Abstract : This paper introduces the application and current operation status of frequency converters (VDCs) in polyester staple fiber winding devices. The main causes of winding shutdowns are analyzed as starting head tripping, winding roller tripping, and VDC malfunction tripping. Corresponding solutions are proposed. Keywords : Polyester staple fiber; winding; frequency converter. As a mature motor drive device, the frequency converter can continuously change the frequency and achieve stepless speed regulation. Vector control mode VDCs can effectively control constant magnetic flux and directly control torque, thereby controlling the balance of acceleration and achieving excellent dynamic performance. Simultaneously, frequency conversion speed regulation is a non-energy-consuming speed regulation method, achieving energy-saving effects. Although VDCs have many advantages and are an excellent AC electric drive method, widely used in AC speed control systems, their operational stability is becoming increasingly important. Our company is a chemical and textile integrated enterprise, and VDCs are widely used. In practice, the author has found that many frequency converters frequently experience tripping due to "overvoltage" and "overcurrent" faults during operation. One reason is the intense competition in the frequency converter market, especially for small, general-purpose frequency converters. To reduce costs, manufacturers have simplified components and control systems, resulting in decreased product performance and increased susceptibility to tripping faults when the load changes significantly. Another reason is that the frequency converter control system was not well-designed to match the production process and internal parameters of the frequency converter, leading to incomplete settings and frequent malfunctions during operation. These issues place higher demands on on-site technical support and maintenance engineers, increasing their workload. 1. Winding Process and Frequency Conversion Control Principle Our company currently has two short fiber production lines. The second short fiber production line was built in 2002, designed and equipped by Shanghai No. 2 Textile Machinery. The winding process uses a "6-roller + guide roller + feeder" method and is part of the Q452-24 type winding machine. Its process flow is shown in Figure 1. The cooled and solidified raw yarn from the Q442-24 spinning machine enters the Q452-24 winding machine for winding. Oil is applied to the yarn via double-sided oil rollers, and then the 24 yarns are combined into a single bundle (24 × 3046 = 73140 strands) by a straight rotor and a cylindrical rotor. The bundle is then fed into the yarn-holding drum of the yarn-holding device via an amplitude modulator, six winding rollers, guide rollers, and a feed roller. To reduce slippage on the winding rollers, rollers 6-1 and 6-5 are designed with grooved rollers to increase the yarn friction coefficient. The motors for these rollers are also more powerful (4.97 kW), while the motors for the other rollers have a rated power of 3.55 kW. A more advanced network winding head is used. [b][align=center]For more details, please click: A Brief Analysis of Frequency Conversion Control and Shutdown of Polyester Staple Fiber Winding Device[/align][/b]