The switch s1 is used to instantly reverse the motor direction whenever.
Dc motor limit switch circuit.
When the control switch is held in the right position the motor runs until the right limit switch opens.
Since diode cr1 will not conduct with a negative potential across it the motor will stop.
The circuit uses 2 relays 2 limit switches and a dc motor.
The interlocks are specially important because if both relays are on it would be a short circuit.
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I have attached a schematic using push buttons instead of limit switches.
As illustrated the relays have to be dc same coil voltage as the motor but the bottom can be separated and fed from a different voltage.
The motor should then rotate until it hits the other limit switch and then wait for the button to be pressed again to rotate in the opposite direction.
Used to vary the pwm of the pulses at the output and which eventually is used for the speed regulation of the connected motor.
Imagine you have two circuits each carrying the same current one is an ac circuit and the other is a dc circuit.