1.) Design and draw a circuit using the cascade system to operate two cylinders (A and B) which, on the operation of a start valve, produces the sequence A - B + B - A+. The cylinders should park in the positions B - A + when the start switch is in the ‘off' position.
2.) Modify the circuit designed for question 1 to provide an emergency stop which will park both cylinders in the extended position (i.e. A + B +).
3.) Modify the circuit designed for question 1 to provide a fail-safe. The fail safe should:
*act in the event of a reduced pressure at inlet to the group selectingvalve
*park the cylinders in the retracted position.