Electric Bike Display User's Manual

1. Product Name and Model Number

Smart LCD display for electric bicycle; Model: YL81F.

2. 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

3. Appearance and Size

The YL81F display features a clear LCD screen showing various riding metrics. It is designed to be mounted on an electric bicycle handlebar.

Physical Picture of the YL81F display: [Image of YL81F display showing speed, PAS level, battery, ODO, TRIP, etc.]

Physical picture of the K5 control button: [Image of K5 control button]

Physical picture of the K6 control button: [Image of K6 control button]

Dimensions:

• Front View: 59.5mm width, 86.0mm height
• Side View: 71.2mm depth, fits a handlebar diameter of 31.8mm

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 (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 and PAS parameter setting, password setting, controller current limit setting, etc.).
• Factory default parameter recovery function

4.2 Functional areas

The display interface includes indicators for:

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

YL90T-V functional area distribution interface: [Image illustrating the functional areas of the display]

4.3 Button definitions

The YL81F display is equipped with five buttons on the corresponding operating unit: power on/off [power-symbol], plus [+], minus [-], light [light-symbol], and toggle [info-symbol].

5. Routine operation

5.1 Power on/off

Long press the [power-symbol] to power on/off the display. When the display is off, it will not use the battery power and the leakage current is less than 1uA. The display will automatically shut off if it is not used for more than 10 minutes.

5.2 Display interface switching

When the display is powered on, it will show the Current Speed (km/h) and Trip Odometer (km) by default. Short press the [info-symbol] to switch between Trip Odometer (km), Odometer (km), Maximum Speed (km/h), and Average Speed (km/h).

Display Interface Switching: [Image sequence showing switching between Trip Odometer, Odometer, Average Speed, and Maximum Speed]

5.3 Walk boost mode

Long press and hold the [power-symbol] and [minus-symbol], the electric bicycle enters the walk boost mode. The electric bicycle will walk at a fixed speed of 6 km per hour and the display shows [walking-person-symbol]. Release the buttons to stop the power output immediately and restore to the state before walk boost.

Note: The walk boost mode can only be used when pushing the electric bicycle, please do not use it while riding.

5.4 Turning on/off lights

Press the [light-symbol] to make the controller turn on the lights and the display backlight becomes dim. Press again to make the controller turn off the lights and the backlight restore brightness.

Backlight display interface: [Image of backlight display interface]

5.5 PAS level selection

Press [+] or [-] to switch PAS level of electric bicycle, thus changing the motor output power.

PAS level display interface: [Image sequence showing PAS levels 1, 3, and 5]

5.6 Battery level display

The Battery level is shown as 5 bars. When the battery is full charged, all of the 5 bars lighten up. When the battery is fully depleted, the bar will begin to flash, warning the user to charge the battery as soon as possible.

Battery Level Display Interface: [Image sequence showing full power, four bars, three bars, two bars, one bar, and empty power flashing]

5.7 Error code display

If there is a fault occurs in the electronic system of the electric bicycle, the display will automatically show an error code. See Schedule 1 for a detailed definition of the error code.

Error Code Display: [Image of Error Code Display showing ERROR 30]

6. Personalized parameter settings

Note: Each setting needs to be done with the bicycle stationary.

The personalized parameter setting procedure is as follows:

1. When the display is ON and the speed shows 0, press and hold [power-symbol] and [info-symbol] simultaneously for more than 2 seconds to enter the personalized parameter setting interface.
2. Press [+] or [-] to toggle between the personalized parameter setting interface, and press [info-symbol] to enter the parameter changing state.
3. Press [+] or [-] to select the parameter, long press [+] for addition operation, long press [-] for subtraction operation.
4. Press [info-symbol] to save the parameter settings and return to the personalized parameter setting interface.
5. Long press [info-symbol] to save the parameter settings and exit the personalized parameter setting interface.

The following options are available on the personalized parameter setting interface:

6.1 Backlight luminance setting

01P is the backlight luminance setting. Parameters 01, 02 and 03 are available, which represent the backlight luminance, 01 for the minimum luminance, 02 for the standard luminance and 03 for the maximum luminance.

Press the button [info-symbol] to enter the parameter modification interface. Press the button [+] or [-] for parameter selection. Press the button [info-symbol] to save the parameter and return to the selection interface of general setting options.

Backlight Luminance Setting Interface: [Image of Backlight Luminance Setting Interface showing 01P]

6.2 Metric and Imperial setting

02P is the metric and imperial setting, 00 for metric and 01 for imperial.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Metric and Imperial Units Setting Interface: [Image showing 02P with km/h and mile/h options]

6.3 Rated voltage setting

03P is the rated voltage setting. The available rated voltage range is: 24V, 36V, 48V.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Rated voltage setting interface: [Image of Rated voltage setting interface showing 03P and 48V]

6.4 Auto Sleep Time Setting

04P is the auto sleep time setting. To save the battery power and reach higher range, this display will be turned off after it has not been used for a time. The adjustable range is: 1~60min, 00 means no auto shutdown. The factory default setting is 10 minutes.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Auto Power Off Time Setting Interface: [Image of Auto Power Off Time Setting Interface showing 04P and 10]

6.5 PAS level setting

05P is the Pedal assist level setting. The available PAS level settings are: 0~3, 1~3, 0~5, 1~5, 1~7, 0~7, 0~9, 1~9.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

PAS level setting interface: [Image of PAS level setting interface showing 05P and 0-5]

6.6 Wheel diameter setting

06P is the wheel diameter setting. The adjustable wheel diameter range is: 1~50inch.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Wheel diameter setting interface: [Image of Wheel diameter setting interface showing 06P and 26.0]

6.7 Number of speed sensor magnets setting

07P is the speed sensor magnet number setting. The adjustable speed sensor magnet number range is: 1 ~ 255 pcs.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Number of speed sensor magnets setting interface: [Image of Number of speed sensor magnets setting interface showing 07P and 12]

6.8 Speed Limit Setting

08P is the speed limit setting. The adjustable speed limit range is: 1~100km/h. (The maximum adjustable speed limit varies by different protocols).

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Speed limit setting interface: [Image of Speed limit setting interface showing 08P and 25 km/h]

6.9 Start-up setting

09P is the start-up setting. The display can choose the following start modes: 00→zero start, 01→non-zero start.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Start-up setting interface: [Image of Start-up setting interface showing 09P and 00]

6.10 Drive mode setting

10P is the drive mode setting. The available drive modes are: 00→Pedal assist only, 01→Electric only, 02→Both Pedal assist and electric.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Drive mode setting interface: [Image of Drive mode setting interface showing 10P and 02]

6.11 Pedal assist sensitivity setting

11P is the pedal assist sensitivity setting. When set to higher numbers, it will take more crank rotations to activate the motor. On lower numbers, it will take little crank rotation to activate the motor. The adjustable range is: 1~24.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Pedal assist sensitivity setting interface: [Image of Pedal assist sensitivity setting interface showing 11P and 02]

6.12 Pedal assist strength setting

12P is the Pedal assist strength setting. The Pedal assist strength is the relative strength of the PWM signal from the controller when start to activate pedal assist. The adjustable range is 0 ~ 5. 0 is the weakest strength and 5 is the strongest.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Pedal assist Start-up intensity setting interface: [Image of Pedal assist Start-up intensity setting interface showing 12P and 02]

6.13 Number of pedal assist sensor magnets setting

13P is the number of pedal assist sensor magnets setting. The adjustable range: 5, 8, 12 pcs.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Number of pedal assist sensor magnets setting interface: [Image of Number of pedal assist sensor magnets setting interface showing 13P and 12]

6.14 Controller Current Limit Setting

14P is the controller current limit setting. The adjustable range is: 1~50A.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Controller current limit setting interface: [Image of Controller current limit setting interface showing 14P and 15]

6.15 Battery under voltage value setting

15P is the battery under voltage setting. The value can be adjusted based on the current rated voltage.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Battery under voltage value setting interface: [Image of Battery under voltage value setting interface showing 15P and 31.5V]

6.16 ODO resets setting

16P is the ODO resets setting. The display can choose the following: 00→non reset, 01→reset.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

ODO resets setting interface: [Image of ODO resets setting interface showing 16P and 01]

6.17 Controller cruise control setting

17P is the controller cruise control setting. The display can choose the following: 00→non enable, 01→enable.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

Controller cruise control setting interface: [Image of Controller cruise control setting interface showing 17P and 01]

6.18 6km/h walk boost setting

18P is the 6km/h walk boost setting. The display can choose the following: 00→turn off walk boost function, 01→turn on walk boost function.

Press [info-symbol] to enter the parameter changing state. Press the [+] or [-] to select the parameter and press [info-symbol] to save the parameter setting and return to the personalized parameter setting interface.

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

7. Shortcut operation

7.1 Restore factory settings operation

dEF is the restore factory default parameter settings. dEF-Y is to restore default settings, and dEF-N is not to restore.

Enter into the main setting interface and keep the speed at 0, press and hold [power-symbol] and [info-symbol] simultaneously for 2s to enter the restore factory default setting interface. Pressing [+] or [-] to toggle to dEF-Y. Then after pressing [info-symbol] to confirm, the display will show dEF-0 for a few seconds and then automatically start to restore the factory default settings. The display will automatically exit to setting interface after the restoration.

Restore Factory Default Settings Interface: [Image sequence showing dEF-0, dEF-Y, dEF-N]

7.2 Trip odometer reset operation

The display can record trip odometer and odometer. Trip odometer is not automatically reset after turning off. The trip odometer needs to be reset manually.

Enter into the main setting interface and keep the speed at 0, press and hold [power-symbol] and [info-symbol] simultaneously for 2s to reset the trip odometer. The main interface will flash during the reset process.

Trip Odometer Reset Interface: [Image sequence showing before and after trip odometer reset]

8. Quality Assurance and Warranty

8.1 Warranty info

Yolin will offer a limited warranty for any failure caused by the product defects under normal use during the warranty period.

The product is warranted for 12 months from the date out of factory.

8.2 Warranty does not cover

• The shell is opened.
• The connector is damaged.
• Scratches on the appearance after the product is out of factory.
• Scratched or broken wires
• Failure or damage caused by force majeure (e.g. fire, earthquake, etc.) or natural disaster (e.g. lightning strike, etc.)
• Out of warranty period.

9. Wire connection diagram

9.1 Standard wire connection sequence

Controller connector: [Image of controller connector with pins labeled 1-5]

Display connector (Female terminal): [Image of female display connector with pins labeled 1-5]

Display connector (Male terminal): [Image of male display connector with pins labeled 1-5]

Standard connector wire sequence table:

Note: Some models are equipped with waterproof connectors and the color inside wires can not be seen.

10. Precautions

Pay attention to all the general operating when using the products and do not plug and unplug the display while it is powered on.

• Avoid bumping the display as much as possible.
• Please do not change the parameter settings at will, otherwise normal riding cannot be guaranteed.
• If display does not work properly, please send it to the repair center as soon as possible.
• There may be differences between the physical products and this manual due to normal upgrade. Please refer to the physical products.

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: