FREESKY YL81F Electric Bike Display User Manual
- June 12, 2024
- FREESKY
Table of Contents
Electric Bike Display
User’s Manual
YL81F
Product Name and Model Number
Smart LCD display for electric bicycle; Model: YL81F.
Specification
- 24V/36V/48V power supply
- Display rated current 15mA
- Display maximum current 30mA
- Shutdown leakage current <1uA
- Supplied current to the controller 50mA
- Operating temperature -20～60℃
- Storage temperature -30 to 70°C
Appearance and Size
Figure 3-1
Physical picture of the YL81F display
Figure 3-2 Physical picture of the K5 control button|
Figure 3-3 Physical picture of the K6 control button
---|---
Figure 3-4 90T-V Front View
Dimension| 
Figure 3-5 90T-V Side View
Dimension
Function overview and Functional areas
4.1 Functional overview
The YL81F display offers a variety of features to suit your riding needs,
including:
- Battery level indicator
- Pedal assist (PAS) level indicator
- Speed (current speed, maximum speed, average speed)
- Mileage display (single and total mileage)
- Walk boost mode
- Light ON/OFF
- Error code indicator
- Motor power indicator (optional)
- USB connection indicator (optional)
- Cruise control indicator (optional)
- Bluetooth connection indicator (optional)
- Personalized parameter settings (e.g. wheel diameter, speed limit, battery power setting and PAS parameter setting, password setting, controller current limit setting, etc.).
- Factory default parameter recovery function
4.2 Functional areas
4.3 Button definitions
The YL81F display is equipped with five buttons on the corresponding operating unit: power on/off , plus , minus , light and toggle .
Routine operation
5.1 Power on/off
Long press to power on/off the display. When the display is off, it will not
use the battery power and the leakage current is less than 1uA.
The display will automatically shut off if it is not used for more than 10
minutes.
5.2 Display interface switching
When the display is powered on, it will show the Current Speed (km/h) and Trip
Odometer (km) by default. Short press to switch between Trip Odometer(km),
Odometer (km), Maximum Speed (km/h), and Average Speed (km/h).
5.3 Walk boost mode
Long Press and hold , the electric bicycle enters the walk boost mode. The
electric bicycle will walk at a fixed speed of 6 km per hour and the display
shows . Release to stop the power output immediately and restore to the
state before walk boost.
Figure 5-2 Helping to implement the display screen
The walk boost mode can only be used when pushing the electric bicycle, please
do not use it while riding.
5.4 Turning on/off lights
Press the to make the controller turn on the lights and the display backlight
becomes dim. Press again to make he controller turn off the lights and the
backlight restore brightness.
5.5 PAS level
selection
Press / to switch PAS level of electric bicycle, thus changing the motor
output power.
5.6 Battery level
display
The Battery level is shown as 5 bars. When the battery is full charged, all of
the 5 bars lighten up. When the battery is fully depleted, the bar will begin
to flash, warning the user to charge the battery as soon as possible.
5.7 Error code
display
If there is a fault occurs in the electronic system of the electric bicycle,
the display will automatically show an error code, see Schedule 1 for a
detailed definition of the error code. v When the error code appears on
the display, please troubleshoot the problem in time, the electric bicycle
will not be able to drive normally after the problem occurs.
Personalized parameter settings
Each setting needs to be done with the bicycle stationary.
The personalized parameter setting procedure is as follows:
When the display is ON and the speed shows 0,
- Press and hold simultaneously for more than 2 seconds to enter the personalized parameter setting interface.
- Press / to toggle between the personalized parameter setting interface, and press to enter the parameter changing state.
- Press / to select the parameter, long pres for addition operation, long press for subtraction operation.
- Press to save the parameter settings and return to the personalized parameter setting interface.
- Long Press to save the parameter settings and exit the personalized parameter setting interface.
The following options are available on the personalized parameter setting
interface:
6.1 Backlight luminance setting
01P is the backlight luminance setting. Parameters 01, 02 and 03 are
available, which represent the backlight luminance, 01 for the minimum
luminance, 02 for the standard luminance and 03 for the maximum luminance.
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.
Fig. 6-1 Backlight Luminance Setting Interface
6.2 Metric and Imperial setting
02P is the metric and imperial setting, 00 for metric and 01 for imperial.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface. 
6.3 Rated voltage setting
03P is the rated voltage setting. The available rated voltage range is: 24V,
36V, 48V.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-3 Rated voltage setting interface
6.4 Auto Sleep Time Setting
04P is the auto sleep time setting. To save the battery power and reach higher
range, this display will be turned off after it has not been used for a time.
The adjustable range is: 1~60min, 00 means no auto shutdown. The factory
default setting is 10 minutes.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-4 Auto Power Off Time Setting Interface
6.5 PAS level setting
05P is the Pedal assist level setting. The available PAS level settings are:
0~3, 1~3, 0~5, 1~5, 1~7, 0~7, 0~9, 1~9.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-5 PAS level setting interface
6.6 Wheel diameter setting
06P is the wheel diameter setting. The adjustable wheel diameter range is:
1~50inch.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-6 Wheel diameter setting interface
6.7 Number of speed sensor magnets setting
07P is the speed sensor magnet number setting. The adjustable speed sensor
magnet number range is: 1 ~ 255 pcs.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-7 Number of speed sensor magnets setting interface
6.8 Speed Limit Setting
08P is the speed limit setting. The adjustable speed limit range is:
1~100km/h. (The maximum adjustable speed limit varies by different protocols).
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-8 Speed limit setting interface
6.9 Start-up setting
09P is the start-up setting. The display can choose the following start modes:
00→zero start, 01→non-zero start.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-9 Start-up setting interface
6.10 Drive mode setting
10P is the drive mode setting. The available drive modes are: 00→Pedal assist
only, 01→Electric only, 02→Both Pedal assist and electric.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-10 Drive mode setting interface
6.11 Pedal assist sensitivity setting
11P is the pedal assist sensitivity setting. When set to higher numbers, it
will take more crank rotations to activate the motor. On lower numbers, it
will take little crank rotation to activate the motor. The adjustable range
is: 1~24.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-11 Pedal assist sensitivity setting interface
6.12 Pedal assist strength setting
12P is the Pedal assist strength setting. The Pedal assist strength is the
relative strength of the PWM signal from the controller when start to activate
pedal assist. The adjustable range is 0 ~ 5. 0 is the weakest strength and 5
is the strongest.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-12 Pedal assist Start-up intensity setting interface
6.13 Number of pedal assist sensor magnets setting
13P is the number of pedal assist sensor magnets setting. The adjustable
range: 5, 8, 12 pcs.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-13 Number of pedal assist sensor magnets setting interface
6.14 Controller Current Limit Setting
14P is the controller current limit setting. The adjustable range is: 1~50A.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-14 Controller current limit setting interface
6.15 Battery under voltage value setting
15P is the battery under voltage setting. The value can be adjusted based on
the current rated voltage.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-15 Battery under voltage value setting interface
6.16 ODO resets setting
16P is the ODO resets setting. The display can choose the following: 00→non
reset, 01→reset.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-16 ODO resets setting interface
6.17 Controller cruise control setting
17P is the controller cruise control setting. The display can choose the
following: 00→non enable, 01→enable.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-17 Controller cruise control setting interface
6.18 6km/h walk boost setting
18P is the 6km/h walk boost setting. The display can choose the following:
00→turn off walk boost function, 01→turn on walk boost function.
Press to enter the parameter changing state. Press the / to select the
parameter and press to save the parameter setting and return to the
personalized parameter setting interface.
Figure 6-18 6km/h walk boost setting interface
Shortcut operation
7.1 Restore factory settings operation
dEF is the restore factory default parameter settings. dEF-Y is to restore
default settings, and dEF-N is not to restore.
Enter into the main setting interface and keep the speed at 0, press and hold
and simultaneously for 2s to enter the restore factory default setting
interface. Pressing / to toggle to dEF-Y. Then after pressing to confirm,
the display will show dEF-0 for a few seconds and then automatically start to
restore the factory default settings.
The display will automatically exit to setting interface after the
restoration.
7.2 Trip odometer reset operation
The display can record trip odometer and odometer. Trip odometer is not
automatically reset after turning off. The trip odometer needs to be reset
manually.
Enter into the main setting interface and keep the speed at 0, press and hold
and simultaneously for 2s to reset the trip odometer. The main interface
will flash during the reset process.
Quality Assurance and Warranty
8.1 Warranty info
- Yolin will offer a limited warranty for any failure caused by the product defects under normal use during the warranty period.
- The product is warranted for 12 months from the date out of factory.
8.2 Warranty does not cover
- The shell is opened.
- The connector is damaged.
- Scratches on the appearance after the product is out of factory.
- Scratched or broken wires
- Failure or damage caused by force majeure (e.g. fire, earthquake, etc.) or natural disaster (e.g. lightning strike, etc.)
- Out of warranty period.
9. Wire connection diagram
9.1 Standard wire connection sequence
Controller connector
Display connector (Female terminal) Display connector (Male terminal)
Figure 9-1 Wire Connection Diagram
Table 9-1 Standard connector wire sequence table
| Standard Wire Sequence | Standard wire color | Function |
|---|---|---|
| 1 | Red (VCC) | Display power wire |
| 2 | Blue (Kp) | Controller power wire |
| 3 | Black (GND) | Display ground wire |
| 4 | Green (RX) | Display data reception wire |
| 5 | Yellow (TX) | Display data transmit wire |
- Some models are equipped with waterproof connectors and the color inside wires can not be seen.
Precautions
Pay attention to all the general operating when using the products and do not plug and unplug the display while it is powered on.
- Avoid bumping the display as much as possible.
- Please do not change the parameter settings at will, otherwise normal riding cannot be guaranteed.
- If display does not work properly, please send it to the repair center as soon as possible.
- There may be differences between the physical products and this manual due to normal upgrade. Please refer to the physical products.
Schedule 1: Error Code Definition
YL-01, YL-02 Error codes
Error code| Definition| | Error code| Definition
E001| Controller failure| E004| Throttle failure
E002| Communication failure| E005| Brake failure
E003| Hall failure| E006| Motor phase failure
YL-05, KDS, YL-J Error codes
Error code| Definition| | Error code| Definition
E021| Current failure| | E024| Hall failure
E022| Throttle failure| | E025| Brake failure
E023| Motor phase failure| | E030| Communication failure
Schedule 2: Error Code Definition
Customize YL-02 (LKLS) Error codes:
Error code| Definition| Handling method
Effor05| Brake failure| Check whether the brakes are in position;
Replace the brake handle.
Error06| Low-battery| Check whether the battery needs
recharging
Error07| Motor phase failure| Check whether the hall wire of the motor
is loose
Effor08| Throttle failure| Whether to return the handle; Check the
connection of the handle, if normal, need
to replace the handle
Effor09| Controller failure| Check the cable harness connection of
the controller or replace the controller
with a new controller
Errorl 0| Communication
reception failure| Check that the display cable is properly
connected
Errorll| Communication
transmission failure| Check that the display cable is properly
connected
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