UK S2 Manual

1. Production Name

Middle set negative LCD display, model UKS2

2. Supplier

Tianjin UKriver Science and Technology co.,ltd

3. SPEC

• 24V/36V/48V/60V/72V/UBE power supply
• Rated power: 1W
• USB charge: DC 5V 500mA
• Power off leak current: <1uA
• Controller supply work current: 100mA, peak lower than 300mA
• Operating temperature: -20°C ~ 70°C
• Storage temperature: -30°C ~ 80°C

4. Parameter and Material

ABS housing. The material for the transparent window is imported high hardness acrylic. The bracket is made of glass fiber and nylon.

Dimensions:

Front View: Width 61.2mm, Height 92.8mm.

Side View: Width 80.0mm, Height 55.3mm.

5. Production Introduction

• Speed display: Includes real-time speed “RT SPEED”, “MAX SPEED”, and average speed “AVG SPEED”.
• SEETING SPEED SCALE (mph/kph): Km / mile display can be set according to customer habits.
• Intelligent battery indicator: Provides stable battery reminder through an optimization algorithm. Power is not affected by motor start-stop fluctuations. If the system supports battery communication, it can display accurate percentage power.
• 5 levels of backlight brightness: Brightness can be set according to customer usage habits. Level 1 is the darkest and Level 5 is the brightest.
• Gears: Supports up to 9 gears, configurable for user needs (e.g., 3/5/9/6 gears).
• Mileage display: Can display accumulated mileage “ODO”, single mileage “Trip”, and riding time “Time”.
• Output power indication: Real-time display of output power (battery output power).
• Fault Reason Display: Provides descriptions for fault codes.
• Walk assist function: Supports 6km walk assist.
• Speed measuring magnets number adjustment: Numbers can be set according to actual customer requirements.
• PAS magnets number adjustment: Numbers can be set according to actual customer requirements.
• Endurance mileage indication: Requires battery to support communication.
• Battery information display: Requires battery to support communication.

6. LCD Display Instructions

LCD Full Display Layout:

The display includes indicators for: Brake Indicator, Faulty Indicator, Front Light, USB Indicator, Power Indicator, Speed Mode, Speed Circle, Gear Indicator, Mileage Mode, Value Indicator.

• Speed mode: Displays average speed (AVG SPEED), maximum speed (MAX SPEED), and real-time speed (RT SPEED).
• Speed display: Shows speed value in Km/h (kilometers per hour) or MPH (miles per hour).
• Power Indicator: Provides a stable battery reminder. Power is not affected by motor start-stop fluctuations. If the system supports battery communication, it can display accurate percentage power.
• Headlight indication: Displays an icon [headlight-on] when the headlights are on.
• Brake Indicator: Displays an icon [brake-on] when the brake is applied (power off).

7. Function Description

Button Description: The display unit features a Power Button, Mode Button, Plus Button, and Minus Button.

7.1 Power On/Off

Long press the Power Button (1 second) to turn the display on or off. The display automatically turns off after 5 minutes of inactivity (user-configurable).

7.2 PAS Gear Choose

In manual shift mode, short press the Plus Button or Minus Button to switch the assist position (gears). The assist ratio ranges from 1 (lowest) to 9 (highest). Gear 0 is neutral assist.

Visual representation of gear selection: 0 Gear, 3 Gear, 9 Gear.

7.3 Mileage Mode Switch

When powered on, short-press the Power Button to cycle through display modes: riding time (Time) → accumulated mileage (ODO) → power information (Pow) → single mileage (Trip). The display returns to single mileage after 5 seconds of no operation.

7.4 Speed Mode Switch

When powered on, short-press the Mode Button to cycle through speed display modes: real-time speed (RT SPEED) → average speed (AVG SPEED) → maximum speed (MAX SPEED). The display returns to real-time speed after 5 seconds of no operation.

7.5 Headlight / Backlight Switch

Press and hold the Plus Button (1 second) to decrease backlight brightness and turn on the lights (requires controller support). Press and hold the Plus Button again (1 second) to restore original brightness and turn off the lights.

Visual representation: Headlight off, Headlight on.

Note: Meter backlight brightness can be adjusted in 5 levels.

7.6 Walking Mode (6km walk assist)

Press and hold the Minus Button (1 second) to enter the boosting state for walking assist. The speed displays real-time speed, and the gear position displays "P". Release the Minus Button to exit walking mode. (Note: Some controllers may not support this function).

Visual representation: Walking Mode Off, Walking Mode On.

7.7 USB Function

Long press the Mode Button (1 second) to turn on the USB function for charging mobile devices (DC 5V 500mA). Long press the Mode Button for more than 1 second to turn off the USB function.

Visual representation: USB ON, USB OFF.

7.8 Clear Data

Press the Plus Button and Minus Button simultaneously for 1 second to clear temporary data, including maximum speed (MAX SPEED), average speed (AVG SPEED), single mileage (TRIP), and riding time (TIME). This data is not cleared when the display or electric bike is turned off.

8. MENU Parameter Setting

To enter the parameter setting state, press the Mode Button twice (less than 0.3 seconds between presses) when the unit is powered on. Press the Mode Button twice again to exit.

While in setting state:

• Press Mode Button to select the desired adjustment item.
• When a parameter flashes, use the Plus Button and Minus Button to adjust it.
• Press the Power Button to save and switch to the next parameter.
• Press Mode Button twice to exit the setting state.

Note: If no key operation is performed for 30 seconds, the system automatically exits the setting state. The setting interface cannot be accessed while riding (speed indication is not 0).

8.1 Display Setting Items:

The setting items include: Backlight Brightness, Automatic shutdown time, Universal/England, Password Input, Manual/Automatic Switch.

• Backlight Brightness (P1): Use Plus/Minus buttons to select brightness level from 1 (darkest) to 5 (brightest).
• Automatic shutdown time (P2): Use Plus/Minus buttons to set the time from 1 to 9 minutes, or OFF to disable.
• Universal/England (P3): Use Plus/Minus buttons to switch between km/h (0 for universal system) and MPH (1 for England system).
• Manual/Automatic Switching (P4): Use Plus/Minus buttons to select manual gear (0) or automatic gear (1).
• Password Input: To enter advanced settings, the display shows "ADS". Short press Mode Button to enter password input state ("PSD"). Use Plus/Minus buttons to set the 4-digit password (default "1801"). Press Mode Button to confirm. Incorrect password shows "Err".

8.2 Advanced Setting Items:

The advanced setting items include: Voltage, Gear, Speed Limiting, Current Limiting, Wheel Diameter, PAS direction, Throttle 6KM, PAS magnet number, Speed measurement.

• Voltage Choices (A1): Use Plus/Minus buttons to switch between 24V, 36V, 48V, 60V, 72V, or UBE (user-defined voltage). Refer to computer parameter setting instructions for UBE details.
• Assistance gear selection (A2): Use Plus/Minus buttons to set the gear range: 1 for 3-speed, 2 for 5-speed, 3 for 6-speed, 4 for 9-speed.
• Speed Limiting Adjustment (A3): Use Plus/Minus buttons to adjust the speed limit value (default 25 km/h). Press Power Button to confirm and exit.
• Current Limiting Adjustment (A4): Use Plus/Minus buttons to adjust the current limit value (default 15A). Press Power Button to confirm and exit.
• Wheel Diameter Selection (A5): Use Plus/Minus buttons to select wheel diameter (e.g., 16, 18, 20, 22, 24, 26, 27, 700C, 28, 29, 30, 31, 32 inches). Incorrect selection can cause abnormal speed.
• Number of speed measuring magnets (A6): Use Plus/Minus buttons to adjust the number of speed measuring magnets (1-72). Press Power Button to confirm and exit.
• Number of PAS magnets (A7): Use Plus/Minus buttons to adjust the number of PAS magnets (3-15). Press Power Button to confirm and exit.
• Throttle 6KM: Use Plus/Minus buttons to select the 6km function switch.
• PAS orientation (A9): Use Plus/Minus buttons to select the direction of the power sensor.
• Driving Model (A10): Use Plus/Minus buttons to select the driving model: 0 (Manpower Riding), 1 (Pure Electric Riding), 2 (Pedal Assist Riding).
• Handlebar Speed adjustment (A11): Use Plus/Minus buttons to select the PWM duty cycle of the handlebar (0 to 1000).
• Booster Start Strength (A12): Use Plus/Minus buttons to select the boost start intensity (0 is weakest, 5 is strongest).

9. Error Code Definition

The UKS1 display provides error indications for vehicle faults. When a fault is detected, the LCD screen displays an error icon [error-icon], the error code "n", and an error description at the speed display position. Refer to the error code comparison table for details.

If there are 2 or more errors, they will be combined. For example, Error 20H and Error 40H will show Error 60H.

Visual representation: Error Warning Interface.

10. Installation Instruction

10.1 Screw Assembly: Refer to the screw installation drawing. Pay attention to the screw tightening torque. Instrument damage caused by excessive torque is not covered by the warranty.

Visual representation: Screw Installation Drawing showing M4*8mm, M3*8mm, M4*12mm screws for display host and bracket.

10.2 Handlebar Clips: Clips are suitable for handlebar sizes: 31.8mm, 25.4mm, and 22.2mm. Customers can choose according to actual needs. 25.4mm and 22.2mm may require corresponding conversion.

11. Cable Outlet Definition

The five-core waterproof line has the following colors and functions:

• RED: Power+ (Battery power 24V/36V/48V)
• Blue: Controller lock cable
• Black: GND
• Green: RXD display input signal (display receives signal from controller)
• Yellow: TXD display output signal (display sends signal to controller)