Selection of Start Mode of Centrifugal Pump Control

Centrifugal pump used in the cage motor configuration centrifugal pump control cabinet has a high starting current when starting.
    Motor power is less than 4kW, the centrifugal pump control cabinet starting mode using a direct closing circuit and soft starter. Motor power is greater than 4kW, the centrifugal pump control cabinet priority to use the star delta connection method, starting transformer, soft starter and inverter with the starting operation mode.
    Centrifugal pump control cabinet in the direct closing of the circuit, the motor winding end of the wrong connection into a triangular connection, so that the motor starts
The torque required to ensure mechanical rotation is instantaneously obtained. The complete unit will soon reach the normal operating speed.
    For motors. This turn-on method is most advantageous even when the starting current is increased to eight times the rated current. Because of the large capacity of the motor, this method will close the grid load soared, resulting in interference around the device voltage disturbance phenomenon wins, so the use of public low-voltage power grid (400V). Should be strictly abided by the power supply industry on the power is greater than 5.5kW when the direct operation of the provisions.