User Manual for E-bike Display YL81C

Table of Contents

1. Function overview and functional area layout
   1. Function overview
   2. Functional area layout
   3. Button definitions
2. General operation
   1. Power on/off
   2. Display interface
   3. Push assistance
   4. Assist level selection
   5. Battery level indicator
   6. Error code indicator
3. General setting
   1. Trip distance reset
   2. Factory reset
4. Custom setting
   1. Rated voltage setting
   2. Wheel diameter setting
   3. Speed limit setting
   4. Metric/imperial system setting
   5. Speed sensor setting
   6. Current limit setting
   7. Assistance sensor setting
   8. Power-on password setting
5. Considerations

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 indicators:

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

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

Press and hold the [⌚] button to turn on the display and the controller's power supply. Press and hold the [⌚] button again to turn off the e-bike. When the display is off, it will not draw battery power, with a leakage current of less than 1uA. If the e-bike is not used for more than 10 minutes, the display will automatically power off.

2.2 Display interface

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

Figure 2-1: Display Interface Switching

2.3 Push assistance

Press and hold the [-] button to enable the electric push assistance mode. The e-bike will run at a constant speed of 6km/h, and the display will show 'P'. Releasing the [-] button will stop the power output and return to the previous state.

Figure 2-2: Push Assistance Indicator Interface

2.4 Assist level selection

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

Figure 2-3: Assist Level Switching Interface

2.5 Battery level indicator

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

Figure 2-4: Battery Level Indicator Interface

2.6 Error code indicator

When a fault occurs in the e-bike's electronic control system, an error code will be displayed in the distance area in the format of E0**. Detailed definitions of error codes are provided in Schedule 1.

Figure 2-5: Error Code Indicator Interface

If an error code appears, troubleshoot promptly to ensure normal e-bike operation.

3. General setting

All parameters can only be set when the e-bike is stopped. The display must show 0 speed in the power-on state.

3.1 Trip distance reset

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

3.2 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 [⌚] and [+] buttons simultaneously for more than 2 seconds to enter the factory reset interface. Press the [+] button to select a parameter.

Figure 3-1: Factory Reset Interface

4. Custom setting

All parameters can only be set when the e-bike is stopped. The display must show 0 speed in the power-on state.

Steps for custom setting:

1. Press and hold the [⌚] and [-] buttons simultaneously for more than 2 seconds to enter the custom setting options interface.
2. Press the [+] button to switch to the general setting options interface, 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 custom setting options interface.
5. Press and hold the [⌚] button to save the parameter and exit the custom setting interface.

4.1 Rated voltage setting

'P1' refers to the rated voltage setting. Available values: 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 general setting options interface.

Figure 4-1: Rated Voltage Setting Interface

4.2 Wheel diameter setting

'P2' refers to the wheel diameter setting. Available parameters: 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 general setting options interface.

Figure 4-2: Wheel Diameter Setting Interface

4.3 Speed limit setting

'P3' represents the speed limit setting. 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 general setting options interface.

Figure 4-3: Speed Limit Setting Interface

4.4 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 [⌚] button to enter the parameter modification interface. Press the [-] button for parameter selection. Press the [⌚] button to save the parameter and return to the general setting options interface.

Figure 4-4: Metric/Imperial System Setting Interface

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

Figure 4-5: Speed Sensor Setting Interface

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 general setting options interface.

Figure 4-6: Current Limit Setting Interface

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

Figure 4-7: Assistance Sensor Setting Interface

4.8 Power-on password setting

'P8' refers to the power-on password setting. 'PSd-Y' means a power-on password is required, and 'PSd-N' means no power-on password is required. The default value 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 custom setting options interface.
• If 'PSd-Y' is selected, press the [⌚] button to enter the password setting interface. To exit without changing the password, press and hold the [⌚] button. To change the password, press the [+] button for cursor movement and the [+] button for figure selection, then press the [⌚] button to return to the custom setting options interface.

Figure 4-8: Power-on Password Setting Interface

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, the displayed contents or functions may differ from this manual, depending on the actual model.

Schedule 1 Error Code Definitions