Yolin YL91F-H Electric Bike Display User Manual

1. Product Name and Model Number

Smart LCD display for electric bicycle; Model: YL91F-H.

2. Specification

• 48V power supply
• Display rated current: 15mA
• Display maximum current: 30mA
• Shutdown leakage current: <1uA
• Supplied current to the controller: 50mA
• Operating temperature: -10℃ to 60℃
• Storage temperature: -30℃ to 70℃

3. Appearance and Size

The YL91F-H is a smart LCD display for electric bicycles. It includes a main display unit and a separate control button unit (K5 control button).

Display Dimensions:

• Front View: 115.5mm (width) x 65mm (height). Internal display area approximately 86mm x 62mm.
• Side View: Approximately 77mm (depth), 13.5mm (thickness), with a clamp diameter of 31.8mm and a mounting depth of 26mm.

[Diagram Description: Figure 3-1 shows the physical appearance of the YL91F-H display. Figure 3-2 shows the physical appearance of the K5 control button. Figures 3-3 and 3-4 provide detailed dimensions for the display unit.]

4. Function Overview and Functional Areas

4.1 Functional Overview

The YL91F-H display offers the following features:

• Battery level indicator ?
• Pedal assist (PAS) level indicator ⚙️
• Speed display (current speed, maximum speed, average speed)
• Mileage display (single trip odometer and total odometer)
• Walk boost mode ▶️
• Light ON/OFF ?
• Error code indicator ⚠️
• Cruise control indicator (optional)
• Personalized parameter settings (e.g., wheel diameter, speed limit)
• Factory default parameter recovery function

4.2 Functional Areas

The display interface is divided into several functional areas:

• Battery Level: Displays remaining battery charge.
• Odometer/Trip Odometer: Shows total distance and trip distance.
• Max Speed/Average Speed: Displays recorded maximum and average speeds.
• Speed: Shows current riding speed.
• PAS Level: Indicates the current Pedal Assist System level.
• Speed Unit: Displays speed in KM/H or MPH.
• Value and Unit: Displays various data values and their units.
• Walk Boost: Indicates when walk boost mode is active.
• Light ON/OFF: Shows the status of the bike's lights.
• Error Code: Displays error codes if system faults occur.
• Cruise Control: Indicates if cruise control is active.

[Diagram Description: Figure 4-1 illustrates the layout of these functional areas on the YL91F-H display.]

4.3 Button Definitions

The YL91F-H display unit is operated by five buttons:

• Power ON/OFF: Long press to turn the display on or off.
• Plus: Used for increasing values or navigating forward.
• Minus: Used for decreasing values or navigating backward.
• Light: Toggles the bike's lights and backlight brightness.
• Toggle: Cycles through different display interfaces and confirms selections.

5. Routine Operation

5.1 Power ON/OFF

Long press the [power] button to turn the display on or off. When the display is off, it consumes minimal battery power (leakage current less than 1uA).

The display will automatically shut off after 10 minutes of inactivity to conserve battery.

5.2 Display Interface Switching

When powered on, the display defaults to showing Current Speed and Odometer. Short press the [toggle] button to cycle through the following interfaces:

• Odometer (mile)
• Trip Odometer (mile)
• Maximum Speed (mile/h)
• Average Speed (mile/h)

[Diagram Description: Figure 5-1 shows the sequence of interface switching between Odometer, Trip Odometer, Average Speed, and Maximum Speed displays.]

5.3 Walk Boost Mode

Long press and hold the [walk boost] button. The electric bicycle enters walk boost mode, moving at a constant speed (typically 6 km/h) indicated on the display. Release the button to stop power output and return to the previous state.

Note: Walk boost mode is intended for pushing the bicycle, not for riding.

[Diagram Description: Figure 5-2 illustrates the display screen during walk boost mode, showing the speed at 6 km/h.]

5.4 Turning On/Off Lights

Press the [light] button to turn on the bicycle's lights and dim the display backlight. Press the [light] button again to turn off the lights and restore the backlight to its normal brightness.

[Diagram Description: Figure 5-3 shows the display interface when the lights are on and the backlight is dimmed.]

5.5 PAS Level Selection

Use the [plus] and [minus] buttons to switch the Pedal Assist System (PAS) level, which adjusts the motor's output power. The display will show the selected level (e.g., 1 to 5).

[Diagram Description: Figure 5-4 shows examples of different PAS levels displayed on the screen.]

5.6 Battery Level Display

The battery level is indicated by 5 bars. All 5 bars are lit when the battery is full. As the battery depletes, bars will turn off. When the battery is critically low, the remaining bar will flash as a warning to recharge.

[Diagram Description: Figure 5-5 illustrates the battery level indicator, showing states from full power to empty power.]

5.7 Error Code Display

If a fault occurs in the electric system, the display will show an error code. Refer to Schedule 1 for detailed error code definitions. Promptly addressing error codes is necessary for normal operation.

[Diagram Description: Figure 5-6 shows the display indicating an "ERROR" with a code.]

6. Personalized Parameter Settings

Note: All parameter settings must be performed while the bicycle is stationary.

Setting Procedure:

1. With the display ON and speed at 0, press and hold the [plus] and [minus] buttons simultaneously for over 2 seconds to enter the parameter setting interface.
2. Press [minus] or [plus] to navigate between different parameter settings. Press the [toggle] button to enter the parameter changing state for the selected setting.
3. Use the [plus] button (or long press for rapid increase) to increase a parameter value, and the [minus] button (or long press for rapid decrease) to decrease it.
4. Press the [toggle] button to save the current parameter setting and return to the parameter selection interface.
5. Long press the [toggle] button to save all changes and exit the parameter setting interface.

6.1 Backlight Luminance Setting

Parameter: 01P. Sets the backlight brightness. Options are 01 (minimum), 02 (standard), and 03 (maximum).

[Diagram Description: Figure 6-1 shows the interface for setting backlight luminance, displaying "01P" and the selected value "03".]

6.2 Metric and Imperial Setting

Parameter: 02P. Sets the unit system. 00 selects Metric (km/h, km), and 01 selects Imperial (mile/h, mile).

[Diagram Description: Figure 6-2 shows the interface for setting metric/imperial units, displaying "02P" and the selected unit "00" (metric) or "01" (imperial).]

6.3 Rated Voltage Setting

Parameter: 03P. Sets the display's rated voltage. Available options: 24V, 36V, 48V, 52V.

[Diagram Description: Figure 6-3 shows the interface for setting the rated voltage, displaying "03P" and a voltage value like "48V".]

6.4 Auto Sleep Time Setting

Parameter: 04P. Sets the auto-shutdown time to conserve battery. Range: 00 (no auto-shutdown) to 60 minutes. Factory default is 10 minutes.

[Diagram Description: Figure 6-4 shows the interface for setting auto sleep time, displaying "04P" and the selected time like "10".]

6.5 PAS Level Setting

Parameter: 05P. Sets the available Pedal Assist System (PAS) levels. Options include 0~3, 1~3, 0~5, 1~5.

[Diagram Description: Figure 6-5 shows the interface for setting PAS levels, displaying "05P" and a range like "0-5".]

6.6 Wheel Diameter Setting

Parameter: 06P. Sets the wheel diameter. Range: 1 to 50 inches.

[Diagram Description: Figure 6-6 shows the interface for setting wheel diameter, displaying "06P" and a diameter value like "29.0".]

6.7 Number of Speed Sensor Magnets Setting

Parameter: 07P. Sets the number of magnets on the speed sensor. Range: 1 to 255 pieces.

[Diagram Description: Figure 6-7 shows the interface for setting the number of speed sensor magnets, displaying "07P" and a count like "01".]

6.8 Speed Limit Setting

Parameter: 08P. Sets the maximum speed limit. Range: 0 to 63 mile/h (0 to 100 km/h). The exact limit may vary by protocol.

[Diagram Description: Figure 6-8 shows the interface for setting the speed limit, displaying "08P" and a speed limit like "45".]

6.9 Start-up Setting

Parameter: 09P. Selects the start-up mode. 00: Zero start (requires initial pedal rotation). 01: Non-zero start (motor engages immediately upon power-on).

[Diagram Description: Figure 6-9 shows the interface for start-up settings, displaying "09P" and the selected mode "00" or "01".]

6.10 Drive Mode Setting

Parameter: 10P. Selects the drive mode. Options: 00 (Pedal assist only), 01 (Electric only), 02 (Both Pedal assist and electric).

[Diagram Description: Figure 6-10 shows the interface for drive mode settings, displaying "10P" and the selected mode "02".]

6.11 Pedal Assist Sensitivity Setting

Parameter: 11P. Adjusts the sensitivity of the pedal assist. Higher numbers require more pedal rotation to activate the motor; lower numbers require less rotation. Range: 1 to 24.

[Diagram Description: Figure 6-11 shows the interface for pedal assist sensitivity, displaying "11P" and a sensitivity value like "02".]

6.12 Pedal Assist Strength Setting

Parameter: 12P. Sets the strength of the pedal assist. This relates to the PWM signal strength from the controller. Range: 1 (weakest) to 5 (strongest).

[Diagram Description: Figure 6-12 shows the interface for pedal assist strength, displaying "12P" and a strength value like "03".]

6.13 Number of Pedal Assist Sensor Magnets Setting

Parameter: 13P. Sets the number of magnets on the pedal assist sensor. Available options: 5, 8, 12 pcs.

[Diagram Description: Figure 6-13 shows the interface for setting the number of pedal assist sensor magnets, displaying "13P" and a count like "12".]

6.14 Controller Current Limit Setting

Parameter: 14P. Sets the current limit for the controller. Range: 1 to 50A.

[Diagram Description: Figure 6-14 shows the interface for controller current limit, displaying "14P" and a current limit value like "28".]

6.15 Battery Under Voltage Value Setting

Parameter: 15P. Sets the battery's under-voltage cutoff threshold, adjustable based on the rated voltage.

[Diagram Description: Figure 6-15 shows the interface for battery under-voltage setting, displaying "15P" and a voltage value like "40.0".]

6.16 ODO Resets Setting

Parameter: 16P. Configures Odometer reset behavior. 00: Non-reset (total odometer cannot be reset). 01: Reset (allows trip odometer reset).

[Diagram Description: Figure 6-16 shows the interface for ODO reset settings, displaying "16P" and the option "00" or "01".]

6.17 Controller Cruise Control Setting

Parameter: 17P. Enables or disables the controller's cruise control function. 00: Disabled. 01: Enabled.

[Diagram Description: Figure 6-17 shows the interface for cruise control settings, displaying "17P" and the option "00" or "01".]

6.18 6km/h Walk Boost Setting

Parameter: 18P. Controls the 6km/h walk boost function. 00: Turn off walk boost function. 01: Turn on walk boost function.

[Diagram Description: Figure 6-18 shows the interface for the 6km/h walk boost setting, displaying "18P" and the option "01".]

7. Shortcut Operation

7.1 Restore Factory Default Parameter Settings Operation

To restore factory default settings, enter the main interface, ensure the speed is 0, then press and hold the [plus] and [minus] buttons simultaneously for 2 seconds. This enters the restore interface. Use [plus]/[minus] to select "dEF-Y" (yes to restore) or "dEF-N" (no to restore). Press [toggle] to confirm. The display will show "dEF-0" briefly, then automatically restore defaults and exit to the main interface.

[Diagram Description: Figure 7-1 shows the sequence of screens for restoring factory default settings, including "dEF-0", "dEF-Y", and "dEF-N".]

7.2 Trip Odometer Reset Operation

The display records both the odometer (total distance) and the trip odometer. The trip odometer does not reset automatically when the display is turned off and must be reset manually. The odometer cannot be reset.

To reset the trip odometer: Enter the main interface, ensure speed is 0, then press and hold the [minus] and [toggle] buttons simultaneously for 2 seconds. The main interface will flash during the reset process.

[Diagram Description: Figure 7-2 illustrates the trip odometer reset, showing the change from 21.5km to 0.0km.]

8. Quality Assurance and Warranty

8.1 Warranty Info

• Yolin offers a limited warranty against product defects under normal use for the warranty period.
• The product is warranted for 12 months from the date of factory shipment.

8.2 Warranty Does Not Cover

• The product shell has been opened.
• The connector is damaged.
• Scratches on the appearance after the product leaves the factory.
• Scratched or broken wires.
• Damage caused by force majeure (fire, earthquake, natural disaster like lightning strikes, etc.).
• Damage incurred outside the warranty period.

9. Wire Connection Diagram

9.1 Standard Wire Connection Sequence

The display connects to the controller and other components via specific wire sequences.

[Diagram Description: Figure 9-1 shows the controller connector and the display connectors (female and male terminals) with numbered pins.]

Note: Some models may have waterproof connectors where internal wire colors are not visible.

10. Precautions

• Pay attention to general operating instructions. Do not plug or unplug the display while it is powered on.
• Avoid bumping or dropping the display.
• Do not change parameter settings arbitrarily, as this may affect normal riding performance.
• If the display malfunctions, send it to an authorized repair center promptly.
• Product appearance and specifications may differ slightly due to normal upgrades. Refer to the physical product for the most accurate information.

Schedule 1: Error Code Definition

YL-02 Error codes:

Contact Information

Tel: 022-86838795

Fax: 022-86838795

Email: yolin@yolintech.com

Website: www.yolintech.com

Address: Tianjin Beichen District, Tianjin Beichen Economic Development Zone, Medical Equipment Industrial Park, East of Jingfu Highway, Ugu New Science Park 52-1 plant.