After the inverter has not been started for a long time, when it is started again, many users respond that the main board or the explosion module will be burned when the inverter is powered on. In this regard, we will analyze the possible causes of this situation in inverter maintenance
1. Due to the return current generated by the motor’s inertial operation, the main output circuit of the inverter is not isolated in time or completely from the control circuit, causing the main board or module of the inverter to burn out. This is because the working environment of the inverter is not fully considered when designing complete electrical equipment.
The solution is: when the motor stops, if it is possible to increase the brake holding mechanism, then disconnect the contactor behind the inverter.
2. The interference of strong electricity will cause the circuit board and module to burn. The specific reason is that the main circuit is close to the control circuit. Due to the harmonic effect of current, once the instantaneous high voltage appears in the main circuit, the voltage or current of the control circuit will be overloaded, thereby burning out the electrical components.
The solution is: when designing the inverter, the interference of the main circuit to the control circuit should be fully considered to avoid or reduce to the lowest level as possible. Input main circuit should take protective measures to avoid the influence of large current on the inverter.
3. The inverter is very likely to be damaged by lightning strike in rainy weather, the reason is also caused by excessive input voltage;
The solution is that in order to completely solve this problem, it is necessary to add lightning protection devices to the equipment grid.
These problems are actually some details of inverter maintenance. In the early design of electrical equipment, if these problems can be considered, unnecessary losses can be avoided.