Question

Q7. Describe how the diagram works. (13p) (Condition: LS1 and LS3 are normal open, and LS2 is normal close. LSI is already pushed down) PB1 PB 2 LSI LS3 LS2 CRI CR1 2 DO KAMEN LSI с SOL B CR2 3 CR1 LS 2 LI + LS3 CR2 SOLA O O CR3 5 MIX CR2 SOLA CR3 SOLB

Answer 1

PB1 PB2 CR1 o CR1 LS1 (CR2 3 CR1 LS2 of sola 4 CR2 LS3 (CR3 5 оо, CR2 SOLB CR3 * In the first rung Condition for off in One N/O PB 1 (Push button] and one N/C (PB2 Pushbutton). Whenever PB1 is pressed the circuit is completed and CR 1 actuated. It is holded with N/o point available in the parallel to 2nd rung). Because w/o of CRI N/C after actuating . 2 PB1(2nd becomes

In with the ON Status the 3rd rung, CR 1 (with N/O of CR1) and LS2 N/c, whenever the limit switch (LS1) closed the control Relay CR2 actuated is also actreated with it. with help of No (which becomes N/c often actuating) of CR2 (in 4th 'sung) and SOLA And they are holded ning with and SOLB is also * In the 5th ON staties of CRzec, (with No of CR2), whenever the linit swirch (L53) closed, the control Relay CR3 actuated actuated with it. And they holded with the help of N/o- of CR3 (which becomes N/c after getting actuating) (In the 6th rung) Conditions for are also OFF -

the whole CR 1 gets deactivated and * Whenever the push button PB2 is pressed, it becomes N/o and the process is stopped immediately * After getting CR1 & actuated if LS2 is closed, then further process will be which stopped, as will be off will make CR3 off. And the whole process will stoppede CR2