Mitsubishi inverter OC (overcurrent problem) will be caused by the following reasons, taking A500 series inverter as an example:
1). Caused by improper parameter setting problems, such as time setting is too short.
2). Caused by external elements, such as short circuit of motor winding, including phase-to-phase short circuit, short circuit to ground, etc.
3). Inverter hardware faults, such as Hall sensor damage, IGBT module damage, etc.
In maintenance, sometimes the above reasons may still be solved to solve the problem, OC problem still exists, of course, replacing the control board is not the solution to the problem, then you can consider whether there is a problem with the driving circuit. The detection circuit of the Mitsubishi A500 inverter is quite powerful, and any of the above detection points may alarm if there is a problem and cannot operate normally. In addition to the general drive circuit includes the drive power supply, drive optodecoupling isolation, drive signal method circuit, it also includes output signal feedback circuit. The detection direction mainly includes several components of the Mitsubishi drive circuit.
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