Frequency converters often operate in environments with high temperature, high humidity, high dust, corrosive gases, and vibration. Furthermore, frequency converters have a long service life and have not undergone major overhauls or maintenance.
The environmental requirements for inverter installation are readily apparent from years of experience.
The impact of the installation environment on the frequency converter is as follows:
1. Operating temperature. The inverter contains high-power electronic components, which are highly susceptible to the influence of operating temperature. The product generally requires a temperature range of 0 to 55°C, but to ensure safe and reliable operation, a margin should be considered when using it, and it is best to keep it below 40°C.
2. Ambient temperature. When the temperature is too high or fluctuates greatly, condensation is likely to occur inside the frequency converter, which will greatly reduce its insulation performance and may even cause a short circuit.
3. Corrosive gases. If the concentration of corrosive gases in the operating environment is high, it will not only corrode the leads of components and printed circuit boards, but also accelerate the aging of plastic components and reduce their insulation performance.
4. Vibration and shock. Mechanical vibration and shock can cause poor electrical contact in control cabinets equipped with frequency converters. 5. Prolonged low-speed operation leads to higher motor heat generation and reduced fan cooling capacity.
Installation recommendations for current frequency converters:
1. Improve the operating environment of the frequency converter:
1) Unify the installation of existing frequency converters in the field, build a frequency converter room, improve the working environment, and install ventilation devices to minimize the ambient temperature. If the ambient temperature is 10℃ higher, the lifespan will be reduced by half. Partially replace existing motors, such as the motor in the large tank of Workshop 107, with frequency converter motors for experimental purposes.
2) Seal off the main dust inlets of the inverter distribution cabinet and install a ventilation system.
2. Maintain the status quo and strengthen the daily inspection, maintenance, and overhaul of frequency converters on the existing basis.
1) Routine inspection of the frequency converter should be carried out every two weeks. Check and record the three-phase output voltage of the frequency converter during operation, and pay attention to comparing their balance; check and record the three-phase output current of the frequency converter, and pay attention to comparing their balance; check and record the ambient temperature and radiator temperature; check for any abnormal vibrations or noises of the frequency converter, and whether the fan is operating normally.
2) Inverter Maintenance: Each inverter should undergo dust removal and maintenance once per quarter. Maintenance involves removing accumulated dust and dirt from the inside of the inverter and its air ducts, and wiping the inverter surface clean; the inverter surface should be kept clean and shiny. During maintenance, carefully inspect the inverter for any overheating or discoloration, cracked cement resistors, bulging or leaking electrolytic capacitors, protruding explosion-proof holes, or any abnormalities on the PCB board, including any overheated or burnt areas. After maintenance, restore the inverter's parameters and wiring, power it on, and run the motor at a low frequency of 3Hz for approximately 1 minute to ensure the inverter is operating normally.
3) Inverter Overhaul: The specific overhaul items for the inverter are mainly determined based on the inverter's service life and the results of routine inspections. Electrolytic capacitors: standard lifespan is 5 years; fans: standard lifespan is 2-3 years.
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