When working with inverters, it's essential to separate signal lines from power lines to minimize interference. If you're using an analog signal for remote control, make sure the signal line is kept away from the main circuit of the inverter and its associated loop. Maintain a minimum distance of 30 cm between them, even within the control cabinet. The length of the control loop between the signal and the inverter should not exceed 50 meters. To further reduce interference, place the signal and power lines into different metal conduits or hoses. If the signal line between the PLC and inverter isn't enclosed in a metal conduit, it becomes highly susceptible to external interference. Since inverters often lack built-in reactors, their input and output power lines can generate strong electromagnetic interference. Therefore, ensure that the metal conduit for the signal line extends all the way to the inverter’s control terminal, completely isolating it from the power lines. For analog control signals, it's recommended to use double-shielded twisted pair cables with a cross-sectional area of 0.75 mm². When stripping the cable, keep the exposed length as short as possible (5–7 mm), and wrap the shielded part with insulating tape to prevent contact with other equipment, which could introduce noise. To simplify wiring and improve reliability, crimp terminals are suggested for signal connections. When configuring the inverter, pay close attention to the parameters. Each setting has a specific range, and improper configuration can lead to operational issues. Common control modes include speed control, torque control, and PID control. After selecting the mode, perform static or dynamic identification based on the required accuracy. Set the minimum operating frequency carefully, as running the motor at low speeds can lead to poor heat dissipation and potential damage. Similarly, the maximum operating frequency should be chosen wisely, as high frequencies can stress motor bearings and rotor structures. The carrier frequency setting also plays a role in system performance. A higher carrier frequency increases harmonic distortion, affecting both the motor and the cable. Motor parameters such as power, current, voltage, speed, and maximum frequency should be set based on the motor nameplate data. Additionally, consider frequency hopping to avoid resonance points, especially in systems with high mechanical sensitivity. When controlling compressors, avoid frequencies that may cause surging. Common faults include overcurrent, overload, and under-voltage. Overcurrent can occur during acceleration, deceleration, or constant speed and may result from short acceleration/deceleration times, sudden load changes, or short circuits. Extending acceleration time, balancing loads, and checking the wiring can help resolve these issues. In severe cases, the inverter may need replacement. Overload faults can affect either the inverter or the motor and may stem from insufficient acceleration time, low grid voltage, or excessive load. Adjusting acceleration time, checking the power supply, and inspecting the mechanical system can help. If the issue persists, consider upgrading to a more powerful motor or inverter. Under-voltage faults indicate problems with the inverter’s power input. Before starting the system, ensure the power supply is stable and functioning correctly. Regular maintenance and proper setup are key to ensuring reliable operation of the inverter and connected equipment.
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