Yolin YL81F Electric Bike Display User's Manual

Product Name and Model Number

Smart LCD display for electric bicycle; Model: YL81F.

Specification

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

Appearance and Size

The YL81F display is a rectangular LCD unit. The control unit features buttons for operation. Dimensions: Front view shows 86.0mm width and 59.5mm height. Side view shows 71.2mm depth, with a handlebar mounting diameter of Ø31.8mm.

Function Overview and Functional Areas

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 (current speed, maximum speed, average speed)
• Mileage display (single and total mileage)
• Walk boost mode
• Light ON/OFF
• Error code indicator
• Motor power indicator (optional)
• USB connection indicator (optional)
• Cruise control indicator (optional)
• Bluetooth connection indicator (optional)
• Personalized parameter settings (e.g., wheel diameter, speed limit, battery power setting, PAS parameter setting, password setting, controller current limit setting, etc.)
• Factory default parameter recovery function

Functional Areas

The display interface shows various information:

• Battery level
• Error code
• Current speed
• Light ON/OFF
• Bluetooth
• USB
• Speed unit (KM/H, MPH)
• Walk boost mode
• Trip odometer
• Odometer
• Max speed
• Average speed
• Cruise control status
• PAS level
• Value and unit indicators

Button Definitions

The YL81F display is equipped with operating buttons: power/toggle [i], plus [+], minus [−], and light [?].

Routine Operation

Power on/off

Long press [i] to power on/off the display. When off, it consumes less than 1uA leakage current. The display automatically shuts off after 10 minutes of inactivity.

Display Interface Switching

The default display shows Current Speed and Trip Odometer. Short press [i] to cycle through Trip Odometer, Odometer, Maximum Speed, and Average Speed.

Walk Boost Mode

Long press [−] to enter walk boost mode. The e-bike moves at a fixed 6 km/h. Release [−] to stop. This mode is for pushing the bike, not riding.

Turning on/off Lights

Press [?] to turn on lights and dim the display backlight. Press [?] again to turn off lights and restore brightness.

PAS Level Selection

Press [+] or [−] to switch Pedal Assist System (PAS) levels, adjusting motor output power. Available PAS level settings include 0~3, 1~3, 0~5, 1~5, 1~7, 0~7, 0~9, 1~9.

Battery Level Display

Battery level is shown as 5 bars. All bars are lit when full. A flashing bar indicates low battery and the need to charge.

Error Code Display

If a fault occurs, an error code is displayed. Refer to Schedule 1 and 2 for definitions.

Personalized Parameter Settings

Settings require the bicycle to be stationary.

Procedure:

1. Press and hold [i], [+], and [−] simultaneously for over 2 seconds to enter the parameter setting interface.
2. Press [i] to toggle between settings; press [+] or [−] to enter parameter changing state.
3. Press [+] or [−] to select parameter value; long press [+] for addition, long press [−] for subtraction.
4. Press [i] to save settings and return to the parameter interface.
5. Long press [i] to save settings and exit.

Backlight Luminance Setting (01P)

Sets backlight brightness: 01 (minimum), 02 (standard), 03 (maximum). Press [i] to enter, [+] or [−] to select, [i] to save.

Metric and Imperial Setting (02P)

Sets units: 00 (metric), 01 (imperial). Press [i] to enter, [+] or [−] to select, [i] to save.

Rated Voltage Setting (03P)

Sets rated voltage: 24V, 36V, 48V. Press [i] to enter, [+] or [−] to select, [i] to save.

Auto Sleep Time Setting (04P)

Sets auto-off time: 1-60min, 00 (no auto-off). Default is 10 minutes. Press [i] to enter, [+] or [−] to select, [i] to save.

PAS Level Setting (05P)

Sets PAS levels. Available ranges: 0~3, 1~3, 0~5, 1~5, 1~7, 0~7, 0~9, 1~9. Press [i] to enter, [+] or [−] to select, [i] to save.

Wheel Diameter Setting (06P)

Sets wheel diameter: 1-50 inch. Press [i] to enter, [+] or [−] to select, [i] to save.

Number of Speed Sensor Magnets Setting (07P)

Sets sensor magnet count: 1-255 pcs. Press [i] to enter, [+] or [−] to select, [i] to save.

Speed Limit Setting (08P)

Sets speed limit: 1-100 km/h. Press [i] to enter, [+] or [−] to select, [i] to save.

Start-up Setting (09P)

Sets start mode: 00 (zero start), 01 (non-zero start). Press [i] to enter, [+] or [−] to select, [i] to save.

Drive Mode Setting (10P)

Sets drive mode: 00 (Pedal assist only), 01 (Electric only), 02 (Both). Press [i] to enter, [+] or [−] to select, [i] to save.

Pedal Assist Sensitivity Setting (11P)

Sets pedal assist sensitivity: 1-24. Higher numbers require more crank rotations. Press [i] to enter, [+] or [−] to select, [i] to save.

Pedal Assist Strength Setting (12P)

Sets pedal assist strength: 0-5 (0 weakest, 5 strongest). Press [i] to enter, [+] or [−] to select, [i] to save.

Number of Pedal Assist Sensor Magnets Setting (13P)

Sets pedal assist sensor magnet count: 5, 8, 12 pcs. Press [i] to enter, [+] or [−] to select, [i] to save.

Controller Current Limit Setting (14P)

Sets controller current limit: 1-50A. Press [i] to enter, [+] or [−] to select, [i] to save.

Battery Under Voltage Value Setting (15P)

Sets battery under-voltage threshold based on rated voltage. Press [i] to enter, [+] or [−] to select, [i] to save.

ODO Resets Setting (16P)

Sets ODO reset behavior: 00 (non-reset), 01 (reset). Press [i] to enter, [+] or [−] to select, [i] to save.

Controller Cruise Control Setting (17P)

Sets cruise control: 00 (disable), 01 (enable). Press [i] to enter, [+] or [−] to select, [i] to save.

6km/h Walk Boost Setting (18P)

Sets 6km/h walk boost function: 00 (turn off), 01 (turn on). Press [i] to enter, [+] or [−] to select, [i] to save.

Shortcut Operation

Restore Factory Settings Operation

To restore factory defaults: enter the main setting interface, keep speed at 0, and press and hold [i], [+], and [−] simultaneously for 2s. Press [i] to toggle between dEF-Y (restore) and dEF-N (no restore). Press [i] to confirm. The display shows dEF-0 then restores.

Trip Odometer Reset Operation

The trip odometer is not auto-reset. To reset, enter the main setting interface, keep speed at 0, and press and hold [−] and [i] simultaneously for 2s. The interface flashes during reset.

Quality Assurance and Warranty

Warranty Info

Yolin offers a limited warranty for product defects under normal use for 12 months from the date of factory.

Warranty Does Not Cover

• Opened shell
• Damaged connector
• Appearance scratches after factory
• Scratched or broken wires
• Force majeure or natural disaster damage
• Out of warranty period

Wire Connection Diagram

Standard Wire Connection Sequence

Description of controller connector, female display connector, and male display connector.

Note: Some models have waterproof connectors where internal wires are not visible.

Precautions

• Do not plug/unplug while powered on.
• Avoid bumping the display.
• Do not change parameters arbitrarily.
• Send for repair if the display does not work properly.
• Refer to physical products for potential differences due to upgrades.

Error Code Definition

Schedule 1: Error Code Definition (YL-01, YL-02)

Schedule 1: Error Code Definition (YL-05, KDS, YL-J)

Schedule 2: Error Code Definition (Customize YL-02 (LKLS))