The general installation environment requirements of the inverter: minimum ambient temperature -5 ° C, maximum ambient temperature of 40 ° C. A large number of studies have shown that the failure rate of the inverter increases 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 halved. In addition, the operation of the inverter is good, and it has a lot to do with the degree of environmental cleanliness. Summer is the period of frequent faults of the inverter. Only through good maintenance work can the equipment failure be reduced. Please pay attention to the temperature of the installation environment of the inverter during the maintenance of the high-voltage inverter in summer. Clean the inverter regularly. Internal dust ensures smooth cooling air. Strengthen inspections to improve the surrounding environment of inverters, motors and circuits. Check whether the terminals are tight, ensure the correct and reliable connection of each electrical circuit, and prevent unnecessary shutdown accidents. 1. Daily inspections need to pay attention to 1. Carefully monitor and record the display parameters on the human-machine interface of the inverter and find abnormalities. It 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. The temperature rise of the phase shifting transformer cannot exceed 130 °C
3. When the summer temperature is high, the ventilation and heat dissipation of the inverter installation site should be strengthened. Ensure that the surrounding air does not contain excessive dust, acid, salt, corrosive and explosive gases. 4. During the rainy season in summer, prevent rainwater from entering the inverter (for example, rainwater enters the air outlet)
5. The filter screen on the inverter door should be cleaned once a week. If the working environment is dusty, the cleaning interval should be shortened according to the actual situation. 6. In the normal operation of the inverter, a standard thickness of A4 paper should be firm. The adsorption is on the air inlet of the cabinet door. 7. The frequency conversion room must be kept clean and tidy, and should be cleaned at any time according to the actual situation on site.
8. The ventilation and lighting of the inverter room must be good. The ventilation and heat dissipation equipment (air conditioner, ventilation fan, etc.) can operate normally. 2. Items that need to be maintained after shutdown. 1. Clean the inside and outside of the inverter cabinet with a vacuum cleaner with a plastic nozzle to ensure the equipment. There is no excessive 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 internal cables of the inverter should be correct and reliable. 4. Check all the grounding in the inverter cabinet should be reliable. There is no rust at the grounding point. 5. Re-tighten the internal cables of the inverter every half year (inside). Connect the nut 6. The inverter will resume operation after a long time stop. The insulation of the inverter (including the phase shifting transformer and the main circuit of the bypass cabinet) should be measured. The 2500V megger should be used. After testing the insulation, the inverter can be started. 7. Check the tightness of all electrical connections. Check whether there are abnormal discharge marks in each circuit, whether there are strange smells, discoloration, cracks, damage, etc. 8. After each maintenance of the inverter It is necessary to carefully check for missing screws and wires to prevent short-circuit accidents caused by small metal objects. In particular, after making major changes to the electrical circuit, ensure that the electrical connection is properly connected and reliable, and prevent "reverse power transmission" accidents.