Furthermore, the cleanliness of the environment also greatly affects the proper operation of high-voltage frequency converters. Summer is a peak season for high-voltage frequency converter failures; only through proper maintenance can equipment malfunctions be reduced. Users are urged to pay close attention.
During summer maintenance of high-voltage frequency converters, attention should be paid to the temperature of the installation environment. Dust inside the converter should be cleaned regularly, and unobstructed cooling airflow should be ensured. Regular inspections should be conducted, and the surrounding environment of the frequency converter, motor, and wiring should be improved. All tightness should be checked to ensure correct and reliable connections of all electrical circuits, preventing unnecessary downtime.
Maintenance and care precautions for high voltage frequency converters
1. Carefully monitor and record all displayed parameters on the inverter's human-machine interface, and report any abnormalities immediately.
2. Carefully monitor and record the ambient temperature of the frequency converter room. The ambient temperature should be between -5℃ and 40℃. The temperature rise of the phase-shifting transformer must not exceed 130℃.
3. During periods of high summer temperatures, ensure adequate ventilation and heat dissipation at the inverter installation site. Ensure the surrounding air is free of excessive dust, acids, salts, corrosive gases, and explosive gases.
4. Summer is the rainy season, so prevent rainwater from entering the inverter (e.g., rainwater entering through the air duct outlet).
5. The filter screen on the inverter cabinet door should usually be cleaned once a week; if the working environment is dusty, the cleaning interval should be shortened according to the actual situation.
6. During normal operation of the frequency converter, a standard thickness A4 sheet of paper should be able to adhere firmly to the air inlet filter screen of the cabinet door.
7. The frequency converter room must be kept clean and tidy, and should be cleaned regularly according to the actual site conditions.
8. The frequency converter room must have good ventilation and lighting, and the ventilation and heat dissipation equipment (air conditioner, ventilation fan, etc.) must be in normal operation.
High-voltage frequency converter maintenance projects
1. Thoroughly clean the inside and outside of the inverter cabinet with a vacuum cleaner with a plastic nozzle to ensure that there is no excessive dust around the equipment.
2. Check the ventilation and lighting equipment in the frequency converter room to ensure that the ventilation equipment is operating normally.
3. Check that the connections between the internal cables of the frequency converter are correct and reliable.
4. Check that all grounding within the inverter cabinet is reliable and that there is no rust at the grounding points.
5. Tighten all connecting nuts of the internal cables of the frequency converter every six months.
6. After a long period of shutdown, the inverter should be restarted with the insulation measured using a 2500V megohmmeter (including the phase-shifting transformer and the main circuit of the bypass cabinet). The inverter can only be started after the insulation test is passed.
7. Check the tightness of all electrical connections, and inspect each circuit for any abnormal discharge traces, strange odors, discoloration, cracks, damage, or other abnormalities.
8. After each inverter maintenance, carefully check for any missing screws and wires to prevent short circuits caused by small metal objects. Especially after significant modifications to the electrical circuit, ensure that electrical connections are correct and reliable to prevent backfeeding accidents.
