1) Investigation and investigation of problem phenomena. There are many kinds of inverter problem phenomena, for example, the same type of problem may have different problem phenomena, and different types of problems may have the same problem phenomenon, which brings difficulties to find the problem. However, the problem phenomenon is the basic basis for overhauling the inverter problem, and it is the starting point of the inverter problem maintenance, so it is necessary to carefully investigate and analyze the problem phenomenon, find out the most important and typical aspects of the problem phenomenon, and find out the time, place, and environment of the problem.
2) Understand the problem. Before starting to overhaul the inverter that causes problems, in addition to asking and understanding the situation before and after the inverter is damaged, it is also necessary to understand the phenomenon of the moment the problem occurs. For example, whether there has been smoke, abnormal noise, vibration, etc., but also to check whether others have disassembled and repaired and formed a "human problem".
3) Try the inverter to be repaired. The inverter that produces problems should be auditioned, audited, tried and other ways to deepen the understanding of the inverter problem. The maintenance sequence is: appearance viewing, power lead viewing and measurement, after no abnormality, turn on the power supply, press the corresponding switches, adjust the relevant knobs, and carefully listen to the sound and investigate whether there is any abnormal phenomenon in the inverter, and then analyze it according to the information it grasps, and identify the parts that may cause problems.
4) Problem finding. According to the schematic diagram of the inverter circuit and the wiring diagram of the printed circuit board, after analyzing the operating principle of the inverter and forming suspicious problems in the maintenance ideas, the corresponding position should be found on the printed circuit board, and the detection instrument should be used to conduct on-road or off-road tests, compare the measured data with the normal data, analyze and gradually narrow the scope of the problem, and finally find out the problem point.
5) Elimination of problems. After finding the problem, reasonable maintenance measures should be taken according to the characteristics of the failed components or other abnormal situations. For example, for dry detachment or virtual toughness, it can be done from scratch: for component failure, the qualified components of the same model standard should be replaced: for short-circuit problems, the cause of short-circuit should be found out and then the symptomatic clean-up.
6) Restore debugging, after replacing the components, the inverter should be fully or partially debugged, because even if the replaced components are the same, there will be differences in performance due to operating conditions or some parameters are not exactly the same, and some components themselves need to be adjusted. If it roughly fits the original parameters, it can be powered on for debugging, and if the inverter operation is fully restored to normal, it is clear that the problem has been eliminated: otherwise, it should be debugged from scratch until the inverter is fully restored to normal.
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