1. Introduction
This manual provides essential information for the safe and efficient operation of your MENDUNER AT1-4000X Variable Frequency Drive (VFD). Please read this manual thoroughly before installation, operation, or maintenance to ensure proper usage and prevent damage or injury.
The AT1-4000X VFD is designed to control the speed of three-phase AC motors. It features a unique control method to achieve high torque, high precision, and a wide range of speed regulation, offering high performance. It also provides good anti-trip performance and the ability to adapt to strong power interference, temperature, humidity, and dust, significantly improving stability. By optimizing PWM control technology and electromagnetic compatibility, it meets user requirements for low noise and low electromagnetic interference. It offers fast start and stop response and high torque at low speeds.
2. Safety Precautions
Failure to follow these safety instructions may result in electric shock, fire, or serious injury. Always observe all warnings and instructions.
- Before wiring, ensure the power supply is completely disconnected.
- Wiring should only be performed by a qualified professional engineer.
- Do not install the inverter on flammable or explosive materials.
- The ground terminal of the inverter must be properly and securely grounded.
- Do not touch the inverter terminals immediately after power-off, as residual voltage may still be present.
- Only professional personnel should perform wiring and internal maintenance due to high voltage inside the inverter, which can cause electric shock.
3. Product Features
- Unique control method for high torque, high precision, and wide speed regulation.
- Excellent anti-trip performance and adaptability to power interference, temperature, humidity, and dust.
- Optimized PWM control and electromagnetic compatibility for low noise and interference.
- Simple wiring process: connect wires after removing screws.
- Fast start and stop response with high torque at low speeds.
4. Specifications
| Parameter | Value |
|---|---|
| Model | AT1-4000X |
| Rated Voltage | AC220V (Single Phase) |
| Suitable Motor Power | 4 kW |
| Control Method | Open-loop V/F |
| Output Voltage Regulation Method | PWM Control |
| Rated Current | 20 A |
| Maximum Output Frequency Range | 0 - 400 Hz |
| Dimensions | 22 x 21 x 17 cm |
| Weight | 1.58 kg |
5. Setup
5.1 Wiring Diagram
Refer to the diagram below for correct wiring connections. Ensure all connections are secure and follow local electrical codes.
Figure 5.1: Wiring Diagram. Connect single-phase 220V power to L and N, and ground to E. Connect the three-phase motor to U, V, and W. Additional terminals are available for external analog voltage inputs and control signals.
5.2 Terminal Functions
- L, N: Single-phase AC 220V input.
- U, V, W: Output terminals for connection to a three-phase AC motor.
- GND: Ground connection.
- X1-X6, COM: Control input terminals for various functions.
- VL1/CI, 10V/5V, 15V: External analog voltage input terminals.
- SP1: Open collector output 1.
Figure 5.2: Terminal Block. Clearly labeled terminals for power input, motor output, and ground.
Figure 5.3: VFD with Terminal Detail. This view emphasizes the robust design and clear labeling of the wiring connections.
6. Operating Instructions
6.1 Control Panel Overview
The control panel allows for monitoring and adjustment of the VFD's parameters. Familiarize yourself with the buttons and display indicators.
Figure 6.1: Control Panel Instruction. This image details the layout of the control panel, including the display, buttons, and indicator lights.
6.2 Control Panel Functions
- 5-digit LED display: Shows operational parameters such as frequency, speed, voltage, and current.
- DISP Button: Used to cycle through different display parameters.
- PROG Button: Enters or exits programming mode for parameter settings.
- FUNG/DATA Button: Used for function selection and data entry/confirmation within programming mode.
- FWD/REV (Up) Button: Initiates forward/reverse rotation and increases parameter values.
- RUN Button: Starts the motor operation.
- STOP/RESET Button: Stops the motor operation and resets fault conditions.
- Down Button: Decreases parameter values.
6.3 Function Indicator Lights
- FWD: Illuminates when the motor is rotating clockwise.
- REV: Illuminates when the motor is rotating counter-clockwise.
- r/min: Illuminates when the display shows motor speed in revolutions per minute.
- H: Illuminates when the display shows output frequency in Hertz.
- V: Illuminates when the display shows output voltage in Volts.
- A: Illuminates when the display shows output current in Amperes.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your VFD. Always disconnect power before performing any maintenance.
- Cleaning: Periodically clean the VFD's exterior and ventilation openings to prevent dust accumulation. Use a soft, dry cloth. Do not use liquid cleaners.
- Ventilation: Ensure that the cooling fans and heat sinks are free from obstructions. Proper airflow is crucial for heat dissipation.
- Connections: Regularly check all wiring connections for tightness and signs of corrosion. Loose connections can lead to overheating or malfunction.
- Environment: Maintain the operating environment within specified temperature, humidity, and dust levels to prevent premature wear.
Figure 7.1: VFD Heat Sink and Fans. Ensure these components are kept clean and unobstructed for efficient cooling.
Figure 7.2: Rear View with Model Information. This view shows the product label and cooling vents.
8. Troubleshooting
This section provides solutions to common issues. For problems not listed here, contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| VFD does not power on | No power supply; Loose wiring; Blown fuse | Check power source; Verify all wiring connections; Replace fuse if necessary. |
| Motor does not run | Incorrect wiring; Motor fault; VFD parameter error | Review wiring diagram; Check motor for damage; Verify VFD settings. |
| Motor runs erratically or at wrong speed | Incorrect frequency setting; Load too high; Interference | Adjust frequency parameter; Reduce motor load; Check for electromagnetic interference. |
| Overcurrent/Overload error | Motor overloaded; Short circuit; Acceleration time too short | Reduce load; Check motor and wiring for short circuits; Increase acceleration time parameter. |
| Overvoltage/Undervoltage error | Input voltage fluctuation; Deceleration time too short | Check input power supply stability; Increase deceleration time parameter. |
9. Warranty and Support
9.1 Warranty Information
This product is covered by a standard manufacturer's warranty. Please refer to your purchase documentation for specific warranty terms and conditions. The warranty typically covers defects in materials and workmanship under normal use. Damage resulting from improper installation, misuse, unauthorized modifications, or failure to follow the instructions in this manual is not covered.
9.2 Customer Support
For technical assistance, troubleshooting beyond this manual, or warranty claims, please contact MENDUNER customer support through the retailer where the product was purchased. Please have your model number (AT1-4000X) and purchase date ready when contacting support.