Inverter parameter settings - Solutions - Huaqiang Electronic Network

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When working with inverters, there are many parameters that can be adjusted, each with specific ranges. Improper settings can lead to operational issues or even damage to the system. It's essential to configure these parameters correctly for optimal performance. 1. **Control Method**: This includes speed control, torque control, or PID control. Once the method is selected, static or dynamic identification is usually performed to ensure accuracy. 2. **Minimum Operating Frequency**: This determines the lowest speed at which the motor can run. Running at low speeds for extended periods can cause overheating and reduce the motor’s lifespan. Additionally, increased current in cables may lead to overheating. 3. **Maximum Operating Frequency**: Most inverters operate up to 60Hz, but some can go as high as 400Hz. High frequencies increase motor speed, which may exceed the bearing capacity of standard motors, leading to mechanical stress. 4. **Carrier Frequency**: A higher carrier frequency increases harmonic distortion, affecting motor and cable heating. The setting should consider the length of the cable and the motor's thermal limits. 5. **Motor Parameters**: These include power, current, voltage, speed, and maximum frequency. These values can typically be found on the motor’s nameplate. 6. **Frequency Hopping**: At certain frequencies, resonance can occur. Especially in systems with high inertia, such as compressors, avoiding these points is crucial to prevent mechanical damage. 7. **Acceleration/Deceleration Time**: These settings determine how quickly the motor accelerates or decelerates. Proper adjustment prevents overcurrent during acceleration and overvoltage during deceleration. Testing and gradual fine-tuning are recommended. 8. **Torque Boosting**: This compensates for reduced torque at low speeds by increasing the V/F ratio. Automatic settings adjust the voltage during acceleration, while manual settings allow for better customization based on load conditions. 9. **Electronic Thermal Protection**: This function uses the inverter’s CPU to monitor motor temperature based on current and frequency. It’s suitable for single-motor applications; for multiple motors, external thermal relays are needed. 10. **Frequency Limit**: This sets upper and lower bounds for the output frequency to protect the system from malfunction or external signal errors. It also helps limit speed in certain applications like conveyor belts. 11. **Offset Frequency**: Adjusts the base frequency when using an external analog signal. Some inverters allow polarity settings to correct misalignment between the input and output frequencies. 12. **Gain Setting**: Adjusts the relationship between the external signal and the inverter’s internal reference. For example, if the signal is 0–5V and the output is 0–50Hz, the gain would be set to 200%. 13. **Torque Limit**: Sets the maximum drive or brake torque the inverter can provide. It helps prevent overcurrent or overvoltage during sudden load changes. 14. **Acceleration/Deceleration Curve**: Options include linear, nonlinear, or S-shaped curves. Choosing the right curve depends on the load type—S-curves are ideal for constant torque loads. 15. **Torque Vector Control**: Mimics DC motor performance by controlling stator current components separately. Non-feedback vector control is common, allowing for precise control without speed feedback. 16. **Energy-Saving Control**: Designed for fans and pumps, this mode reduces voltage based on load, improving efficiency. However, it must be used appropriately, especially in vector control modes. It’s important to note that advanced features like energy-saving and slip compensation require careful configuration. Misuse can lead to frequent trips or unstable operation. Always verify motor parameters and ensure compatibility before enabling these functions.

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