Very much, the inverter repair company in order to save maintenance costs, or many old inverter modules in the market is difficult to find new modules, generally use the old module instead, but when buying the module, it is true and false Identification also has a certain technical content.
Determining the quality of the module is also the key for the maintenance engineer to repair the inverter! First of all, you have to see if the module has been removed (see the appearance of traces), and now there are many modules that have been repaired, the parameters are normal but the quality is very poor! The withstand voltage value is the most important parameter. It can be measured with the withstand voltage meter. The output voltage of the inverter with input 380V is greater than 1000V, and 220V is 600V! The current can be compared with the capacitance meter to determine the size. At present, many untrustworthy suppliers wear out the labels of the small modules and then print the labels of the large modules. Therefore, the capacity of the capacitors is also the joint, and the true and false can be judged quickly. .
The IGBT module can also detect whether it can be operated by the pointer type multimeter 10K file, and use the pointer (black-red) to trigger the module G-E to make the module C-E turn on. When the G-E is shorted, then C- E off! This method is the simplest and most basic measurement method, which can be done by novice maintenance personnel. The professional one is not measured like this!
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