VW3A4408軟啟動器施耐德
VW3A4408軟啟動器施耐德
VW3A4408軟啟動器施耐德
VW3A4408軟啟動器施耐德工作原理
VW3A4408軟啟動器施耐德選型手冊
VW3A4408軟啟動器施耐德中文說明書
VW3A4408電機軟啟動器(軟起動器)是一種集電機軟起動、軟停車、輕載節能和多種保護功能於一體的新穎電機控制裝置，國外稱為Soft Starter。
VW3A4408軟啟器採用三相反並聯晶閘管作為調壓器，將其接入電源和電動機定子之間。這種電路如三相全控橋式整流電路。
VW3A4408使用軟啟動器啟動電動機時，晶閘管的輸出電壓逐漸增加，電動機逐漸加速，直到晶閘管全導通，電動機工作在額定電壓的機械特性上，實現平滑啟動，降低啟動電流，避免啟動過流跳閘。
VW3A4408待電機達到額定轉數時，啟動過程結束，軟啟動器自動用旁路接觸器取代已完成任務的晶閘管，為電動機正常運轉提供額 定電壓，以降低晶閘管的熱損耗，延長軟啟動器的使用壽命，提高其工作效率，又使電網避免了諧波污染。
VW3A4408軟啟動器同時還提供軟停車功能，軟停車與軟啟動過程相反，電壓逐漸降低，轉數逐漸下降到零，避免自由停車引起的轉矩衝擊。
VW3A4408 The motor soft starter (soft starter) is a novel motor control device that integrates motor soft starting, soft parking, light load energy saving and multiple protection functions. It is called Soft Starter abroad.
VW3A4408 The soft starter uses three opposite parallel thyristors as a voltage regulator, which is connected between the power supply and the motor stator. This kind of circuit is like a three-phase fully controlled bridge rectifier circuit.
VW3A4408 When a soft starter is used to start a motor, the output voltage of the thyristor gradually increases and the motor gradually accelerates until the thyristor is fully conductive and the motor operates at the mechanical characteristics of the rated voltage to achieve smooth start, reduce the starting current and avoid starting overcurrent tripping.
VW3A4408 When the motor reaches the rated revolution, the starting process ends, and the soft starter automatically replaces the thyristor that has completed the task with a bypass contactor to provide the rated voltage for the normal operation of the motor, thereby reducing the heat loss of the thyristor and extending the service life of the soft starter. , improve its working efficiency, and prevent the power grid from harmonic pollution.
VW3A4408 The soft starter also provides a soft stop function. The soft stop process is opposite to the soft start process. The voltage gradually decreases and the number of revolutions gradually drops to zero to avoid the torque impact caused by free stop.
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