Inverter fault repair - Schneider

Create Date: 2024-8-30 12:03:23|Source: Schneider/Schneider

To repair the output board driven by the inverter, we must first investigate whether the components on the PCB board are burned out, replace them first, and then analyze what causes the burned out and deal with this problem.

Inverter fault repair - Schneider

Then measure the IGBT module, confirm whether the module has a short circuit problem when it is not energized, and whether the voltage drop of the three-phase input and output to the rectifier bridge output 0V and + (diode gear voltage drop) is fundamentally the same, if the voltage drop difference is too large, to check the corresponding circuit.

After doing the above operations, the inverter is not loaded, and a 60W bulb is connected to the power supply with a blocking power string to check the working status:

If it is always on, it means that the circuit is still damaged, and this problem should be eliminated first;

If the bulb does not shine, it means that the circuit is not working, and you should check whether the starting resistor is burned out, and the switching power supply may not work.

If the starting resistance and switching power supply detection are normal, then what we need to do is to measure whether the DC voltage on the filter capacitor is normal.

If the voltage is too low, you should check the filter capacitor, test the output voltage of a set of switching power supply, and make sure that the switching power supply is working normally, otherwise the switching power supply should be repaired.

These are normal, you can test the inverter under working conditions, adjust the frequency of the inverter from 0 to the maximum value of 50Hz, and measure whether the three-phase output no-load voltage can rise from 0V to the maximum (the output voltage of the output 200V level should be up to 200V 50Hz, and the output of the 380V level should be 380 50Hz).

If it is too low, you should check the filter capacitance, and whether the voltage of the three phases is equal at the same time point (three-phase balance);

If it is unbalanced, look at the optocouplers and their power supply and drive circuits for the upper and lower tubes.

I am sure that after reviewing these steps, I will finally add the load to test the machine for a few minutes, confirm the three-phase output current balance, and whether the output voltage is flat (within 1V difference) and there is no alarm code, so that the repair is completely completed.

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