The operator must be familiar with the basic working principle and function characteristics of the inverter and have common knowledge of electrician operation. Before routine maintenance of the inverter, it must be ensured that the total power supply of the equipment is completely cut off; and after the inverter shows complete disappearance for 3-30 minutes (according to the power of the inverter). Should pay attention to check the grid voltage, improve the surrounding environment of the inverter, motor and circuit, regularly remove the dust inside the inverter, and minimize the failure rate of the inverter by strengthening equipment management.
(1) Cooling fan
The power module of the frequency converter is the most heat-generating device, and the heat generated by its continuous operation must be discharged in time. The life of the general fan is about 20kh ~ 40kh . It is necessary to replace the fan once every 3 to 5 years according to the continuous operation of the inverter to avoid malfunction caused by poor heat dissipation.
(2) Filter capacitor
Intermediate circuit filter capacitor: also known as electrolytic capacitor, the role of this capacitor: filter out the rectified voltage ripple, and also decoupling between the rectifier and the inverter to eliminate mutual interference, but also provide the necessary motor The power is subject to extremely large pulse current, so the service life is short. Because it needs to store energy during operation, it must be energized for a long time. The heat generated by its continuous operation plus the heat generated by the inverter itself will accelerate its electrolyte. Dryness directly affects the size of its capacity. Under normal conditions, the life of the capacitor is 5 years. It is recommended to check the capacitance capacity once a year regularly. Generally, the capacity should be replaced by more than 20% .
(3) Use of preservatives
Due to the production characteristics of some companies, the concentration of corrosive gases in each electrical mcc chamber is too large, causing many electrical equipment to be damaged by corrosion (including inverters). In order to solve the above problems, an air conditioning system can be installed to improve the environmental conditions with positive pressure fresh air. In order to reduce the corrosion of corrosive gases on the components on the circuit board, the inverter manufacturer can also be required to carry out anti-corrosion processing on the circuit board, and also spray preservatives after maintenance, which effectively reduces the failure rate of the inverter and improves the use efficiency. .
At the same time of maintenance, the inverter should be carefully checked, and the power should be sent periodically. The motor should be operated at a low frequency of 2hz for about 10 minutes to ensure that the inverter works normally.
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