1. Check the power wiring.

The forward and reverse rotation of a single-phase motor is determined by the power supply wiring. If the power supply wiring is incorrect, it can cause the single-phase motor to rotate in the opposite direction. Therefore, the first step is to check whether the power supply wiring is correct. The correct power supply wiring should connect the live wire from the power source to the L terminal in the single-phase motor’s junction box, the neutral wire to the N terminal, and the ground wire to the PE terminal.

2. Adjust the motor’s running direction

If there’s no issue with the power wiring, you’ll need to adjust the running direction of the single-phase motor. The running direction of a single-phase motor can be changed by adjusting the wiring configuration of the capacitor. Specifically, simply swap the positions of the two terminals of the capacitor, and this will reverse the running direction of the single-phase motor.

3. Replace the centrifugal switch

If neither of the two methods above resolves the issue of a single-phase motor reversing direction, then it will be necessary to replace the centrifugal switch. The centrifugal switch is a critical component in the starting circuit of a single-phase motor; if the centrifugal switch malfunctions, it can cause the single-phase motor to reverse direction. Therefore, replacing the centrifugal switch is the ultimate solution to the problem of a single-phase motor reversing direction.

The issue of reverse rotation in the centrifugal switch of single-phase motors is one of the common faults in single-phase motors. However, this problem can be effectively resolved by checking the power wiring, adjusting the motor’s running direction, and replacing the centrifugal switch. In practical applications, it is important to select the appropriate solution based on the specific situation to ensure the normal operation of the single-phase motor.