Inverter general installation environment requirements: minimum ambient temperature -5 °C, maximum ambient temperature 40 °C. A large number of studies have shown that the failure rate of the inverter rises exponentially with increasing temperature, and the service life decreases exponentially with increasing temperature. When the ambient temperature rises by 10°C, the service life of the inverter will be reduced by half. In addition, the operation of the inverter is good and has a great relationship with the degree of environmental cleanliness. In the summer, it is the frequent occurrence period of the inverter fault. Only through good maintenance and maintenance can the equipment failure be reduced. Please pay attention to the user's attention to the temperature of the inverter installation environment in the maintenance of high-voltage inverter in summer, and regularly clean the inverter. Internal dust ensures smooth cooling air ducts. Strengthen inspections to improve the surrounding environment of inverters, motors and lines. Check the tightness of the terminal blocks to ensure the correct and reliable connection of each electrical circuit, to prevent unnecessary shutdown accidents. 1. Daily Inspection Note: 1. Carefully monitor and record the display parameters on the inverter's man-machine interface and find abnormalities. Should be reflected immediately 2. Carefully monitor and record the ambient temperature of the inverter room. The ambient temperature should be between -5°C and 40°C. Temperature rise of phase-shifting transformers cannot exceed 130°C
3. When the summer temperature is high, the ventilation and heat dissipation at the installation site of the inverter shall be strengthened. Ensure that the surrounding air does not contain excessive amounts of dust, acids, salts, corrosive and explosive gases. 4. In summer, it is a rainy season. Prevent rainwater from entering the inverter (for example, the rain enters the air outlet of the inverter).
5. The filter on the frequency converter cabinet door should usually be cleaned once a week; if there is more dust in the working environment, the cleaning interval should also be shortened according to the actual situation. 6. In the normal operation of the inverter, a standard thickness of A4 paper should be strong Adsorption on the door inlet filter net 7. The frequency conversion room must be kept clean and tidy. It should be cleaned at any time according to the actual situation on site.
8. The ventilation and lighting of the frequency conversion room must be good. The ventilation and heat dissipation equipment (air conditioner, ventilation fan, etc.) can function normally. 2. The items needing maintenance after shutdown. 1. Thoroughly clean the inside and outside of the inverter cabinet with a vacuum cleaner with plastic suction nozzle to ensure the equipment. There is no excess dust around.
2. Check the ventilation and lighting equipment of the inverter room to ensure that the ventilation equipment can operate normally.
3. Check the connection between the cables inside the inverter should be correct and reliable. 4. Check that all the grounding in the inverter cabinet should be reliable, and the grounding points should not be rusted. 5. Every time in half year (inside), the internal cables of the inverter should be fastened once again. The connection nut 6 and the inverter shall resume operation after a long shutdown. The insulation of the inverter (including the phase-shifting transformer and the main circuit of the bypass cabinet) shall be measured. The 2500V megohmmeter shall be used. After the test insulation is qualified, the inverter 7 can be started to check the tightness of all electrical connections. Check whether there are abnormal discharge traces on each circuit, whether there are strange smells, discoloration, cracks, breakage, etc. 8. After each maintenance of the inverter , to carefully check for missing screws and wires, etc., to prevent short circuit accidents caused by small metal objects. In particular, after major changes to the electrical circuit, ensure that the electrical connection is connected correctly and reliably to prevent the occurrence of "reverse transmission" accidents.
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