Due to the continuous development and advancement of power electronic technology, along with the introduction and improvement of new control theories, AC variable-speed drives, especially variable-frequency variable-speed drives with excellent performance, have developed rapidly. In recent years, the price of the frequency converter has been declining, but its use function has been continuously improved and expanded. It has now been widely used in the drive of some hundreds of watts of household appliances to some thousands of kilowatts of large industrial transmissions. AC variable frequency speed regulation has transitioned from being used only for speed regulation of fans and water pumps to being applied to various industrial sites requiring high-precision and fast response high-performance speed regulation indicators. The widespread use of frequency converters has achieved remarkable application effects in energy saving, labor saving, automation and productivity improvement, quality improvement, maintenance reduction and comfort improvement. However, the frequency converter is a new power electronic product that contains a variety of high and new technology in the past two decades. If you want it to play a good application effect, you must do in-depth research on its selection and configuration.

As an important AC speed control system, the frequency converter is used as the preferred transmission scheme in many occasions. While using the inverter, how to deal with it in time if a fault occurs? If you are not a professional maintenance person, how can you analyze the fault of the inverter?

Due to incorrect use or unreasonable setting environment, it will easily cause the inverter to malfunction and malfunction, or fail to meet the expected operating results. In order to prevent problems before they occur, it is particularly important to carefully analyze the causes of failures in advance.

The inverter is composed of the main circuit, power circuit, IPM drive and protection circuit, and cooling fan. Its structure is mostly unitized or modular. Due to incorrect use or unreasonable setting environment, it will easily cause the inverter to malfunction and malfunction, or fail to meet the expected operating results. In order to prevent problems before they happen, it is particularly important to carefully analyze the causes of failures in advance.

Overload is one of the more frequent faults of inverter tripping. Overload faults include variable frequency overload and motor overload, which may be caused by reasons such as too short acceleration time, excessive DC braking, too low grid voltage, and heavy load. Generally, it can be solved by extending the acceleration time, extending the starting time, and checking the grid voltage. I usually see the overload phenomenon, in fact, we should first analyze whether it is the motor overload or the inverter itself. Generally speaking, due to the strong overload capacity of the motor, as long as the motor parameters in the frequency converter parameter table are set properly, the overload is generally unlikely. However, the inverter itself is prone to overload alarm due to its poor overload capacity. We can detect the output voltage of the inverter, the current detection circuit and other easy points to eliminate the faults one by one.