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The conduction characteristic of the thyristor is controlled by the thyristor, and the conduction angle of the internal thyristor is controlled. When the motor is started, the power supply of the motor is controlled by adjusting the conduction angle of the thyristor.
The so-called soft start refers to the process that the output voltage of the device rises according to a certain law, so that the voltage of the controlled motor has a smooth acceleration from zero to the rated speed corresponding to zero to full voltage. It is a combination of power electronics technology and automatic control technology. It is a control technology that combines strong electricity with weak points. In the soft starter, a three-phase parallel thyristor is connected in series between the three-phase power supply and the controlled motor, and the conduction state of the thyristor is controlled by the thyristor, and the conduction angle of the internal thyristor is controlled. When the motor is started, the motor is controlled by adjusting the conduction angle of the thyristor. Power supply.
The starting voltage is adjustable to ensure the minimum starting torque of the motor starting, avoiding motor overheating and energy waste, controlling the smooth start of the motor, reducing the starting current impact, starting current can be adjusted according to the load condition to reduce the starting loss, and the best current is generated with the minimum current. The torque starting time is adjustable. During this time range, the motor speed gradually rises, avoiding the speed shock to protect the transmission machinery, clear the torque surge and reduce the inrush current, constant acceleration and deceleration, no need for a tachometer, even when the motor load changes. The same is true, free parking and soft parking are optional, soft parking can be adjusted slowly, with phase sequence, phase loss overheating, over-current during startup, over-current and overload detection and protection during operation, and over-current and overload values ​​adjustable
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