When the inverter is not used after stopping for a period of time, when many users start to react, the inverter will burn the main board or the inverter explosion module when the inverter is powered on. In this case, we will analyze the possible causes of this situation in the maintenance of the inverter:
1. The motor returns to power due to inertia operation. The main output circuit and control circuit of the inverter are not isolated or completely isolated, causing the inverter main board or module to burn out. This is not the complete consideration of the inverter at the beginning of the complete set of electrical equipment design. The result of the working environment;
The solution is to disconnect the contactor after the inverter when the motor stops, and if possible, increase the brake holding mechanism of the motor. Therefore, the direction of the no-load voltage generated by the inertia of the motor is completely solved.
2. The interference of strong electricity causes the circuit board and the module to burn out. The specific reason is that the main circuit is close to the control circuit. Because of the harmonic action of the current, once the high voltage appears in the main circuit, the voltage of the control circuit will be made. Or current overload, thereby burning electrical components;
The solution is: the inverter fully considers the interference effect of the main circuit on the control circuit during design, try to avoid or minimize it, and the input main circuit adopts protective measures to avoid the impact of large current on the inverter.
3. Rainy weather is also likely to cause damage to the inverter due to lightning strikes, which is also caused by excessive input voltage;
The solution is to increase the lightning protection device on the equipment grid, and this problem can be completely solved.
These problems are actually the details of some inverter repairs. If you can consider these problems at the beginning of electrical equipment design, you can avoid unnecessary losses.
This article Source: Dry goods | Inverter repair burning motherboard and explosion module analysis
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