May$-$Aug $2023$

Q$5$ Figure Q$5$ shows electropneumatic system for sorting two different$-$sized boxes moving on a conveyor. Low boxes are allowed to continue the same conveyor, but high boxes will trigger $1-$LS and are pushed on to a second conveyor by a pneumatic cylinder. $2-$LS is actuated after the high box has been completely positioned onto the second conveyor.

$($a$)$ Illustrate using ladder diagram the electrical control system needed to operate the dual cylinder circuit shown in Figure Q$5($a$)$ with following sequence:

$(14$ marks$)$

$($b$)$ Explain the operating sequence of electrical control system in Q$5($a$).$

$(6$ marks$)$