Yolin YL81C-B User manual

Tianjin Yolin Technology Co., Ltd.
User Manual for
E-bike Display
Model YL81C-B

Table of Contents
1.Product name and model................................................................................................................................................................. 1
2. Specifications...............................................................................................................................................................................1
3.Appearance and dimensions............................................................................................................................................................1
4. Function overview and functional area layout............................................................................................................................ 2
4.1 Function overview.................................................................................................................................................................... 2
4.2 Functional area layout............................................................................................................................................................. 2
4.3 Button definitions.....................................................................................................................................................................2
5. General operation ......................................................................................................................................................................... 2
5.1 Power on/off.......................................................................................................................................................................2
5.2 Display interface.......................................................................................................................................................................2
5.3 Push assistance.......................................................................................................................................................................3
5.4 Headlight on/off.......................................................................................................................................................................3
5.5 Assist level selection................................................................................................................................................................. 4
5.6 Battery level indicator............................................................................................................................................................. 4
5.7 Error code indicator................................................................................................................................................................ 4
6. General setting...............................................................................................................................................................................5
6.1 Trip distance reset.................................................................................................................................................................... 5
6.2 Factory reset.......................................................................................................................................................................5
7. Custom setting...............................................................................................................................................................................5
7.1 Rated voltage setting................................................................................................................................................................5
7.2 Wheel diameter setting............................................................................................................................................................ 6
7.3 Speed limit setting.................................................................................................................................................................... 6
7.4 Metric/imperial system setting................................................................................................................................................6
7.5 Speed sensor setting................................................................................................................................................................. 7
7.6 Current limit setting................................................................................................................................................................ 7
7.7 Assistance sensor setting.......................................................................................................................................................... 7
7.8 Power-on password setting......................................................................................................................................................8
8. Quality commitments and warranty scope.................................................................................................................................. 8
8.1 Warranty information:............................................................................................................................................................8
8.2 Non-warranty scope.................................................................................................................................................................8
9. Outgoing line connection diagram................................................................................................................................................9
9.1 Wiring sequence of standard connector.................................................................................................................................9
10. Considerations.............................................................................................................................................................................. 9

1
1. Product name and model
Intelligent LCD display for e-bike; model: YL81C.
2. Specifications
 36V/48V power supply
 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
Fig. 3-1 Picture of Display 81C
Fig. 3-2 Top View of Display 81C Dimensions
Fig. 3-3 Side View of Display 81C Dimensions

2
4. Function overview and functional area layout
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
Fig. 4-1 Functional Area Layout Interface of Display YL81C
4.3 Button definitions
There are three buttons on the operating unit of display YL81C, i.e., the on/off button , plus button and minus
button .
5. General operation
5.1 Power on/off
By pressing and holding the 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 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 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.
Maximum speed
  indicator
Average speed indicator
Battery level indicator
Bluetooth indicator
Speed indicator
Speed unit
Metric system: km/h
Imperial system: MPH
Headlight indicator
Assist level indicator
Distance/speed unit
Metric system: km, km/h
Imperial system: mile,
Trip distance indicator
ODO

3
Trip distance indicator
ODO
Average speed indicator
Maximum speed indicator
Fig. 5-1 Display Interface Switching
5.3 Push assistance
By pressing and holding the 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 button , your e-bike will immediately stop
power output and return to the state before push assistance.
Fig. 5-2 Push Assistance Indicator Interface
5.4 Headlight on/off
By pressing and holding the button , the controller will turn on the headlights and the display backlight will turn
dark. By pressing and holding the button again, the controller will turn off the headlights and the display backlight will
resumes the luminance.