When the three pairs of main contacts of the contactor KM1 are connected, the phase sequence of the three-phase power supply is connected to the motor according to ll-l2-l3. forward switching contactor KM1 and reverse switching contactor km2. Two contactors are used in the control circuit shown in the figure below, i.e. If any two of the incoming lines of the three-phase power supply of the motor are connected to each other, the reverse direction can be achieved.
Production machinery often requires that the moving parts can run in both positive and negative directions, which requires that the electric motor can run in both positive and negative directions.
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