) again to save and return.

[Description of backlight luminance setting interface showing '01P' and '01']

6.2 Metric and Imperial Setting

Parameter 02P sets the units. 00 selects Metric (km/h), and 01 selects Imperial (mph).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of metric/imperial setting interface showing '02P' and '00' or '01']

6.3 Rated Voltage Setting

Parameter 03P sets the rated voltage. Available options are 24V, 36V, and 48V.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of rated voltage setting interface showing '03P' and a voltage value like '48V']

6.4 Auto Sleep Time Setting

Parameter 04P sets the auto sleep time. This feature turns off the display after a period of inactivity to save battery. The adjustable range is 1-60 minutes. Setting 00 disables auto shutdown. The factory default is 10 minutes.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of auto sleep time setting interface showing '04P' and a time value like '10']

6.5 PAS Level Setting

Parameter 05P configures the PAS levels. Available settings include ranges like 0-3, 1-3, 0-5, 1-5, 1-7, 0-7, 0-9, 1-9.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of PAS level setting interface showing '05P' and a range like '0-5']

6.6 Wheel Diameter Setting

Parameter 06P sets the wheel diameter. The adjustable range is 1-50 inches.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of wheel diameter setting interface showing '06P' and a diameter like '26.0']

6.7 Number of Speed Sensor Magnets Setting

Parameter 07P sets the number of speed sensor magnets. The adjustable range is 1-255 pieces.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of speed sensor magnets setting interface showing '07P' and a count like '12']

6.8 Speed Limit Setting

Parameter 08P sets the speed limit. The adjustable range is 1-100 km/h. Note that the maximum adjustable speed limit may vary by protocol.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of speed limit setting interface showing '08P' and a speed like '25']

6.9 Start-up Setting

Parameter 09P configures the start-up mode. Options are 00 for zero start (requires initial pedal rotation) and 01 for non-zero start (motor engages immediately upon power-on).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of start-up setting interface showing '09P' and '00' or '01']

6.10 Drive Mode Setting

Parameter 10P selects the drive mode. Options are: 00 (Pedal assist only), 01 (Electric only), and 02 (Both Pedal assist and electric).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of drive mode setting interface showing '10P' and '02']

6.11 Pedal Assist Sensitivity Setting

Parameter 11P adjusts pedal assist sensitivity. Higher numbers require more pedal rotations to activate the motor, while lower numbers require fewer rotations. The adjustable range is 1-24.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of pedal assist sensitivity setting interface showing '11P' and a value like '02']

6.12 Pedal Assist Strength Setting

Parameter 12P sets the pedal assist strength, which is the relative strength of the PWM signal from the controller. The range is 0 (weakest) to 5 (strongest).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of pedal assist strength setting interface showing '12P' and a value like '02']

6.13 Number of Pedal Assist Sensor Magnets Setting

Parameter 13P sets the number of pedal assist sensor magnets. Available options are 5, 8, or 12 pieces.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of pedal assist sensor magnets setting interface showing '13P' and a count like '12']

6.14 Controller Current Limit Setting

Parameter 14P sets the controller current limit. The adjustable range is 1-50A.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of controller current limit setting interface showing '14P' and a value like '15']

6.15 Battery Under Voltage Value Setting

Parameter 15P sets the battery under voltage threshold. This value can be adjusted based on the current rated voltage.

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of battery under voltage setting interface showing '15P' and a voltage like '31.5V']

6.16 ODO Resets Setting

Parameter 16P configures the ODO reset behavior. Options are 00 (non-reset) and 01 (reset).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of ODO resets setting interface showing '16P' and '01']

6.17 Controller Cruise Control Setting

Parameter 17P enables or disables the controller's cruise control function. Options are 00 (disable) and 01 (enable).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of controller cruise control setting interface showing '17P' and '01']

6.18 6km/h Walk Boost Setting

Parameter 18P controls the 6km/h walk boost function. Options are 00 (turn off) and 01 (turn on).

Press the toggle button (ℹ️) to enter parameter changing state. Use ➕/➖ to select, and ℹ️ to save.

[Description of 6km/h walk boost setting interface showing '18P' and '01']

7. Shortcut Operation

7.1 Restore Factory Settings Operation

To restore factory default parameter settings:

1. Enter the main setting interface and ensure the speed is 0.
2. Press and hold the minus button (➖) and the toggle button (ℹ️) simultaneously for 2 seconds to enter the restore factory default setting interface.
3. Press the plus (➕) or minus (➖) buttons to toggle between 'dEF-Y' (restore) and 'dEF-N' (do not restore).
4. After selecting 'dEF-Y', press the toggle button (ℹ️) to confirm. The display will show 'dEF-0' briefly before automatically restoring the factory defaults. The display will then exit to the setting interface.

[Description of restore factory settings interface showing 'dEF-n', 'dEF-Y', 'dEF-0']

7.2 Trip Odometer Reset Operation

The display records trip odometer and odometer. The trip odometer does not reset automatically after turning off and needs manual reset.

1. Enter the main setting interface and ensure the speed is 0.
2. Press and hold the minus button (➖) and the toggle button (ℹ️) simultaneously for 2 seconds to reset the trip odometer. The main interface will flash during the reset process.

[Description of trip odometer reset interface showing initial state and reset state]

8. Quality Assurance and Warranty

8.1 Warranty Info

Yolin offers a limited warranty for product defects under normal use during the warranty period. The product is warranted for 12 months from the date of factory shipment.

8.2 Warranty Does Not Cover

• The shell being opened.
• Damaged connectors.
• Scratches on the appearance after leaving the factory.
• Scratched or broken wires.
• Failure or damage caused by force majeure (e.g., fire, earthquake) or natural disasters (e.g., lightning strike).
• Issues arising outside the warranty period.

9. Wire Connection Diagram

9.1 Standard Wire Connection Sequence

The display connects to the controller via a multi-pin connector. The manual illustrates the controller connector and display connectors (female and male terminals), showing pin assignments.

Wire Connection Table:

Note: Some models may have waterproof connectors where internal wire colors are not visible.

10. Precautions

• Pay attention to general operating procedures when using the product. Do not plug or unplug the display while it is powered on.
• Avoid bumping the display to prevent damage.
• Do not change parameter settings arbitrarily, as this may affect normal riding performance.
• If the display malfunctions, send it to an authorized repair center as soon as possible.
• Minor differences may exist between physical products and this manual due to normal upgrades. Refer to the physical products for the most accurate information.

Schedule 1: Error Code Definition

YL-01, YL-02 Error Codes

YL-05, KDS, YL-J Error Codes

Schedule 2: Error Code Definition

Customize YL-02 (LKLS) Error Codes: