Autotransformer voltage reduction control circuit

Turn on the power switch os and press the start button SB2. Contactor KM1 is powered and self-locking, its main contact is closed, the autotransformer
TM is connected between the power supply and the motor , and the motor is decompressed and started. The auxiliary moving contact of KM1 is disconnected to ensure that KM2 cannot receive electricity;
the auxiliary moving contact of KM1 is closed, so that the intermediate relay KA1 is energized and self-locking. The moving and closing contact of KA1 is closed, causing the energization delay time relay
KT to be energized.
    When the motor speed is close to its rated speed, the delayed closing moving and closing contact of KT is closed, causing the intermediate relay KA2 to be electrically heated and self-
locking. The moving contact of KA2 is closed to prepare for KM2 to be energized. The movable breaking contact of KA2 is disconnected, and the main contact of KM1 is released
, cutting off the power supply of the motor. The movable breaking contact of KM1 is reset and closed, causing KM2 to self-lock, and the motor After disconnecting from
the autotransformer, the KM2 Jun main contact operates normally under full voltage.