The following is a rewritten and improved version of the original content in English, with additional information added to meet the 500-character requirement and presented as natural, human-written text:
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In addition to maintaining the frequency converter, extending its service life is equally important. This can be achieved through four main aspects.
First, electromagnetic interference (EMI) can significantly affect the performance of the inverter. In modern industrial control systems, microcomputers or PLCs are often used. During system design or modification, it's crucial to consider how the inverter may interfere with the microcomputer control board. Many user-designed control boards lack proper shielding and do not meet EMC standards, leading to abnormal system behavior due to conducted and radiated interference. To mitigate this, ensure good grounding for strong electrical systems like motors, and separately ground the shielding of the microcomputer control board. For severe cases, connect sensor and I/O shield layers to the control ground. Installing EMI filters, common-mode inductors, and high-frequency magnetic rings on the power supply of the control board can help suppress conducted interference. If radiation interference is severe, such as near GSM or PHS base stations, add a metal mesh shield to the control board.
Additionally, adding an EMI filter at the inverter’s input can reduce interference to the power grid. Input AC and DC reactors improve the power factor and reduce harmonic distortion. When motor cables exceed 100 meters, an AC output reactor should be installed to prevent leakage current issues caused by distributed capacitance. Using shielded cables and connecting them properly to ground is also essential.
For analog signals, it's best to avoid using them if possible, especially over long distances or across cabinets. If necessary, use shielded cables and ground one end of the sensor or inverter side. In extreme cases, DC/DC isolation or optical isolation may be required.
Second, the working environment plays a critical role in the inverter’s longevity. Most inverters are installed directly in industrial sites, which can expose them to dust, high temperature, humidity, and corrosive gases. To protect the inverter, it should be placed inside a control cabinet, preferably in the center and vertically. Maintain at least 300mm clearance between the inverter and other components. Seal any unused ports with tape or dummy panels to prevent dust ingress. In dusty environments, ensure the control cabinet is well-sealed with proper ventilation, including protective nets and air filters.
Moisture and corrosion can damage internal components, so PCBs should be coated with anti-moisture paint, and structural parts should be nickel-chromed. Regular maintenance is also essential—cleaning dust, checking for discoloration, and inspecting capacitors and resistors.
Third, power quality impacts the inverter. High-impact loads like welding machines or arc furnaces cause voltage fluctuations, while multiple inverters can generate harmonics that pollute the grid. To address this, install reactive static compensation devices, use centralized rectification with a DC bus, or add passive LC filters or PFC units.
Finally, other factors include operating temperature, humidity, vibration, and exposure to corrosive gases. Ensure the inverter is installed in a cool, dry place, away from vibrations and direct sunlight. Use desiccants or heaters if needed, and avoid placing heat-generating components near the inverter. Always verify the input voltage and use a stabilizer if the power is unstable.
Proper installation, layout, parameter settings, and regular maintenance are all key to ensuring the inverter operates efficiently and lasts longer.
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