Regarding the grounding problem, it can generally be swept away after the following steps (because most of the inverters are not easy to detect the current measurement of Hall components, it is very important to sweep the grounding caused by external conditions.
Check the motor insulation, remove the lower outlet of the inverter, and use the shake meter to measure the insulation resistance with the cable.
Remove the inverter outlet, start the inverter at no load, and see if the current is 0, if it is not zero, consider the damage of the inverter's current measurement loop.
Replace the Hall component, test the machine, if the problem is not solved, further replace the board.
The first time is because the outgoing terminal inside the inverter is virtually connected, resulting in local overheating, and the cable skin is ablated and touches the inverter shell, forming a grounding problem, the second time is because the motor coil is burned, forming a grounding problem of the inverter, and the third time is because of the poor environment of the inverter The inverter reports a grounding problem caused by too much dust accumulation inside the inverter.
There are many causes of grounding problems. You're going to clean up the damage to the 1:IGBT. 2: Whether the insulation value of the motor is enough. 3: Is the cable in the inverter plugged in, 4: The possibility of bad current detection is also relatively large, etc.
1. The insulation of the motor winding is not good, and the motor is to the ground;
2. The cable is damaged to the ground;
3. The main board of the inverter is detected and damaged;
4. The inverter is broken;
5. Some inverters will have rectifier bridge breakdown, and they will also report ground problems;
6. Hall sensor is bad;
7. The short circuit of the trigger board circuit may be damp;
7. The power supply of the motherboard is damaged;
The common ones are 1, 2, 3, 5, 7
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