Variable frequency screw air compressors have been increasingly widely used in the air compressor industry due to their excellent and stable performance. However, the traditional variable frequency drive system of air compressors still has many drawbacks during installation and maintenance, such as complex wiring of the control circuit, time-consuming and laborious installation, and difficulty in finding the cause when faults occur. FGI Company independently developed the FD300 dedicated frequency converter for screw air compressors based on the development trend of the screw air compressor market. Its rich functions, flexible and simple application, and stable performance have been widely recognized by customers.

1.Introduction

The traditional variable frequency drive system for air compressors is generally composed of frequency converters, PLC controllers, operation panels, transformers, control switches and contactors, etc. However, there are the following drawbacks during installation and maintenance: the wiring of the control circuit is complex, installation is time-consuming and laborious, it is not convenient to find the cause when a fault occurs, and the overall aesthetics of the control cabinet is insufficient. This article will specifically introduce the application of the FD300 frequency converter in a certain permanent magnet synchronous air compressor in Zhejiang. The FD300 series of frequency converters is a product launched in response to the market demand for small power and small size. Adhering to the principle of being easy to use, user-friendly, dedicated and multi-functional, it can be widely applied in woodworking machinery, fans and pumps, food irrigation, ceramic machinery, textile machinery and other equipment.

2.The core function of the frequency converter in the air compressor

Traditional air compressors operate at a constant speed and cannot adjust their power according to the actual gas demand, resulting in high ineffective power consumption. The FD300 frequency converter regulates the motor speed in real time through PID control, achieving on-demand gas supply. This prevents the motor from operating at full load even under low load conditions, significantly reducing power waste. Combined with the automatic sleep function of the frequency converter, the equipment can suspend operation when the gas consumption is extremely low, further reducing energy consumption.

The FD300 frequency converter precisely controls the output pressure of the air compressor by adjusting the motor speed, meeting the precise air pressure requirements of different working conditions. Its closed-loop control technology can respond quickly to pressure fluctuations, ensure the stability of air pressure, and avoid pressure fluctuations caused by changes in valve opening in traditional valve regulation methods.

The frequency converter reduces the starting current of the motor through soft start technology, minimizing the impact on the mechanical system and avoiding the damage to the power grid and equipment caused by the instantaneous increase of current in the traditional starting method.

During operation, the motor speed can be dynamically adjusted according to the load, reducing the wear of mechanical components and thermal load, and extending the service life of the air compressor.

Traditional air compressors rely on regulating valves to control the output pressure, but throttling losses occur during the valve regulation process. The FD300 frequency converter directly controls the air supply volume by adjusting the motor speed, reducing the frequency of valve usage, lowering valve wear and energy loss.

3.TAG

The successful application of the FGI FD300 frequency converter in permanent magnet synchronous air compressors provides a more cost-effective frequency conversion system solution for air compressors. The streamlined control wiring reduces the failure points of air compressors, making the installation and maintenance of screw air compressors easy and fast. Under the further pursuit of the demand for high efficiency and energy conservation, the application of synchronous motors in air compressor systems is developing rapidly. The FGI FD30 frequency converter, with its powerful driving capacity and perfect control, is bound to lead the development of the air compressor industry.