1. Overpressure leads to brake pipe breakdown.
The so-called overvoltage of the inverter refers to the fact that the inverter voltage formed due to various reasons exceeds the additional voltage, which is concentrated in the DC voltage of the inverter DC bus.
The overvoltage alarm generally appears at the time of shutdown, and the main reason is that the deceleration time is too short or there is a problem with the braking resistance and braking unit.
Example: A Taian N2 series 3.7kW inverter jumps "OU" when it is stopped.
Situation: When repairing this machine, we focused on the braking circuit, and the discharge resistance measurement found no problems. However, when measuring the brake pipe (ET191), it was found that it had broken down, and after replacing it, it was powered on and running, and there was no problem with quick stopping.
Conclusion: Inverter overvoltage is one of the factors that lead to inverter breakdown.
2. Excessive surge voltage leads to insulation breakdown.
Cause: A surge voltage occurs when the resonance of the distributed capacitance and distributed inductance on the output line is superimposed on the output voltage. The higher the switching frequency of transistors and IGBTs, the longer the wiring, the higher the surge voltage, and at the maximum, the surge voltage can be twice the DC voltage.
Solution: Use a motor with high dielectric strength plus an AC output reactor (impedance of 3%) plus an output inductance L, capacitance C, resistance R filter.
3. The load of the inverter is suddenly disconnected, resulting in the breakdown of the module.
Reason: A contactor is installed at the output end of the inverter
Principle: During the normal operation of the inverter, the sudden and large reduction of the load at the output will constitute a huge reverse electromotive force, which will have an effect on the inverter, and when the electromotive force is large enough, it will lead to the breakdown of the module and even the formation of an explosion.
For example, if the load is suddenly disconnected during the normal operation of the inverter, the motor with a large inductance will have a self-induced electromotive force, and it will be superimposed in the same direction with the power supply voltage (the voltage output by the inverter) to form a high voltage, and the voltage at both ends of the IGBT that is turned on has a small effect, but it will cause an overvoltage at both ends of the IGBT in reverse cut-off, and if the voltage is large enough, it will break down the IGBT.
Solution: Do not install a contactor at the output end of the inverter, and keep the inverter load so that it does not suddenly fall into the load.
Fourth, three-phase rectification full breakdown
Example: A customer repaired the inverter, and found that the three-phase rectifier broke down when he checked it, and the missing phase detection plate was seriously burned out by the way. The inverter part and the other parts are normal.
Speculation is that the input varistor is not broken, and it is clear that the power supply is a problem caused by the impact caused by excessive current.
In addition to the above four situations, we will also encounter many problems about inverter breakdown (such as: inverter CPU breakdown) in daily use, in addition to the above listed reasons, there are also external inducements such as environmental humidity, metal dust and other inducements that cause inverter breakdown, and these problems need to be further considered.
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