Once the power line is connected to the output (U, V, W) of the inverter, any one of the converters will be turned on due to the signal, and a short circuit will be formed. Therefore, when designing the main circuit of the inverter, it must be absolutely Avoid the possibility of power coming into the output.
The working principle of the inverter is to rectify the AC power into DC power through the rectifier bridge, and then invert it into three-phase AC power through the inverter circuit. Once the power line is connected to the output end (U, V, W) of the inverter, then any one The transmitting transistor is turned on by the signal, and a short circuit is formed, and the inverter tube is quickly burned out.
Inverted will burn the inverter tube, the new person must install the manual wiring, carefully study the instructions, do not casually electrify the power and burn the inverter. 
The following are the consequences of the reverse connection between the input and output of the voltage source type high voltage inverter.
One: consequences
When the high voltage input line is incorrectly connected to the isolation switch of the inverter, as long as the user switch is closed, the power frequency power supply from the high voltage bus will be directly connected to the power unit from the output end of the inverter. From the output terminal of the inverter to the inside of the inverter, the charge on the capacitor inside each unit is zero. The maximum allowable pressure drop of each phase is <±18V/DC, so there is no ability to withstand high voltages. In the case of a misconnection, the actual maximum of each phase moment is to bear the peak voltage of ±8164V. This voltage is much larger than the allowable values ​​of IGBTs, thyristors, and capacitors connected in parallel with the diodes in the cell, so that the series body of each phase cell becomes an equivalent pure conductor at a moment, since all the cells are connected in series To the neutral point, the current path is formed, and the path has no current limiting performance. The only current limitation can only come from the external user's relay system. Excessive current will cause an explosion of the freewheeling diode in the IGBT module, which causes the IGBT in the cell to explode with the diode while burning other components in parallel. In the process of explosion of components, the heat generated by the huge current will cause the cable and the joints in the above circuit to be deformed and even burned. At the same time, the huge short-circuit current will cause the upper user's trolley switch to trip at the same time, and the short-circuit damage will stop at this time, but at this time all the units have been damaged.
Since the inverter is connected to the high voltage when the high voltage input and the output are reversed, the phase shifting transformer of the actual input end of the inverter is connected to the motor, and the unit cannot be powered from the normal way. The control system of the unit has no working power. If the user does not enter the working state, the main control system cannot be alerted, so the computer of the main control system will not record the time and accident status of the accident.
Second: measures to prevent reversal:
1) After the installation and commissioning of the inverter device is completed, the input and output cables should be strictly distinguished and the identification should be done;
2) If the cable needs to be replaced, the position of the incoming and outgoing lines of the two cables must be distinguished, marked, and tested;
3) The work and test work of replacing the cable must be carried out by more than two personnel, and mutual inspection should be carried out, and if necessary, it should be checked and accepted by the electrical engineer;
4) Carefully check the inverter wiring identification. Generally, L1, L2, and L3 indicate the input, and U, V, and W are the outputs.
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