DC motor starting circuit controlled by time relay

This is actually a DC motor starting circuit for resistor step-down starting. It just uses a time relay to control the sequence of short-circuited resistors. Close the power switch QS and press the start button ST. The DC contactor 1KM is powered and closed, and its normally open contact is closed, causing the armature circuit series R1 and R2 to start. The time relay 1KT is also powered on at the same time, and its normally open contact 1KT is closed after a delay, causing 3KM to be powered on, thereby short-circuiting R1 and accelerating the motor M. At this time, another time relay 2KT is electrically activated, and its normally open contact is closed with delay, causing 2KM to be electrically activated and short-circuiting the resistor R2. In this way, the motor enters normal operation.