Feed control circuit with positioning clamping

The copper control circuit of a mechanical power slide with reverse working feed is shown in Figure 2-21. In the figure, Ml is the feed motor , M2 is the fast
motor , and KM1 and KM2 are the time and reversal contactors of the two motors. , KM3 is the line contactor of M2.
    The working principle of the circuit is as follows; press the forward working button SBI, Klffl is energized and self-locking, and Ml starts in the forward direction. At the same time, KM3 is powered on,
M2 also starts in the forward direction, and the slide table moves forward at a fast processing speed. When the retaining iron presses down s02. When KM3 is powered off , the fast motor stops and brakes, and
the slide table continues to move forward at the working speed until the end of processing, when SQ3 is pressed. KM1 is powered off, KM2 is powered on, the working motor reverses, and the slide table moves forward
at the working speed. Retreat to the limit switch SQ2 and release it. KM3 is powered on again, the fast motor starts in reverse, the slide table
returns to the original position at the fast rewind processing speed, press soi, KMi2 and KM3 are powered off, M1 and M2 stop at the same time, M2 is braked, and the slide table stops in the original position , the work cycle
ends. i
    This circuit only uses three contactors to control the forward and reverse rotation of two motors at the same time. When selecting contactors, the capacity of KM1 and KM2 should be considered in conjunction with the capacity of the
two motors .