Yolin E-bike Display User Manual

1. Product Name and Model

Intelligent LCD display for e-bike; model: YL81C.

2. Specifications

• Power supply: 36V/48V
• Rated working current: 15mA
• Maximum working current: 30mA
• Leakage current at power-off: <1uA
• Working current at the supply controller end: 50mA
• Working temperature: -20~60℃
• Storage temperature: -30~70℃

3. Appearance and Dimensions

A photograph shows the Yolin YL81C e-bike display unit mounted on handlebars.

A diagram illustrates the top view dimensions of the Yolin YL81C display, showing a width of 48.5mm and a diameter of Ø22.2mm for the mounting clamp.

A diagram shows the side view dimensions of the Yolin YL81C display, indicating a width of 70.0mm and a height of 37.0mm.

4. Function Overview and Functional Area Layout

4.1 Function Overview

The YL81C display provides a variety of functions to meet the riding needs of users, including:

• Battery level indicator
• Assist level adjustment and indication
• Headlight indicator
• Speed indicator (including real-time speed, maximum speed (MAXS) and average speed (AVG))
• Distance indicator (including ODO and trip distance (Trip))
• Error code indicator
• Bluetooth connection indicator (reserved)
• Parameter setting function

4.2 Functional Area Layout

The display interface includes the following elements:

• Battery level indicator
• Speed indicator
• Assist level indicator
• Maximum speed indicator
• Trip distance indicator (Trip/ODO)
• Bluetooth indicator
• Headlight indicator
• Speed unit: Metric system (km/h), Imperial system (MPH)
• Average speed indicator
• Distance/speed unit: Metric system (km, km/h), Imperial system (mile)

4.3 Button Definitions

There are three buttons on the operating unit of the display: the [power] button, the [plus] button, and the [minus] button.

5. General Operation

5.1 Power On/Off

Press and hold the [power] button to turn on the display and the controller's power supply. Press and hold the [power] button again to power off the e-bike. In the power-off state, the display consumes less than 1uA leakage current. If the e-bike is not used for more than 10 minutes, the display will automatically power off.

5.2 Display Interface

After turning on, the display shows real-time speed (km/h) and trip distance (km) by default. Pressing the [power] button cycles through Trip distance, ODO, maximum speed (km/h), and average speed (km/h). The distance resets to zero when it reaches 9999.9 km.

A sequence of four display interface screenshots shows the switching between Trip distance, ODO, Average speed, and Maximum speed indicators.

5.3 Push Assistance

By pressing and holding the [power] button, the electric push assistance mode is enabled, running the e-bike at a constant speed of 6km/h. The display shows level 'P'. Releasing the [power] button stops power output and returns to the previous state.

A diagram of the Yolin YL81C display interface shows the 'P' indicator for push assistance mode.

5.4 Headlight On/Off

Press and hold the [plus] button to turn on the headlights and dim the display backlight. Press and hold the [plus] button again to turn off the headlights and restore the display backlight luminance.

A diagram of the Yolin YL81C display interface shows the headlight indicator.

5.5 Assist Level Selection

Pressing the [plus] or [minus] buttons switches the e-bike assist level, changing motor output power. Available assist levels include: 0-3, 1-3, 0-5, 1-5, 0-7, 1-7, 0-9, and 1-9.

A diagram of the Yolin YL81C display interface shows the assist level selection, with the current level indicated as '3'.

5.6 Battery Level Indicator

The battery level indicator has five segments. All segments are lit when the battery is fully charged. In case of undervoltage, the indicator outline flashes, signaling the need for immediate charging.

Illustrations of the battery level indicator show five segments for full charge, progressively fewer segments for lower charge, and an undervoltage flashing outline.

5.7 Error Code Indicator

When a fault occurs in the e-bike's electronic control system, the display shows an error code in the distance area in the format E0**. Detailed definitions are in Schedule 1.

A diagram of the Yolin YL81C display interface shows an error code 'E002' in the distance area.

⚠️ When an error code appears, conduct troubleshooting promptly to ensure normal operation.

6. General Setting

All parameters can only be set when the e-bike is stopped. The steps for general setting are as follows: In the power-on state, when the display shows speed 0:

6.1 Trip Distance Reset

Press and hold the [power] and [minus] buttons simultaneously for more than 2 seconds to reset the trip distance.

6.2 Factory Reset

'dEF' refers to factory reset. 'dEF-n' means not to restore factory settings, and 'dEF-y' means to restore factory settings. Press and hold the [power] and [plus] buttons simultaneously for more than 2 seconds to enter the factory reset interface. Use the [plus] or [minus] buttons to select a parameter.

A diagram of the Yolin YL81C display interface for factory reset shows 'DEF-n' and 'DEF-y' options.

7. Custom Setting

All parameters can only be set when the e-bike is stopped. The steps for custom setting are as follows: In the power-on state, when the display shows speed 0:

1. Press and hold the [power] and [minus] buttons simultaneously for more than 2 seconds to enter the custom setting options interface.
2. Press the [plus] or [minus] button to switch between general setting options and press the [power] button to enter the parameter modification interface.
3. Press the [plus] or [minus] button for parameter selection.
4. Press the [power] button to save the parameter and return to the custom setting options interface.
5. Press and hold the [power] button to save the parameter and exit the custom setting interface.

7.1 Rated Voltage Setting

P1 refers to the rated voltage setting. Available values: 36V and 48V. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P1' setting for Rated Voltage, displaying '36V'.

7.2 Wheel Diameter Setting

P2 refers to the wheel diameter setting. Available parameters: 8-32 inches. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P2' setting for Wheel Diameter, displaying '20in'.

7.3 Speed Limit Setting

P3 represents the speed limit setting. The adjustable range is 10~40km/h. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P3' setting for Speed Limit, displaying '25 Km/h'.

7.4 Metric/Imperial System Setting

P4 refers to the metric/imperial system setting. 00 represents the metric system, and 01 represents the imperial system. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

Two diagrams of the Yolin YL81C display interface for Metric/Imperial System setting show '00' for Metric and '01' for Imperial.

7.5 Speed Sensor Setting

P5 refers to the speed sensor setting, which is set according to the number of magnetic heads on the e-bike's wheels. The setting range is 1-63. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P5' setting for Speed Sensor.

7.6 Current Limit Setting

P6 refers to current limit setting. The adjustable range is 1-25A. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P6' setting for Current Limit, displaying '13'.

7.7 Assistance Sensor Setting

P7 refers to the assistance sensor setting, where the number of steel magnets of the assistance magnetic disk can be set. The adjustable range is 5, 6, 7, 8, 9, 10, and 12. Press the [power] button to enter the parameter modification interface. Press the [plus] or [minus] button for parameter selection. Press the [power] button to save the parameter and return to the general setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P7' setting for Assistance Sensor, displaying '12'.

7.8 Power-on Password Setting

P8 refers to the power-on password setting option. 'PSd-Y' means a power-on password is required, and 'PSd-N' means no password is required. The default is 'PSd-N'. Press the [power] button to enter the modification interface, and press the [plus] or [minus] button to enter the selection interface.

If 'PSd-N' is selected, press the [power] button to return to the custom setting options interface. If 'PSd-Y' is selected, press the [power] button to enter the password setting interface. To exit without changing the password, press and hold the [power] button. To change the password, use the [plus]/[minus] buttons for cursor movement and the [plus]/[minus] buttons for figure selection, then press the [power] button to return to the custom setting options interface.

A diagram of the Yolin YL81C display interface shows the 'P8' setting for Power-on Password, displaying 'PSd-n'.

8. Quality Commitments and Warranty Scope

8.1 Warranty Information

For faults caused by product quality under normal use, the Company provides a limited warranty during the warranty period. The warranty period is 12 months from delivery.

8.2 Non-Warranty Scope

• The enclosure is opened.
• The connector is damaged.
• The enclosure is scratched or damaged after delivery.
• The outgoing line of the display is scratched or broken.
• Faults or damage caused by force majeure (e.g., fires, earthquakes) or natural disasters (e.g., lightning strikes).
• The warranty period has expired.

9. Outgoing Line Connection Diagram

9.1 Wiring Sequence of Standard Connector

Three images show the wiring connections: the connecting terminal to the controller, the leading-out terminal of the display, and a connecting terminal with a groove.

Note: The outgoing lines of some products use waterproof connectors, and users cannot see the wire colors inside the harnesses.

10. Considerations

• Please use safely, and do not plug or unplug the display when it is powered on.
• Please avoid bumping as far as possible.
• Please do not alter the background parameter settings of the display at will, otherwise normal riding cannot be guaranteed.
• If the display fails to work normally, it should be repaired as soon as possible.
• Due to product upgrades, the displayed contents or functions may differ from the manual depending on the actual model.

Schedule 1: Error Code Definitions

Error Codes for Protocols YL-01 and YL-02

Error Codes for Protocols YL-05, KDS and YL-J

Contact Information

Tel: 022-86838795

Fax: 022-86838795

Email: yolin@yolintech.com

Website: www.yolintech.com

Address: Plant 52-1, Yougu Xinke Park, East of Jingfu Road, Pharmaceuticals and Medical Equipment Industrial Park, Beichen Economic Development Zone, Beichen District, Tianjin