M20 User Manual for YL81C Display

1. Function Overview and Functional Area Layout

1.1 Function Overview

Display M20 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

1.2 Functional Area Layout

Description of the display layout: The central area shows a large number for speed (e.g., "25 km/h"). Below this, the PAS (Pedal Assist System) level is shown (e.g., "3"). The top bar displays a battery indicator with multiple segments. Various smaller icons and indicators surround the main display:

• Top Left: Battery level indicator (multiple segments representing charge).
• Bottom Left: Speed indicator (e.g., "25 km/h"). Below this, indicators for MAXS (Maximum Speed) and AVG (Average Speed) are shown with their respective values (e.g., "26.0 km/h" for MAXS, "25.8 km/h" for AVG). Also, indicators for TRIP (Trip Distance) and ODO (Odometer) are present with their values (e.g., "88.8 km" for TRIP, "888.8 km" for ODO).
• Top Right: Bluetooth indicator (icon), Headlight indicator (icon).
• Middle Right: Speed unit (Metric system: km/h, Imperial system: MPH).
• Bottom Right: Average speed indicator (value), Distance/speed unit (Metric system: km, km/h; Imperial system: mile, mph).

1.3 Button Definitions

There are three buttons on the operating unit of display M20: the on/off button [power-symbol], the plus button [plus-symbol], and the minus button [minus-symbol].

2. General Operation

2.1 Power On/Off

By pressing and holding the [power-symbol], the display will start to work and the controller's power supply will be turned on. In the power-on state, by pressing and holding the [power-symbol], your e-bike will be powered off. In the power-off state, the display will no longer use 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.

2.2 Display Interface

After the display is turned on, it will show the real-time speed (km/h) and the trip distance (km) by default. By pressing the [power-symbol], the information displayed will be switched between trip distance (km), ODO (km), maximum speed (km), and average speed (km).

When the distance reaches 9999.9 km, it will be automatically reset to zero.

Description of Display Interface Switching: The display cycles through different views.

• Initial View: Shows real-time speed (e.g., "25 km/h") and Trip distance (e.g., "88.8 km").
• Switch to ODO: Shows real-time speed (e.g., "25 km/h") and ODO (e.g., "888.8 km").
• Switch to Average Speed: Shows real-time speed (e.g., "25 km/h") and Average Speed (e.g., "25.8 km/h").
• Switch to Maximum Speed: Shows real-time speed (e.g., "25 km/h") and Maximum Speed (e.g., "26.0 km/h").

2.3 Push Assistance

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

Description of Push Assistance Indicator Interface: The display shows the PAS level (e.g., "3") and a "P" indicator, signifying push assistance mode.

2.4 Assist Level Selection

By pressing the [plus-symbol] or [minus-symbol], 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.

Description of Assist Level Switching Interface: The display shows the PAS level (e.g., "3") indicating the current motor assist level.

2.5 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.

Description of Battery Level Indicator Interface: Illustrates five states of the battery indicator: Full (all 5 segments lit), 4-segment, 3-segment, 2-segment, 1-segment. Also shows "Undervoltage flashing" where the battery outline flashes.

2.6 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.

Description of Error Code Indicator Interface: Displays an error code in the distance area, for example, "E002".

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

3. General Setting

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

3.1 Trip Distance Reset

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

3.2 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 [power-symbol] and [plus-symbol] buttons at the same time for more than 2 seconds to enter the factory reset interface, and press the [plus-symbol] or [minus-symbol] to select a parameter.

Description of Factory Reset Interface: The display shows "dEF-n" indicating no factory reset, or "dEF-y" for factory reset. Buttons are used to navigate and select.

4. Custom Setting

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

1. Press and hold the [power-symbol] and [minus-symbol] buttons at the same time for more than 2 seconds to enter the selection interface of custom setting options.
2. Press the [plus-symbol] or [minus-symbol] to switch the selection interface of general setting options, and press the [power-symbol] to enter the parameter modification interface.
3. Press the [plus-symbol] or [minus-symbol] for parameter selection.
4. Press the [power-symbol] to save the parameter and return to the selection interface of custom setting options.
5. Press and hold the [power-symbol] to save the parameter and exit the selection interface of custom setting options.

4.1 Rated Voltage Setting

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

Description of Rated Voltage Setting Interface: The display shows "P1" and the selected rated voltage (e.g., "36V").

4.2 Wheel Diameter Setting

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

Description of Wheel Diameter Setting Interface: The display shows "P2" and the selected wheel diameter in inches (e.g., "20 in").

4.3 Speed Limit Setting

P3 represents the speed limit setting option. The adjustable range is 10~60km/h. Press the [power-symbol] to enter the parameter modification interface. Press the [plus-symbol] or [minus-symbol] for parameter selection. Press the [power-symbol] to save the parameter and return to the selection interface of general setting options.

Description of Speed Limit Setting Interface: The display shows "P3" and the current speed limit setting (e.g., "25 Km/h").

4.4 Metric/Imperial System Setting

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

Description of Metric/Imperial System Setting Interface: Shows two states: "P4" with "00" for Metric system (km/h) and "P4" with "01" for Imperial system (MPH).

4.5 Speed Sensor Setting

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] to enter the parameter modification interface. Press the [plus-symbol] or [minus-symbol] for parameter selection. Press the [power-symbol] to save the parameter and return to the selection interface of general setting options.

Description of Speed Sensor Setting Interface: The display shows "P5" and the selected speed sensor value (e.g., "01").

4.6 Current Limit Setting

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

Description of Current Limit Setting Interface: The display shows "P6" and the selected current limit (e.g., "13" A).

4.7 Assistance Sensor Setting

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] to enter the parameter modification interface. Press the [plus-symbol] or [minus-symbol] for parameter selection. Press the [power-symbol] to save the parameter and return to the selection interface of general setting options.

Description of Assistance Sensor Setting Interface: The display shows "P7" and the selected number of magnets (e.g., "12").

4.8 Power-on Password Setting

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] to enter the modification interface, and press the [plus-symbol] or [minus-symbol] to enter the selection interface.

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

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

Description of Power-on Password Setting Interface: The display shows "P8" and the password setting status, either "PSd-n" (no password) or "PSd-Y" (password required).

5. 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 of the Company, part of the displayed contents or functions of product you bought may be different from the manual, depending on the actual model.

Schedule 1 Error Code Definitions