PST210-600-70 智能型软起动器 采用三相反并联晶闸管

☆型号：PST210-600-70 智能型软起动器 采用三相反并联晶闸管

【产品详情】

ABB智能型软起动器PST210-600-70 软启动器采用三相反并联晶闸管作为调压器，用这种电路如三相全控桥式整流电路，使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上，实现平滑启动，降低启动电流，避免启动过流跳闸，将其接入电源和电动机定子之间。电压由零慢慢提升到额定电压，这样电机在启动过程中的启动电流，就由过去过载冲击电流不可控制变成为可控制。并且可根据需要调节启动电流的大小。电机启动的全过程都不存在冲击转矩，而是平滑的启动运行。这就是软启动。

ABB智能型软起动器PST210-600-70 是一种集电机软起动、软停车、多种保护功能于一体的新颖电机控制装置，国外称为SoftStarter。它的主要构成是串接于电源与被控电机之间的三相反并联晶闸管及其电子控制电路。运用不同的方法，控制三相反并联晶闸管的导通角，使被控电机的输入电压按不同的要求而变化，就可实现不同的功能。软起动器和变频器是两种完全不同用途的产品。变频器是用于需要调速的地方，其输出不但改变电压而且同时改变频率；软起动器实际上是个调压器，用于电机起动时，输出只改变电压并没有改变频率。变频器具备所有软起动器功能，但它的价格比软起动器贵得多，结构也复杂得多。电动机软起动器是运用串接于电源与被控电机之间的软启动器，控制其内部晶闸管的导通角，使电机输入电压从零以预设函数关系逐渐上升，直至启动结束，赋予电机全电压，即为软启动，在软起动过程中，电机起动转矩逐渐增加，转速也逐渐增加。

ABB智能型软起动器PST210-600-70 采用三相反并联晶闸管作为调压器，将其接入电源和电动机定子之间。这种电路如三相全控桥式整流电路。使用软启动器启动电动机时，晶闸管的输出电压逐渐增加，电动机逐渐加速，直到晶闸管全导通，电动机工作在额定电压的机械特性上，实现平滑启动，降低启动电流，避免启动过流跳闸。待电机达到额定转速时，启动过程结束，软启动器自动用旁路接触器取代已完成任务的晶闸管，为电动机正常运转提供额定电压，以降低晶闸管的热损耗，延长软启动器的使用寿命，提高其工作效率，又使电网避免了谐波污染。软启动器同时还提供软停车功能，软停车与软启动过程相反，电压逐渐降低，转速逐渐下降到零，避免自由停车引起的转矩冲击。

☆型号：PST210-600-70 智能型软起动器 采用三相反并联晶闸管

【英文介绍】

ABB intelligent soft starter PST210-600-70 soft starter uses three opposite parallel thyristors as voltage regulator, with this circuit such as three-phase fully controlled bridge rectifier circuit, using the soft starter to start the motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully switched on. The motor works on the mechanical characteristics of the rated voltage to achieve smooth starting, reduce the starting current, avoid starting overcurrent tripping, and connect it between the power supply and the motor stator. The voltage is slowly raised from zero to the rated voltage, so that the starting current of the motor in the starting process will be controllable from the past overload impulse current. And the size of the starting current can be adjusted according to needs. There is no impact torque in the whole process of motor start-up, but smooth start-up operation. This is a soft boot.

ABB intelligent soft starter PST210-600-70 is a novel motor control device that integrates soft start, soft stop and a variety of protection functions. It is called SoftStarter abroad. It is mainly composed of three opposite parallel thyristors and electronic control circuits connected in series between the power supply and the controlled motor. Different functions can be realized by using different methods to control the conduction Angle of the three opposite parallel thyristors so that the input voltage of the controlled motor can be changed according to different requirements. Soft starters and frequency converters are two completely different products. The frequency converter is used where speed regulation is required, and its output not only changes the voltage but also changes the frequency. The soft starter is actually a voltage regulator, used when the motor starts, the output only changes the voltage and does not change the frequency. The frequency converter has all the functions of the soft starter, but its price is much more expensive than the soft starter, and the structure is much more complex. The motor soft starter uses a soft starter connected in series between the power supply and the controlled motor to control the conduction Angle of its internal thyristor, so that the input voltage of the motor gradually rises from zero with a preset function relationship until the end of starting, giving the motor full voltage, that is, soft starting. In the process of soft starting, the starting torque of the motor gradually increases, and the speed also gradually increases.

ABB smart soft starter PST210-600-70 uses three opposite shunt thyristors as voltage regulator, which is connected between the power supply and the motor stator. This circuit is such as three-phase full control bridge rectifier circuit. When the soft starter is used to start the motor, the output voltage of the thyristor gradually increases, and the motor gradually accelerates until the thyristor is fully switched on, and the motor works on the mechanical characteristics of the rated voltage to achieve smooth starting, reduce the starting current, and avoid starting overcurrent trip. When the motor reaches the rated speed, the start process ends, and the soft starter automatically replaces the thyristor that has completed the task with a bypass contactor to provide rated voltage for the normal operation of the motor, so as to reduce the heat loss of the thyristor, extend the service life of the soft starter, improve its work efficiency, and avoid harmonic pollution in the power grid. The soft starter also provides a soft parking function, which is the opposite of the soft starting process, the voltage is gradually reduced, the speed is gradually reduced to zero, and the torque impact caused by free parking is avoided.

☆型号：PST210-600-70 智能型软起动器 采用三相反并联晶闸管

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