Analysis of the working principle of a sequential control circuit

Sequential control circuit

When two or more motors are installed on a mechanical device at the same time, in order to ensure normal operation, the motors are generally required to be started in sequence. Only after motor 1 is started can motor 2 be started.

Principle of sequential control circuit :

1. After turning on the power, press the button SB1->contactor KM1 is energized->motor M1 is powered and runs.

2. Release button SB1->contactor KM1 self-locks->motor M1 continues to run->at the same time, the upper end of button SB2 is energized.

3. Press button SB2->contactor KM2 energizes->motor M2 is energized and runs.

4. Release button SB2->contactor KM2 self-locks->motor M2 continues to run->motor M1 and M2 run at the same time.