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

The display interface includes the following areas:

• Bluetooth indicator
• Battery level indicator
• Speed indicator
• Assist level indicator
• Maximum speed
• Trip distance 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, MPH)

Figure 1-1 Functional Area Layout Interface of Display M20

1.3 Button Definitions

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

2. General Operation

2.1 Power On/Off

By pressing and holding the on/off 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 on/off 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.

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 button [-], the information displayed will be switched between the 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.

Figure 2-1 Display Interface Switching shows the sequence of display changes between Trip distance, ODO, Maximum speed, and Average speed indicators.

2.3 Push Assistance

By pressing and holding the button [-], 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 button [-], your e-bike will immediately stop power output and return to the state before push assistance.

Figure 2-2 Push Assistance Indicator Interface shows the 'P' indicator for push assistance.

2.4 Assist Level Selection

By pressing the button [+] or [-], 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.

Figure 2-3 Assist Level Switching Interface shows the assist level indicator changing.

2.5 Battery Level Indicator

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

Figure 2-4 Battery Level Indicator Interface shows different battery level indications: Full battery level, 4-segment indication, 3-segment indication, 2-segment indication, 1-segment indication, and Undervoltage flashing.

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.

Figure 2-5 Error Code Indicator Interface shows an example error code '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 buttons [▶️] and [-] 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 buttons [▶️] and [+] at the same time for more than 2 seconds to enter the factory reset interface, and press the button [+] to select a parameter.

Figure 3-1 Factory Reset Interface shows the 'dEF-n' option for factory reset.

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 buttons [+] and [-] at the same time for more than 2 seconds to enter the selection interface of custom setting options.
2. Press the button [+] to switch the selection interface of general setting options, and press the button [▶️] to enter the parameter modification interface.
3. Press the button [+] for parameter selection.
4. Press the button [▶️] to save the parameter and return to the selection interface of custom setting options.
5. Press and hold the button [▶️] 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 button [▶️] to enter the parameter modification interface. Press the button [+] for parameter selection. Press the button [▶️] to save the parameter and return to the selection interface of general setting options.

Figure 4-1 Rated Voltage Setting Interface shows the voltage setting, e.g., '36 V'.

4.2 Wheel Diameter Setting

P2 refers to the wheel diameter setting option. Available parameters include: 8-32 inches. Press the button [▶️] to enter the parameter modification interface. Press the button [+] for parameter selection. Press the button [▶️] to save the parameter and return to the selection interface of general setting options.

Figure 4-2 Wheel Diameter Setting Interface shows the wheel diameter setting, 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 button [▶️] to enter the parameter modification interface. Press the button [-] for parameter selection. Press the button [▶️] to save the parameter and return to the selection interface of general setting options.

Figure 4-3 Speed Limit Setting Interface shows the 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 button [▶️] to enter the parameter modification interface. Press the button [-] for parameter selection. Press the button [▶️] to save the parameter and return to the selection interface of general setting options.

Figure 4-4 Metric/Imperial System Setting Interface shows both the metric system indicator ('00') and the imperial system indicator ('0').

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

Figure 4-5 Speed Sensor Setting Interface shows the speed sensor setting, e.g., '01'.

4.6 Current Limit Setting

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

Figure 4-6 Current Limit Setting Interface shows the current limit setting, e.g., '13'.

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

Figure 4-7 Assistance Sensor Setting Interface shows the assistance sensor setting, 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 button [▶️] to enter the modification interface, and press the button [+] to enter the selection interface.

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

Figure 4-8 Power-on Password Setting Interface shows the power-on password setting, e.g., 'PSd-n'.

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