With the development of science and technology, the background of frequency conversion technology is the wide demand of AC motor stepless speed regulation. The traditional DC speed regulation technology is limited because of its large size and high failure rate. Entered in twenty-first Century, the domestic inverter gradually rise, has gradually seize the high-end market. Shanghai and Shenzhen become the forefront of domestic inverter development. Then, when the frequency converter fails, how should we diagnose and maintain it? The following explains the inverter fault diagnosis and maintenance:

1、Rectifier module damage

Usually due to grid voltage or internal short-circuit. Replace the rectifier bridge in case of an internal short circuit. When dealing with failures on the spot, we should check the situation of the users'' power grid, such as the voltage of the power grid, the electric welding machine and so on.

2、Inverter module damage

Usually due to motor or cable damage and drive circuit failure. After the drive circuit is repaired, the drive waveform is measured and the module is replaced in good condition. After replacing the drive panel in the field service, be careful to check the motor and the connecting cable. The inverter can be run without any fault.

3、Power on display

Usually due to the damage of the switching power supply or the damage of the soft charging circuit, no direct current is caused by the direct current circuit. If the starting resistor is damaged, the operation panel is damaged, and the same happens.

4、Display overvoltage or undervoltage

Usually due to the lack of input phase, the aging of the circuit and the damp of the circuit board. The solution is to find out the voltage detection circuit and the detection point and replace the damaged devices.
Fault diagnosis and maintenance of the inverter is here to share, Chinese in high voltage inverter market has broad space for development, with the diversification of the expansion of the market and user demand, domestic inverter product function in continuous improvement and increase the degree of integration and systematization, more and more high.