ENGWE YL81C-B E-bike Display User Manual

4.1 Function Overview

Display YL81C 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

A detailed diagram of the YL81C display interface. It illustrates various functional areas including battery level indicator, speed indicator, assist level indicator, maximum speed, trip distance indicator (TRIP, ODO), average speed indicator (AVG), Bluetooth indicator, headlight indicator, and speed unit selectors (km/h, MPH).

4.3 Button Definitions

There are three buttons on the operating unit of display YL81C: the on/off button [power symbol] ?, the plus button [plus symbol] ➕, and the minus button [minus symbol] ➖.

5.1 Power On/Off

By pressing and holding the [power symbol] ? button, the display will start to work and the working power supply of the controller will be turned on. In the power-on state, by pressing and holding the [power symbol] ? button, your e-bike will be powered off. In the power-off state, the display will no longer use the battery power, and its leakage current will be less than 1uA. If your e-bike is not used for more than 10 minutes, the display will be automatically powered off.

5.2 Display Interface

After the display is turned on, the display will show the real-time speed (km/h) and the trip distance (km) by default. By pressing the [mode button], the information displayed will be switched between the trip distance (km), ODO (km), maximum speed (km/h) and average speed (km/h). When the distance reaches 9999.9 km, it will be automatically reset to zero.

Illustrations showing display interface switching between Trip distance, ODO, Average speed, and Maximum speed indicators.

5.3 Push Assistance

By pressing and holding the [minus symbol] ➖ button, the electric push assistance mode will be enabled. Your e-bike will run at the constant speed of 6km/h. The display will show level P. By releasing the [minus symbol] ➖ button, your e-bike will immediately stop power output and return to the state before push assistance.

Illustration of the YL81C display interface showing the 'PAS P' indicator, signifying the push assistance mode is active.

5.4 Headlight On/Off

By pressing and holding the [plus symbol] ➕ button, the controller will turn on the headlights and the display backlight will turn dark. By pressing and holding the [plus symbol] ➕ button again, the controller will turn off the headlights and the display backlight will resume the luminance.

Illustration of the YL81C display interface with a headlight indicator illuminated, indicating the headlights are on.

5.5 Assist Level Selection

By pressing the [plus symbol] ➕ or [minus symbol] ➖ buttons, the e-bike assist level will be switched to change the motor output power. The assist levels available for the display include: levels 0-3, levels 1-3, levels 0-5, levels 1-5, levels 0-7, levels 1-7, levels 0-9 and levels 1-9.

Illustration of the YL81C display interface showing the current PAS level, e.g., '3'.

5.6 Battery Level Indicator

The battery level indicator consists of five segments. When the battery is fully charged, the five segments will be all on. In case of undervoltage, the outline of the battery indicator will flash, which means the battery has to be charged immediately.

Visual representations of the battery level indicator on the YL81C display, showing five segments for full charge, progressively fewer segments for lower charge, and a flashing outline for undervoltage.

5.7 Error Code Indicator

When a fault occurs in the electronic control system of your e-bike, the display will automatically indicate the error code in the distance area in the format of E0**. Detailed definitions of error codes are shown in Schedule 1.

Illustration of the YL81C display interface showing an error code, such as 'E002'.

When an error code appears on the display interface, please conduct troubleshooting in time. Otherwise, your e-bike will not work normally.

6.1 Trip Distance Reset

Press and hold the [plus symbol] ➕ and [minus symbol] ➖ buttons at the same time for more than 2 seconds to reset the trip distance.

6.2 Factory Reset

dEF refers to factory reset. dEF-n represents not to restore factory settings, and dEF-y represents to restore factory settings. Press and hold the [plus symbol] ➕ and [minus symbol] ➖ buttons at the same time for more than 2 seconds to enter the factory reset interface, and press the [minus symbol] ➖ button to select a parameter.

Illustration of the YL81C display interface for factory reset options, showing 'dEF-n' (no reset) or 'dEF-y' (restore settings).

7.1 Rated Voltage Setting (P1)

P1 refers to the rated voltage setting option. Available values include: 36V and 48V. Press the [power symbol] ? button to enter the parameter modification interface. Press the [plus symbol] ➕ / [minus symbol] ➖ buttons for parameter selection. Press the [power symbol] ? button to save the parameter and return to the selection interface of general setting options.

Illustration of the YL81C display interface for setting the rated voltage (P1), showing options like '36 V'.

7.2 Wheel Diameter Setting (P2)

P2 refers to the wheel diameter setting option. Available parameters include: 8-32 inches. Press the [power symbol] ? button to enter the parameter modification interface. Press the [plus symbol] ➕ / [minus symbol] ➖ buttons for parameter selection. Press the [power symbol] ? button to save the parameter and return to the selection interface of general setting options.

Illustration of the YL81C display interface for setting the wheel diameter (P2), showing a value in inches (e.g., '20 in').

7.3 Speed Limit Setting (P3)

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

Illustration of the YL81C display interface for setting the speed limit (P3), showing a value in km/h (e.g., '25 Km/h').

7.4 Metric/Imperial System Setting (P4)

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

Illustrations of the YL81C display interface for setting the metric/imperial system (P4), showing '00' for metric and '01' for imperial.

7.5 Speed Sensor Setting (P5)

P5 refers to the speed sensor setting option, which can be set according to the number of magnetic heads installed on the wheels of your e-bike. The setting range is 1-63. Press the [power symbol] ? button to enter the parameter modification interface. Press the [plus symbol] ➕ / [minus symbol] ➖ buttons for parameter selection. Press the [power symbol] ? button to save the parameter and return to the selection interface of general setting options.

Illustration of the YL81C display interface for setting the speed sensor (P5), showing a numerical value.

7.6 Current Limit Setting (P6)

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

Illustration of the YL81C display interface for setting the current limit (P6), showing a value in Amperes (A).

7.7 Assistance Sensor Setting (P7)

P7 refers to the assistance sensor setting option, 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 symbol] ? button to enter the parameter modification interface. Press the [plus symbol] ➕ / [minus symbol] ➖ buttons for parameter selection. Press the [power symbol] ? button to save the parameter and return to the selection interface of general setting options.

Illustration of the YL81C display interface for setting the assistance sensor (P7), showing a numerical value representing the number of magnets.

7.8 Power-on Password Setting (P8)

P8 refers to the power-on password setting option. PSd-Y means that a power-on password is required, and PSd-N means that no power-on passwords are required. The default value of the display is PSd-N. Press the [power symbol] ? button to enter the modification interface, and press the [plus symbol] ➕ / [minus symbol] ➖ buttons to enter the selection interface.

If PSd-N is selected, press the [power symbol] ? button to return to the selection interface of custom setting options;

If PSd-Y is selected, press the [power symbol] ? button to enter the password setting interface. If you don't want to change the password, press and hold the [power symbol] ? button to exit the custom setting interface. If you want to change the password, press the [power symbol] ? button for cursor movement and the [plus symbol] ➕ / [minus symbol] ➖ buttons for figure selection, and then press the [power symbol] ? button to return to the selection interface of custom setting options.

Illustration of the YL81C display interface for setting the power-on password (P8), showing 'PSd-n' (password not required) or 'PSd-Y' (password required).

8.1 Warranty Information

For the faults caused by the quality of the product under normal use, the Company will be responsible for providing limited warranty during the warranty period. The warranty period of the product is within 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 (such as fires, earthquakes, etc.) or natural disasters (such as lightning strikes, etc.)
• The warranty period has expired

9.1 Wiring Sequence of Standard Connector

Diagrams illustrating the wiring sequence of the standard connector for the e-bike display. It shows the connecting terminal to the controller, the leading-out terminal of the display, and the connecting terminal itself, with pin numbers (1-5) and orientation guides (Projection, Groove).

The outgoing lines of some products adopt waterproof connectors, and users cannot see the outgoing line color inside the wire harnesses.