Siemens 6ES7322-1BH01-0AA0 power module
By comparing various starting methods of asynchronous motors: when the motor starts at full voltage, the impact on the power grid is also long, and the impact time is also long; The commonly used step-down start, also known as hard start, has a relatively small impact on the power grid, but due to the involvement of a coil voltage switching process, there is a disadvantage of secondary impact; Soft start, due to the setting of a starting current that does not affect the power grid before starting, slowly increases to the set current, so there is no surge current, which has an impact on the power grid and can eliminate the impact of starting torque. By using a soft starter connected in series between the power supply and the controlled motor, the conduction angle of the internal thyristor is controlled, so that the input voltage of the motor gradually increases from zero in a preset functional relationship until the start is completed, and the motor is given full voltage, which is called soft start. According to the different needs of different industries, there are also different requirements for the starting method of soft starters. Generally, there are several methods: ramp boosting soft start. This starting method is simple and does not have current closed-loop control. It only adjusts the conduction angle of the thyristor to increase it in a certain functional relationship with time. Its disadvantage is that due to the lack of current limitation, during the motor starting process, sometimes a large surge current is generated, causing damage to the thyristor and having a significant impact on the power grid, which is rarely applied in practice.
The difference between soft start and general step-down start is that reducing the voltage applied to the stator winding of the motor can reduce the starting current of the motor. General step-down starting refers to the sudden change in voltage applied to the stator winding of an electric motor during the starting process, mainly including Y-△ step-down starting and self coupled transformer step-down starting; Soft start is the use of a voltage regulating device to automatically increase the starting voltage continuously and smoothly within the specified starting time, until it reaches the rated voltage. If a general step-down start is used, the starting process is jumping and not smooth, so it is also called a hard start. It is not suitable for situations that require stable starting in production processes.
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Xiamen Xingruijia Import and Export Co., Ltd.’s product content includes distributed control systems (DCS), programmable logic controllers (PLC), MOTOROLA MVME industrial modules, industrial control communication converters (Anybus), remote output/input modules (RTU), industrial computers (IPC), industrial low-frequency screens (IPC), human-machine interface SCSI (50, 68, 80Pin), AnyBus (Gateway), which has become a global sales enterprise for industrial automation spare parts and components
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The company has a leading advantage in discontinuing control system components. We have a large inventory and surplus of control system components, as well as some hardware for the discontinued control system. We have also released many new hardware and products to support your existing control system or apply new control technologies. The discontinued “DCS system spare parts, PLC module spare parts,” complete machine and accessory series have a strong advantage. As long as you need PLC products, we can help you find them. The company has a great price advantage
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ABB Robots, FANUC Robots, YASKAWA Robots, KUKA Robots, Mitsubishi Robots, OTC Robots, Panasonic Robots, MOTOMAN Robots, etc
Allen Bradley Automation is a global strategic brand of Rockwell Automation, providing customers with a complete set of components, products, control and information platforms, as well as support services and manufacturing solutions.
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