1. Introduction
This manual provides essential instructions for the safe and effective operation, installation, and maintenance of the CEMELI UX-52 MCU Control Multi-Function Digital Display Motor Speed Regulator Controller. Please read this manual thoroughly before installation and use to ensure proper functionality and to prevent damage to the device or connected equipment.
2. Safety Information
- Always disconnect power before performing any wiring, installation, or maintenance.
- Ensure all wiring connections are secure and comply with local electrical codes.
- This device operates with high voltage (AC220V). Exercise extreme caution to avoid electric shock.
- Do not operate the controller in wet or damp environments.
- Do not exceed the specified maximum load (400W, 3A).
- Installation and servicing should only be performed by qualified personnel.
3. Product Overview
3.1 Components
The UX-52 motor speed controller features a digital display for precise speed indication, control buttons for various functions, and a rotary knob for speed adjustment.

Figure 1: Front panel of the UX-52 controller. It includes a digital display, 'MODE', 'UP', 'DOWN', 'ENTER', 'REV', 'STOP', and 'FWD' buttons, and a rotary 'SPEED CONTROL' knob.

Figure 2: Side view of the UX-52 controller. The label indicates 'UX-52/003 MCU CONTROL', 'MAX.AMP 3A', 'FREQ. 50/60HZ', and 'VOLT.AC110-240V'.
3.2 Features
- MCU Control for stable performance.
- Digital display for precise speed monitoring.
- Multi-function control including Forward and Reverse operation.
- Pinpoint speed regulation.
- Compatible with AC220V, 50/60Hz power supplies.
4. Setup
4.1 Mounting
The controller is designed for panel mounting. Ensure adequate ventilation around the unit to prevent overheating. Secure the controller using appropriate fasteners through the mounting holes.
4.2 Wiring
Refer to the wiring diagram on the back of the controller and the images below for correct connections. Ensure all connections are tight and insulated.

Figure 3: Rear wiring panel of the UX-52 controller. Terminals are provided for AC power input (L, N), motor windings, a motor capacitor, and control signals (K1, K2, 0V, S).

Figure 4: Detailed view of the UX-52 controller's rear wiring panel with a connected cable, illustrating the connection points for power, motor, and control.

Figure 5: Close-up of the wiring harness connector, showing individual pin labels and wire colors for external connections.
- Power Input (L, N): Connect your AC power supply (AC110-240V, 50/60Hz) to the 'L' (Live) and 'N' (Neutral) terminals.
- Motor Connections: Connect the motor windings and capacitor according to the diagram on the unit. Typically, two terminals are for the motor windings and two for the capacitor. Ensure correct phasing for motor direction.
- Control Signals (K1, K2, 0V, S): These terminals are for external control. 'K1' and 'K2' are typically used for forward/reverse commands, '0V' is the common ground, and 'S' may be for speed feedback or an external speed control signal. Consult your motor and system requirements for specific connections.
5. Operating Instructions
5.1 Power On/Off
After ensuring all connections are correct and secure, apply power to the controller. The digital display will illuminate.
5.2 Speed Adjustment
Rotate the 'SPEED CONTROL' knob on the front panel to adjust the motor's speed. The digital display will show the current speed setting or actual speed, depending on the mode.
5.3 Direction Control
- Press the 'FWD' button to initiate forward rotation of the motor.
- Press the 'REV' button to initiate reverse rotation of the motor.
5.4 Stop Function
Press the 'STOP' button to halt the motor's operation.
5.5 Mode Selection
Press the 'MODE' button to cycle through different operating modes or display parameters. Use the 'UP' and 'DOWN' buttons to adjust settings within a selected mode, and 'ENTER' to confirm.
6. Maintenance
- Keep the controller clean and free from dust and debris. Use a soft, dry cloth for cleaning.
- Regularly inspect wiring connections for tightness and signs of wear or damage.
- Ensure ventilation openings are not obstructed.
- Do not attempt to open the casing or repair the internal components. Refer servicing to qualified technicians.
7. Troubleshooting
- No Power/Display Off: Check power supply connections (L, N) and ensure the power source is active. Verify input voltage.
- Motor Not Running: Ensure the motor is properly connected to the controller. Check motor windings and capacitor connections. Verify that a direction (FWD/REV) has been selected and the speed knob is not at minimum.
- Incorrect Speed: Adjust the speed control knob. If the issue persists, check motor specifications and ensure they are compatible with the controller's output.
- Motor Runs in Wrong Direction: If the motor direction is incorrect when FWD/REV is selected, check the motor wiring or adjust settings if available in advanced modes.
- Overload/Overheating: Disconnect power immediately. Check if the motor load exceeds the controller's maximum capacity (400W, 3A). Ensure proper ventilation.
8. Specifications
| Parameter | Value |
|---|---|
| Model | UX-52 |
| Input Voltage | AC110-240V |
| Frequency | 50/60Hz |
| Max Power | 400W |
| Max Current | 3A |
| Control Type | MCU Control |
| Display | Digital Display |
| Functions | Speed Regulation, Forward/Backward Control |
| Item Weight | 1.76 ounces (50 Grams) |
| Package Dimensions | 1.18 x 0.79 x 0.39 inches |
9. Warranty and Support
For warranty information and technical support, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.