Complete device with soft starter for medium voltage KU UPP
The principle of operation of the soft starter
The voltage is controlled by thyristors. This control provides voltage regulation at the motor terminals from the initial level to the supply voltage. Thereby, the optimal starting current and the starting acceleration moment for a specific application are regulated.
After a smooth start of the motor, the bypass contactor closes and the soft starter is turned off. When the “Stop” or “Alarm” signal appears, it switches back from the bypass contactor to the soft starter and the motor stops smoothly.