Circuit for automatically switching two motors to start in sequence and stop in reverse sequence

When the circuit controls the starting of electrical equipment, it starts the motor M1 first, and automatically starts the motor M2 after a delay. When it stops, it does the opposite, that is, it
stops the motor M2 first, and then automatically stops the motor ~n after a delay. The circuit for automatically
switching two motors to start in sequence and stop in reverse sequence is shown in Figure 4-29 .     The working principle is that when starting, press the start button SB2, the coil of the delay time relay KT1 and the delay time relay KT2 are energized and closed at the same time, and KT1 does not delay the instantaneous contact closing. The moving and closing contact of KT2 that is disconnected by the power loss delay is closed, the coil of AC contactor KM1 is powered and closed, its main contact KMl}Ij is closed, and the motor Ml starts.     After a certain delay, the moving and closing contact of KT1 delayed closing is closed, and the coil of AC contactor KM2 is closed. The main contact of KM2 is closed and motor M2 starts. Realize starting the motor Ml first, and then automatically starting the motor MZ.   When stopping, press the stop button SB1. At this time, the KTI and KT2 coils are de-energized and released. When KT1 is powered on, the delayed closing moving and closing contact returns to normal open, and the KM2 coil is released when the power is off.