QJ3 series manual operation auto-coupling step-down starting circuit

 The circuit is shown in Figure 3-47. Turn on the power switch os and push the operating handle to the "start" position. The three-phase AC power will
be reduced by the autotransformer and connected to the motor . After starting is completed, pull the operating handle to the "Run" position, the autotransformer
will exit operation, and the motor will be directly connected to the three-phase power supply for normal operation at full voltage. At this time, the trip coil YR reaches the electric suction table and
keeps the operating handle in the running position through the interlocking mechanism. When stopping, just press the stop button SB.