Frequency sensitive resistor starting and wound rotor type induction motor automatic reversing circuit

Published:2011/7/5 9:59:00 Author:John | Keyword: induction motor, wound rotor, Frequency sensitive resistor | From:SeekIC

As for the shown figure, the forward starting button STF is pressed to lead the coil KMF to be energized. And the motor is connected to frequency sensitive resistor in series for starting. At the same time, the relay KT starts to timing. When the setting time lKT is reached, its normally opening momentary contact closes. Then the contactor KM suctions to be self-protected. Meanwhile, the KT coil circuit is cut. KM’s main contacts will short the L and the motor runs into full-voltage operation. Press the STP and the motor stops. The operating principle of inversing operation is the same.



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