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 selecting valve *park the cylinders in the retracted position.
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