What Is The Control Principle Of The Water Pump Star Delta Control Cabinet?

Sep 06, 2024

On the control cabinet drawing, 1/L2/L3 respectively represent three phase wires; QS stands for air switch; Fu1 represents the fuse on the main circuit; Fu2 represents the fuse on the control circuit; SP stands for stop button; ST represents the start button; KT represents the coil of the time relay, and the suffix numbers indicate its different contacts; KMy represents the coil of the star contactor, and the suffix numbers indicate its different contacts; KM △ represents the coil of the star delta control cabinet contactor, and the suffix number represents its different contacts; KM represents the coil of the main contactor, and the suffix numbers indicate its different contacts; U1/V1/W1 respectively represent the three identical terminals of the motor winding; U2/V2/W2 respectively represent the other three identical terminals of the motor winding; Close QS, press St, KT, KMy to activate. KMY-1 is closed, KM is powered on and activated; KMY-2 is closed, the motor coil is in star connection, KMY-3 is disconnected to avoid KM △ misoperation; KM-1 closed, self-protection start button; KM-2 is ready to work as a triangle when closed; KM-3 is closed, the motor is powered on and running, in a star starting state. After the delay of the time relay is reached, the delay contact KT-1 is disconnected, the KMy coil is powered off, KMY-1 is disconnected, and KM is still energized and closed through KM-2; KMY-2 is disconnected to prepare for the triangular connection of the motor coil; KMY-3 is closed, allowing KM △ to be electrically attracted; KM △ -1 is disconnected, stopping the power supply to the time relay coil; KM △ -2 is disconnected to ensure that KMY cannot be powered and misoperated: KM △ -3 is closed when the motor coil is in a triangular operation state. The triangular operation state of the star delta control cabinet requires pressing the SP button to cause all contactor coils to trip off and stop running.