Measures to reduce inverter faults and prolong service life - News - Global IC Trade Starts Here.

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According to the experiment, the service life of the inverter is reduced by half for every 10 °C increase in ambient temperature. For this reason, in daily use, a reasonable maintenance cycle and system should be formulated according to the actual use environment conditions and load characteristics of the inverter. After each use cycle, the inverter should be completely disassembled, inspected, measured, etc. Make hidden faults discover and process at an early stage.
(1) Periodically (determine the length of the cycle interval according to the actual environment) Perform comprehensive inspection and maintenance on the inverter. If necessary, disassemble, inspect, measure, dust and fasten the circuit boards in the rectifier module, inverter module and control cabinet. Because the lower air inlet and the upper air inlet of the frequency converter are often blocked due to dust accumulation or excessive dust accumulation, the heat dissipation amount is high, and the ventilation amount is required. Therefore, after running for a certain period of time, the circuit board (due to static electricity) has accumulated. Dust must be cleaned and inspected.
(2) After repairing the circuit board and busbar, it is necessary to carry out the necessary anti-corrosion treatment to apply the insulating varnish. For the busbars where partial discharge and arcing have occurred, the burrs must be removed and insulated. Insulation columns that have been insulated and must be removed for carbonization or replacement.
(3) Check and tighten all terminals to prevent the occurrence of severe heat generation caused by looseness. (4) Thoroughly inspect large devices. Input (including output) terminals, rectifier modules, inverter modules, DC capacitors and fast-melting After the device is thoroughly inspected and parameterized, it is found that the device with burnt or large parameter changes should be replaced in time.
(5) Always check the rotation of the fan inside the inverter. After turning off the power, turn the fan blades by hand to observe whether the bearing is stuck or inflexible. If necessary, replace the process. (6) Carefully check the electronic components on the control circuit board. The device checks and handles abnormal phenomena such as desoldering, discoloration, bulging, cracking, and disconnection (printing board wiring). If necessary, components with abnormal external appearance can be removed from the board for measurement and inspection or replacement.
(7) Maintenance of electrolytic capacitors Since the electronic components of the inverter are designed in consideration of the capacity reduction caused by aging, it is not necessary to replace the capacitors with reduced capacity immediately during maintenance. In practice, the reduction in capacitance capacity is directly related to the operating environment, load size, and working conditions of the inverter. Operating conditions such as harsh environments, large loads, and frequent shutdowns accelerate the aging of the DC main capacitor. In addition, during regular maintenance, it is necessary to check in detail whether the main DC circuit capacitor leaks, whether the casing expands, bubbling or deforming, whether the safety valve is opened, and the capacitance and leakage current (the leakage current causes the capacitor to overheat, causing Safety valve is opened, even capacitor explosion), withstand voltage, etc., and capacitors with a capacity reduction of more than 30%, leakage current exceeding 70ma, and withstand voltage lower than 650v are replaced in time. For new capacitors or unused capacitors that have been unused for a long time, performance tests should be performed to meet the requirements for use.
(8) For devices with large current carrying capacity such as rectifier block and inverter gtr (or igbt), use multimeters, bridges and other instruments and tools to test and withstand voltage test, determine the forward and reverse resistance values, and make a table. Record, replace the module with large difference in parameters.
(9) Check the main contactor and other auxiliary relays, carefully observe whether the contact static and dynamic contacts of the contactors have arcing, burrs or surface oxidation, unevenness, and find that such problems should be replaced by their corresponding dynamic and static contacts to ensure Its contact is safe and reliable.
(10) Frequently check the fluctuation of the power supply voltage, improve the use environment of the inverter and the fluctuation of the load, and avoid the impact of large current on the impact of the inverter.