The widescreen gives you a way to resolve the faulty repair of Emerson inverters
wide You analyze the Emerson frequency converter fault repair method, make the repair work. (1) Regularly (determine the length of the cycle interval according to the actual environment) to carry out comprehensive inspection and maintenance of the inverter, if necessary Decompose, inspect, measure, dust and fasten the circuit boards in the rectifier module, inverter module and control cabinet. Because the air inlet and the upper air outlet of the frequency converter are often blocked due to dust accumulation or excessive dust accumulation, the heat dissipation of the inverter is high, and the ventilation is required. Therefore, after running for a certain period of time, the circuit board (due to static electricity) has Dust must be cleaned and inspected. (2) After repairing the circuit board, busbar, etc., it is necessary to carry out the necessary anti-corrosion treatment, apply the insulating varnish, remove the burr from the busbar that has been partially discharged and arced, and conduct insulation treatment. . Insulation columns that have been insulated and must be removed for carbonization or replacement. (3) Check and fasten all the terminals to prevent the occurrence of severe heat generation due to looseness. (4) Perform comprehensive inspection and parameter measurement on the input (including output) terminal, rectifier module, inverter module, DC capacitor and fast-melting device, and find that devices with large burnout or large parameter changes should be replaced in time. (5) For the fan's internal rotation condition, always check carefully. After power off, turn the fan blades by hand to observe whether the bearing is stuck or inflexible. If necessary, replace the process. (6) Carefully inspect the electronic components on the control circuit board to inspect and handle abnormal phenomena such as desoldering, discoloration, bulging, cracking, disconnection (printing board wiring), and components that are abnormal when necessary. It can be removed from the board for measurement inspection or replacement. (7) Since the electronic components of the inverter are designed to take into account the capacity reduction caused by aging, it is not necessary to replace the capacitor with a small capacity reduction during maintenance. In practice, the reduction in capacitance capacity is directly related to the operating environment, load size, and working conditions of the inverter. The harsh environment, the larger the load, and the frequent shutdown, will 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 housing expands, bubbling or deforming, whether the safety valve is opened, and the capacitance and leakage current (large leakage current will overheat the capacitor). , causing safety valve to open, even capacitor explosion), withstand voltage, etc., for capacitors with a capacity reduction of more than 30%, leakage current exceeding 70mA, and withstand voltage below 650V should be 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 for testing and withstand voltage tests to determine the forward and reverse resistance values. And make a table record, the module with a large difference in parameters should be replaced. (9) Inspect the main contactor and other auxiliary relays, carefully observe whether the contactors of the contactors have arcing, burrs or surface oxidation, unevenness, and find such problems in response to their corresponding dynamic and static contacts. Replace it to ensure that its contact is safe and reliable. (10) Frequently check the degree of fluctuation of the power supply voltage. Improve the inverter environment and load fluctuations, and avoid the impact of large current on the inverter impact. In the application of the frequency converter, only the conditions that meet the design work requirements and normal use can be used for long-term, safe and stable operation. If it is used in a harsh working environment, it is necessary to pay more attention to the daily maintenance and overhaul of the inverter, and to improve the environment and load fluctuation of the inverter. In order to ensure that the inverter can perform its various functions reliably, smoothly and safely, it can achieve the purpose of speed regulation, energy saving and maintenance cost reduction.