ace writeup (1)

LABORATORY MANUAL : AUTOMATION AND CONTROL ENGINEERING

1

Shri Vile Parle Kelvani Mandals

Dwarkadas J. Sanghvi College Of Engineering Vile Parle, Mumbai (W.)-4000 56

DEPARTMENT OF PRODUCTION ENGINEERING

Dwarkadas. J. Sanghvi College of Engineering

Department of Production Engineering

B.E. Semester VIII

Subject: Automation and Control Engineering

LABORATORY MANUAL


2

AUTOMATION AND CONTROL ENGINEERING

LIST OF PRACTICALS

MODULE 1. PNEUMATICS

1. Extension and Retraction of double acting cylinder with speed control in both directions.

2. Automatic return of double acting cylinder with option of single cycle and auto cycle along

with speed control and rapid return.

3. Automatic retraction of double acting cylinder after delay; with arrangement for

confirmation of complete retraction.

4. Cycle A+, B+, delay, A-, B- to be executed for double acting cylinder A and single acting

cylinder B.

MODULE 2. ELECTRO-PNEUMATICS

5. A double acting cylinder is to be controlled by a single solenoid valve, using one push

button for extension and another for retraction

6. A double acting cylinder is to be controlled by a double solenoid valve. Use sensors /

reed switches for sensing the extended and retracted position of the cylinder, with option of

single cycle and auto cycle.

7. Cycle A+, B+, A-, B- to be executed for double acting cylinder A and single acting

cylinder B.

MODULE 3. PNEUMATICS USING PROGRAMMABLE LOGIC CONTROLLER

8. A cylinder is to automatically feed 10 work pieces on pressing a push button and then stop.

There should also be an alternate provision to manually stop the cylinder using a stop push

button.

9. A cylinder must move forward on pressing a push button, after a 10 second delay. It must

stay in the forward position for 5 seconds and then retract automatically. It must be capable

of continuous cycles until stopped by another push button.


3

Experiment No. 1

PNEUMATICS CIRCUIT:

CONTROL OF A

DOUBLE ACTING CYLINDER

WITH SPEED CONTROL IN

BOTH DIRECTIONS


4

CIRCUIT DIAGRAM FOR

Experiment No. 1

60

%

40

%

4 2

5

1

3

2

1 3

2

1 3

1 .0

A

1 .1

1 .5

B

1 .4

0 .1

1 .2 1 .3

2

1 3

0 .2


5

A i m: -

A do ub le a c t i n g cyl i nd e r i s t o ex t en d on p r e s s i n g a pu sh bu t t on A

an d r e t r ac t w h en a p us h bu t t on B i s p re s s ed . S p eed i s t o be con t r o l l ed i n bo th d i r ec t io ns .

Equ ip ment Us ed : -

S r . No . D es i gna t ion C o mp on en t D es cr ip t i on

1 1 . 0 D o ub le A c tu a t in g C yl i nd e r

2 1 . 1 5 /2 W ay V a l v e

3 1 . 2 3 /2 W ay V a l v e

4 1 . 3 3 /2 W ay V a l v e

5 1 . 5 O n e Wa y F l o w Co n t r o l v a l ve

6 1 . 4 O n e Wa y F l o w Co n t r o l v a l ve

7 0 . 2 3 /2 W ay V a l v e

8 0 . 1 FR L U n i t

9 C om pr ess o r

W or ki ng o f t he Ci r c u i t : -

T h e pu sh b u t t on A i s p r es sed th e 5 / 2 w a y v a l v e i s a c t iva t ed an d a i r f l o ws t o t h e rea r end o f t h e d ou b l e a c t i n g cyl i n de r t h ro u gh the ch eck v a l v e . T h e a i r comi n g ou t f r om th e f ro n t end o f t h e cyl i n der f l ow s th r ou gh t h e o n e w a y f l o w co n t r o l v a l ve and t hu s t h r o t t l i n g and s p eed co n t ro l t ak es p l ace . H en ce t h e c yl i n de r ex t end s t o i t s ex t r eme p os i t i on .

Wh en t h e p us h b u t to n B i s p r e s s ed t h e 5 /2 w ay v a l v e ge t s i t s p i l o t s i gn a l and i s d eac t iv a t ed . T h e a i r t h en f lo ws to t h e f r on t en d o f t h e do ub l e a c t in g cyl i n d e r t h r o u gh t h e ch eck v a l ve . Th e a i r comi n g ou t f r om th e r ea r en d o f t h e c yl i n de r f l o ws t h ro u gh t h e o n e w ay f l o w co n t ro l v a l v e and t hu s th r o t t l i n g and s p eed con t ro l t ake s p l ace o f t he r e t r a c t s t ro k e . H ence th e c yl i nd e r r e t ra c t s t o i t s ex t r em e p os i t i on .

R esu l t : -

T h e c i rcu i t a f t e r b e i n g con n ec t ed as sh o wn i n t h e c i rcu i t d i ag r am

s ho u l d wo rk a s ex p ec t ed . Th e c yl i nd e r s ho u l d ex t en d on p r e s s in g

b u t to n A and r e t r ac t on p r es s in g bu t t on B . S p eed C on t r o l du r i n g f o r w a rd an d r ev e rse s t r ok e sh ou ld be p os s i b l e b y ad j us t i n g th e s c r ews

o n th e f lo w con t ro l v a l v es o n ro d and cap en d , r e sp ec t iv e l y.


6

Experiment No. 2

PNEUMATICS CIRCUIT:

CONTROL OF A DOUBLE ACTING

CYLINDER : WITH AUTOMATIC

RAPID RETURN


7

CIRCUIT DIAGRAM FOR

Experiment No. 2

50

%

4 2

5

1

3

1

2

3

LS2LS1

2

1 3

2

1 3

2

1 3

LS1

1 1

2

2

1 3

LS2

1 .0

1 .0

1 .8

1 .31 .61 .4

1 .2

1 .1

1. 101 .5


8

A i m: -

A u t om a t i c r e t u rn o f d ou b l e a c t i n g cyl i n d e r wi th t h e op t io n o f

s in g l e and au t o c yc l e a lo n g wi t h sp eed con t r o l a n d r ap id re t u r n .


S r .N o D es i gna t ion C o mp on en t D es cr ip t i on


2 1 . 1 5 /3 W ay V a l v e

3 1 . 2 S hu t t l e V a l v e

4 1 . 3 3 /2 W ay V a l v e

5 1 . 4 3 /2 W ay V a l v e

6 1 . 10 O n e Wa y F l o w Co n t r o l V a l v e

7 1 . 5 Q u ick Ex h au s t V a lv e

8 1 . 6 3 /2 W ay V a l v e

9 1 . 8 3 /2 W ay V a l v e

1 0 0 . 1 FR L U n i t

1 1 C om pr ess o r

W o rkin g o f th e C ircu i t : -

3 /2 W ay V a l v e num b er ed 1 . 8 i s a l r e ad y ac t i v a t ed a t t h e s t a r t o f t he c yc l e . W h en t h e pu sh b u t t on "1 . 4 " i s p r es s ed , a i r f l ow s and

g i v e s an ac t iv a t in g p i lo t in g s i gn a l t o 5 /3 w ay v a l v e 1 .1 . T h e a i r t h en f l ow s th r ou gh t h e Q u i ck Ex h aus t Va l v e b yp as s and p r e s su r i z es t he

r e a r end o f t h e Dou b l e A c t i n g C yl i nde r w h i ch th en ex t en ds to ex t r em e

p os i t i on " LS 2 " . Th r o t t l i n g i s do n e th r ou gh a o n e w ay f l o w co n t ro l

v a lv e . "LS2 when ac t iva ted t r ips 3 /2 wa y v a l v e 1 .3 wh i ch g iv es d eac t iv a t in g p i l o t s i gn a l t o 1 .1 . A i r no w en t e r s t h e f ro n t en d o f t h e c yl i n d e r t h r ou gh th e check v a l v e and th e a i r f r om t he r ea r en d i s

r e l e as ed qu i ck l y t h r o u gh a Q u i ck Ex hau s t v a l v e . H en ce R ap id R e t u rn t ak es p l ace . I f t h e 3 /2 w a y v a l v e 1 . 6 i s s wi t ch ed o n th en mu l t i c yc l i n g wi l l o ccu r an d th e p ro ce ss w i l l r ep ea t i t s e l f .

R esu l t : -

T h e c i r cu i t i s t o b e co n n ec t ed a s s ho wn i n t h e c i r cu i t d i ag r am and

t e s t ed w i th p h ys i ca l com po n en t s . S in g l e C yc l e / M u l t i C yc l e

a r r an gement i s t o b e p ro v id ed i n t h e c i r cu i t . Rap i d re tu r n o f C yl i nd er

w i l l b e mad e pos s ib l e d u e t o t h e u se o f t h e Q u i ck Ex h aus t Va lv e . F l ow

o u t o f t h e c yl i n de r i s me t e r ed , t hu s f l o w co n t ro l d u r in g f o r w a rd s t r ok e

i s m ad e p os s ib l e . T h e c i r cu i t i s t h us fu n c t i on a l and ach i ev e s t he

o b j ec t iv es .


9

Experiment No. 3

PNEUMATICS CIRCUIT:


CYLINDER : AUTOMATIC

RETRACTION AFTER DELAY


10

CIRCUIT DIAGRAM FOR

Experiment No. 3

50%

2

1

12

3

4 2

5

1

3

2

1 3

2

1 3

LS12

1 3

LS2

LS1 LS2

2

1 3

1 .0

1 .3

0 .1

0 .2

1 .4

1 .21 .5

1 .1


11

A i m: -

A d o ub l e a c t i n g c yl in de r s ho u ld ex t end o n p r es s in g a p u sh b u t ton

A an d r e t r a c t au to m at i ca l l y a f t e r a d e l ay. A n a r r an gem ent t o co n f i rm co mpl e t e r e t r a c t i on sh ou ld b e in c lu ded in t he c i r cu i t .


A t t h e s t a r t o f t h e c yc l e t h e c yl i nd e r i s i n r e t r a c t ed pos i t i o n and

h en ce 3 /2 Wa y V a l v e A i s a c t i v a t ed . W h en th e pu sh b u t to n A i s p r e s s ed , a c t i v a t i n g p i l o t s i gn a l i s g iven to t h e Do ub l e Ac t i n g C yl i n d e r 1 .0 . Th e cyl i n d er ex t end s t o i t s o u t e r m os t p os i t i on .

Wh en th e c yl i n d e r ex t en ds , LS 2 i s p r e s s ed , a i r f l o ws th r ou gh a t im e d e l a y c i r cu i t . Wh en t h e d e l a y i s co mp le t ed t h e d eac t i v a t i n g p i lo t s i gn a l i s s en t t o t he 5 /2 W ay v a l v e 1 . 1 , an d t he c yl i nd e r r e t u r ns t o t h e r e t r a c t ed p os i t i o n LS 1 . Th us the c i r cu i t s com pl e t e d .

S r . No . D es i gn a t io n C om po nen t D es cr ip t io n

1 1 . 0 D o ub le A c t i n g C yl i n d e r

2 1 . 1 5 /2 W ay V a l v e

3 1 . 2 3 /2 W ay V a l v e

4 1 . 3 3 /2 W ay V a l v e

5 1 . 4 3 /2 W ay V a l v e

6 1 . 5 T im e D el a y v a l ve

7 0 . 2 3 /2 W ay V a l v e

8 0 . 1 FR L U n i t

9 C om pr ess o r

R esu l t : -

T h e c i r cu i t w as con n ec t ed a s s ho wn i n t he c i rcu i t d i ag r am and

t e s t ed wi t h ph ys i ca l com po n en t s . Bo th ex tens io n and r e t r ac t io n a r e

p us h bu t to n con t ro l l ed . D u e t o t h e r o l l e r l im i t s wi t ch a t LS 1 co mpl e t e r e t r a c t i on i s con f i r m ed an d c yc l e w i l l no t s t a r t aga i n u n les s

t h e cyl i n de r i s i n r e t r a c t ed con d i t i o n . T im e D el ay v a l v e i s u sed whi ch

co n t ro l s t h e d e l a y b e tw een th e ro l l e r l imi t sw i t ch LS 2 an d r e t r ac t o f c yl i n d e r . T h e c i r cu i t w as th us fu n c t i on a l and ex p e r i m en t i s com pl e t ed .


12

Experiment No. 4

PNEUMATICS CIRCUIT:


CYLINDER A AND SINGLE ACTING CYLINER B TO EFFECT THE SEQUENCE:

A+ B

+ DELAY A

- B

-


13

4 2

5

1

3

2

1 3

A0 A1 B1B0

2

1 3

2

1 3

B0

50%

2

1

12

3

2

1 3

B1

2

1 3

A1

2

1 3

A0

2

1 3

1 .0

0 .1

0 .2

2 .3

2 .1

2 .2

1 .3

1 .5

1 .4

1 .2

1 .1

2.0

CIRCUIT DIAGRAM FOR

Experiment No. 4


14

A i m: -

Do ub le a c t i ng c yl i n d e r A and a s in g l e a c t in g c yl i nd e r B sh ou ld

ex ecu t e t h e c yc l e A+ , B+ , D e l a y, A - , B -

W o rkin g o f th e C ircu i t

A t th e s t a r t o f t h e c yc l e t h e c yl in d e rs A a nd B a r e i n r e t r a c t ed po s i t i o n an d hen ce v a l v e 2 .3 i s a c t i v a t ed . Wh en p ush b u t to n 1 .2 i s p r es s ed a c t iv a t in g p i lo t s i gna l i s s en t t o 5 /2 w a y v a l v e 1 .1 and h en ce C yl in de r "A " s t a r t s t o ex t en d . At f u l l ex t en s i on i t t r i p s 3 /2 w ay v a l v e 2 .2 du e t o sw i t ch A 2 . 2 . 2 g i v es ac t i v a t i n g p i lo t s i gn a l t o 2 .1 w h i ch i n t u r n c au s es S in g l e a c t i n g c yl i nd e r "2 . 0 " t o ex t en d .

3 /2 w a y v a l ve 1 .3 i s t r i p ped d u e t o ro l l e r l im i t s w i t ch B1 . A i r n ow f l o ws t h r o u gh a t im e d e l a y c i r cu i t . Wh en t h e d e l a y i s

co mpl e t ed d eac t i va t i n g p i l o t s i gn a l i s g iv e t o 1 . 1 C yl i n d e r A r e t r a c t s an d to u ches ro l l e r l imi t s wi t ch A 1 . T h i s i n t u rn c aus e s r e t r a c t o f B .

H en ce th e c yc l e i s comp l e t ed i n t he g i v en s eq uen ce A + , B+ ,

D e l ay, A - , an d B -



1 1 . 0 D o ub le A c t i n g C yl i n d e r A

2 1 . 1 5 /2 W ay V a l v e

3 1 . 2 3 /2 W ay V a l v e

4 1 . 3 3 /2 W ay V a l v e

5 1 . 5 T im e D el a y v a l ve

6 2 . 0 S i n g l e A c t i n g C yl in d e r B

7 2 . 1 3 /2 W ay V a l v e

8 2 . 2 3 /2 W ay V a l v e

9 2 . 3 3 /2 W ay V a l v e

1 0 0 . 2 3 /2 W ay V a l v e

1 1 0 . 1 FR L U n i t

1 2 C om pr ess o r

R esu l t : -

T h e c i r cu i t w as con n ec t ed a s sh ow n in t h e c i r cu i t and t es t ed wi th

p h ys i ca l co mp on en t s . Do ub le A c t i n g an d S i n g le A c t i n g Cyl i n d e rs hav e

b een us ed t o p e r f o r m th e g i v en s eq uen ce o f op e r a t i on s . A s r equ i r ed

ex t ens io n o f B s t a r t s o n l y a f t e r co n f i rm a t io n o f ex t ens i on o f A b y

r o l l e r l i mi t s wi t ch . S imi l a r l y B r e t r ac t s a f t e r t he co nf i rm at io n o f f u l l

r e t r a c t i on o f A . Th e c i r cu i t w as th us f u nc t io n a l and ex p e r im en t i s

co mpl e t e .


15

Experiment No. 5

ELECTRO-PNEUMATIC CIRCUIT:

CONTROL OF DOUBLE ACTING

CYLINDER USING SINGLE

SOLENOID SPRING RETURN

VALVE


16

4 2

5

1

3

Y1

+24V

PB1

K1

K1

Y1

0V

1 .0

1 .1

1 2

2


17

A i m: -

A D ou b l e A c t in g cyl i n d e r i s t o b e con t ro l l ed b y a 5 /2 wa y s i n g le

s o l eno i d , s p r in g r e tu r n v a l ve .


O n keep i n g t h e Pu sh bu t to n p r es s ed . R e l a y K ge t s en e r g i zed

w h ich caus es m ake S w i t ch K 1 to c l ose an d ac t i v a t es So len o i d Y I . D u e

t o t h i s a c t i v a t i n g p i l o t i n g s i gn a l i s g i v en t o so l eno id an d po r t 1 i s

co nn ec t ed to po r t 4 . Th i s r esu l t s i n t h e ex t ens i on o f 1 . 0 . Fo r f u l l

ex t ens io n th e pu sh b u t to n ha s t o b e k ep t p re s s ed .

Wh en t h e pu sh b u t to n i s r e l e as ed t he e l e c t r i c s i gna l i s cu t - o f f

an d du e to s p r in g r e t u rn ac t i on , t h e 5 / 2 w a y S i n g l e So l en o id V a lv e

s h i f t s t o co nn ec t po r t 1 t o p o r t 2 . Ai r n o w f l ow s i n t o t he an nu lu s o f t h e

c yl i n d e r , t h us c au s i n g i t t o r e t r a c t t o i t s o r i g in a l p os i t i on .


S r .N o . D es i gna t ion C o mp on en t D es cr ip t i on

1 1 . 0 D o ub le A c t i n g cyl i n d e r

2 1 . 1 5 /2 W ay S i n gl e So len o i d V a l ve

3 K 1 R e l a y

4 Y 1 S o l en o i d

5 P B1 P us h Bu t t on

6 2 4 V E l ec t r i c con nec t i on

7 C om pr ess o r

R esu l t : -

T h e c i r cu i t w as as sem bl ed a s sh ov . l l 1 i n t h e c i r cu i t wi t h p h ys i ca l

co mp on en t s . Th e c yl i n d e r ex t end ed w h i l e t h e p us h b u t to n was kep t

p r e s s ed and r e t r ac t ed as s oo n as i t w as r e l e as ed . H en ce a Do ub le

A c t i n g C yl i n d er was con t r o l l ed b y a 5 /2 W a y S i n g l e So l eno i d , Sp r i n g

R e t u rn V al v e . T hu s t h e c i r cu i t was f un c t io n a l and ach i ev ed i t s

o b j ec t iv es .


18

Experiment No. 6


CONTROL OF DOUBLE ACTING

CYLINDER USING DOUBLE

SOLENOID VALUE, TO EFFECT

AUTOMATIC EXTENTION AND

RETRACTION USING PROXIMITY

SENSORS


19

A0 A1

4 2

5

1

3

Y1 Y2

+24V

PB1

A0

K1

K1

Y1

A1

K2

K2

Y2

0V

1 3 4 6

3 6

1.0

1.1


20

A i m: -

A do ub l e a c t i n g cyl in de r i s t o b e con t r o l l ed b y a 5 / 2 w ay d o u b l e s o l eno i d v a lv e . An i n du c t i v e p r ox imi t y s en s o r i s t o b e u s ed to s en s e

t h e r e t r a c t ed po s i t i o n an d a c ap ac i t i ve s en so r t o b e u s ed to s ens e the

ex t en ded po s i t i o n o f t h e ac tu a t o r .


C yl i nd e r 1 .0 i s i n i t i a l l y i n i t s i n i t i a l l y p o s i t i o n a s s how n i n t h e

c i r cu i t d i ag r am . At p os i t i o n A1 In d u c t iv e P rox imi t y S wi t ch i s ON. H en ce on p r es s in g t h e p us h bu t to n . Re l a y, K l ge t s a c t iv a t ed w hi ch in

t u rn en e r g i z es So len o i d Y I . T h i s cau s es C yl i nd e r 1 .0 t o ex t end to

p os i t i on A2 .

A t A 2 C ap ac i t i v e P r ox im i t y S w i t ch i s t u rn ed O N an d h ence R e l a y K 2 ge t s a c t i v a t ed w h ich in t u r n en er g i z e s S o l en o i d Y2 . Th i s c aus es

C yl i nd e r 1 . 0 t o r e t r a c t t o po s i t i o n A 1 T h e c yc l e c an be r ep ea t ed b y

p r e s s i n g t h e pus h bu t t on aga i n .




2 1 . 1 5 /2 W ay D o u b l e So l eno i d V a l v e

3 K 1 R e l a y

4 K 2 R e l a y



7 In d u c t iv e P rox imi ty S w i t ch

8 C apac i t i v e P r ox imi t y S wi t ch

9 P us h Bu t t on

1 0 2 4 V E l ec t r i c con nec t i on

1 1 C om pr ess o r

R esu l t : -

T h e c i r cu i t w as a s sem bl ed as s ho wn i n t h e c i r cu i t wi t h phys i ca l

co mp on en t s . Th e cyl i n d e r wi l l ex t en d o n l y w h en r e t r ac t ed pos i t i on i s

co n f i rm ed b y an In d u c t i v e P r ox imi t y S wi t ch and t he p ush bu t to n i s p r e s s ed . O n fu l l ex t ens i on C ap ac i t i v e P rox i mi t y S wi t ch ge t s a c t i v a t ed

w h ich au t om at i ca l ly c au s e s c yl i nd e r 1 . 0 t o re t ra c t H en ce a D ou b l e

A c t i n g C yl i n d e r w as co n t ro l l ed b y a 5 /2 W ay D o u b l e So l en o i d V a l v e

an d ex t r em e po s i t i o ns w er e s ens ed b y C ap ac i t i v e an d i ndu c t iv e p r ox imi t y S w i t ch es . Th us th e c i r cu i t w as f un c t io n a l and ach iev ed i t s

o b j ec t iv


21

Experiment No. 7



CYLINDER A AND SINGLE ACTING CYLINER B TO EFFECT THE SEQUENCE:

A+ B+ DELAY A- B- ;

USING REED SWITCHES AND

SENSORS


22

4 2

5

1

3

Y1 Y2

2

1 3

Y3

B0 B1 S0 S1

+24V

0V

PB1

S0

Y1

B1

K2

K1

K1

S1

Y2

B0

K2

K1

Y3

1 .0

2 .1

2 .0

1 .1

1 3 4 5 7 8

4

8

3


23

A i m: -

D o ub le ac t in g c yl i n d e r A & a s in g le a c t i n g c yl i nd e r B s h ou ld

ex ecu t e t he c yc l e A + , B+ , A - , B - . Ex t ens i on o f B i s t o s t a r t on l y a f t e r a

s e t o f p r es su r e i s r e ach ed in A , as s ens ed b y a p r e s su r e s wi t ch .

Ex t end ed & r e t r ac t ed p os i t i o ns o f A a r e t o b e s ens ed b y r eed s wi t ch es & t h a t o f B a r e t o be s en sed b y p r ox i mi t y s en s o rs .


In i t i a l l y C yl i n d e rs A and B a r c i n r e t ra c t ed s t a t e an d h ence R eed

S wi t ch B l an d In d u c t iv e P r ox imi t y S w i t ch S 1 a r c a c t i va t ed r e s pec t iv e l y

o n p r e s s i n g th e pus h b u t to n So leno id Y 1 i s ene r g i z ed . A i r f l o w s f r om

p o r t 1 t o p o r t 4 o f t h e 5 / 2 W ay d o ub l e S o l en o i d V a l ve . T h i s c au ses

C yl i nd e r A to ex t en d . A P r es su r e s wi t ch "P 1 " i s con n ec t ed to t h e cap

en d o f 1 .0 w h i ch sen s es t h e in c r eas e i n p r es su r e t o t h e r eq u i r ed p r e se t

an d t h en "c lo s es " . A s r eed s wi t ch B2 i s a l s o O N . Re l a y K I ge t s

a c t i v a t ed and en e r g i z es s o l en o id Y 3 , A i r f l ow s f r om po r t 1 t o p o r t 2 o f

3 /2 W ay S i n g l e So l eno i d Va lv e . H ence c yl i n d er 8 ex t en ds to p os i t i on

S 2 .

C apac i t i v e P rox imi t y S w i t ch S2 ac t i v a t es so l en o id Y2 d u e t

w h ich C yl i nd e r A re t r ac t s t o i t s o r i g i na l po s i t i o n as po r t I i s co nn ec t ed

t o p o r t 2 o f 1 . 1 . R eed Sw i t ch 81 i s n ow in c los ed co nd i t i on and

ac t i v a t es r e l a y K 2 w hi ch caus e s N o rm al l y C l o sed (N C) s wi t ch K2 to

o p en ; hen ce deac t iv a t in g r e l a y K 1 w h i ch in - t u rn d c - en er g i z e s so l eno id

Y 3 . Va lv e 2 . 1 s h i f t s d u e t o s p r in g r e t u r n and po r t 2 i s con n ec t ed to

d r a i n . Th i s c aus es C yl i nd e r B r e t r ac t s d ue t o i t s s p r in g re t u r n ac t io n .

Equ ip ment u sed: -



2 2 . 0 S i n g l e A c t i n g C yl in d e r



5 K 1 R e l a y

6 K 2 R e l a y




1 0 B 0 R eed S wi t ch

1 1 B 1 R eed S wi t ch

1 2 S 0 In d u c t iv e P rox imi ty S w i t ch

1 3 S 1 C apac i t i v e P r ox imi t y S wi t ch

1 5 P B 1 P us h Bu t t on

1 6 2 4 V E l ec t r i c a l conn ec t io n

1 7 C om pr ess o r


24

R esu l t : -

T h e c i r cu i t w as a s s embl ed as s ho wn I t h e c i r cu i t d i ag ram us i n g

p h ys i ca l com po n en t s . C yl i n d e r A ex t en ds & a f t e r s u f f i c i en t p r e s s u r e i s

b u i l t up , on l y t h en d o es Ex tens io n o f B t ak e s p l ace . O N co n f o r m at i on

o f fu l l ex t en s i on o f B as s e ns ed b y c ap ac i t i ve p r ox imi ty s w i t ch r e t r a c t

o f cyl i n d e r A t ake s p l ace whi ch i s con f i r med b y R eed S wi t ch B1 .

f i na l l y C yl i n d e r B r eac t s t o S 1 . T he C yc l e c an b e repea t ed aga i n b y

p r e s s i n g t h e Pu sh Bu t t on . T hu s , t h e c i r cu i t i s f un c t io n a l & ach iev es i t s

o b j ec t iv es .


25

Experiment No. 8

ELECTRO-PNEUMATICS CIRCUIT USING PLC:

A cylinder is to automatically feed 10

work pieces on pressing a push button

and then stop. There should also be an

alternate provision to manually stop the

cylinder using a stop push button.


26

C IR C U IT D IA G R AM FOR

Ex pe r im en t No . 8


27

A i m: -

A c yl i n d e r i s t o au t om at i ca l l y f e ed 10 w o rk p i eces on p r e s s in g a p u sh

b u t to n and t h en s to p . Th e r e s ho u ld a l so b e an a l t e r n a t e p ro v i s io n to

m anu a l l y s t op t h e cy l i n d e r us i n g a s t op pus h bu t t on .




2 1 . 1 5 /2 W ay V a l v e

3 0 . 1 FR L U n i t

4 C om pr ess o r


Wh en P us h Bu t to nP B1 i s p r es sed , t h e f l ag i s en e r g i z ed an d th e Co un te r

s t a r t s i t s o p er a t io n . S i n ce th e f l ag and t he co un t e r a r e en e r g i z ed , t he

s ub s eq u en t r un gs wi l l s eq u en t i a l l y ge t en e r g i z ed u n t i l t h e se t cou n t i s

r e ach ed o r t h e f l ag i s r es e t b y t h e S t o p Bu t to n S B .

A s lo n g as t he f l ag i s s e t , i f C yl i n de r A i s i n t h e r e t ra c t ed p os i t i on ,

Li m i t S wi t ch A 0 i s s wi t ch ed on and th us a s s een f ro m t h e l ad d er

d i ag r am , S o l en o i d Y 1 w i l l en e r g i s e and cau s e t h e c yl i nd er t o ex t end .

A s th e cyl i n d er fu l l y ex t en ds , l imi t sw i t ch A1 wi l l be sw i t ch ed o n and

f r om t h e ru n g , w e can s ee th a t So l en o i d Y2 w i l l ge t en e rg i z ed , t h e reb y

cau s in g th e cyl i n d er t o r e t r a c t .

E ach t im e th e So len o i d Y2 i s en e r g i z ed , t h e cou n t e r i n c r em en t s b y a

co un t o f 1 . O n ce th e cou n t e r r e ach es t he s e t v a l u e , wh ich i s 1 0 in t h i s

c a s e , i t d e - en e r g i s es an d t he en t i r e c i rcu i t i s r es e t u n t i l t h e s t a r t b u t t on

i s p re s s ed aga in .

R esu l t : -

T h e c i r cu i t a f t e r b e in g con n ec t ed a s sh ow n i n t h e c i r cu i t d i ag r am

s ho u l d wo rk a s ex p ec ted . T h e cyl i n d e r sh ou ld ex t en d o n p re s s in g the

b u t to n on th e s wi t ch bo a r d an d ex ecu t e 1 0 s t ro kes . A t t h e en d o f t he

1 0t h

s t ro k e i t sh ou ld s to p au to m at i ca l ly .


28

A l l o ca t i on l i s t and Ladd er d i ag ra m f o r E xp er i ment 8 :


29

Experiment No. 9

ELECTRO-PNEUMATICS CIRCUIT USING PLC:

A cylinder must move forward on

pressing a push button, after a 10

second delay. It must stay in the

forward position for 5 seconds and then

retract automatically. It must be capable

of continuous cycles until stopped by

another push button.


30

C IR C U IT D IA G R AM FOR

Ex pe r im en t No . 9


31

A i m: -

A c yl i nd e r mu s t mo v e f o rw a rd on p re s s i n g a pus h b u t to n , a f t e r a 10

s econ d d e l a y. I t mu s t s t ay i n t h e f o rw a r d p os i t i on fo r 5 s eco nd s and

t h en r e t r a c t au to ma t i ca l l y . I t m u s t b e cap ab l e o f co n t in uo us cyc l es

u n t i l s t op ped b y an o th e r p ush b u t to n .




2 1 . 1 5 /2 W ay V a l v e

3 0 . 1 FR L U n i t

4 C om pr ess o r


Wh en Pu sh Bu t t onP B1 i s p r e s s ed , t he f l ag i s en e r g i z ed an d th e T im er

s t a r t s i t s o pe r a t io n . S in ce th e f l ag and th e t im e r TO N0 a r e en er g i z ed ,

t h e su bs equ en t ru ng w i l l ge t en er g i z ed on l y a f t e r t he s e t t im e h as

e l aps ed . A s th e o pen co n t ac t o f T im er c lo se s , s o l eno i d Y 1 i s en er g i zed

an d t h e cyl i n d er ex t en ds . A f t e r t h e c yl i n d e r h a s f u l l y ex t en d ed , t h e

t im e r T O N1 i s en er g i z ed an d i t s co n tac t i n t h e s ub seq uen t rn g c lo s es ,

a f t e r wh i ch s o l en o id Y2 i s en e r g i z ed cau s i n g th e cyl i n d er t o r e t ra c t .

A s l on g a s t h e f l ag i s s e t , t h i s s equ ence w i l l con t in ue , un l es s t h e s top

b u t to n i s p r es s ed .

R esu l t : -

T h e c i r cu i t a f t e r b e in g co nn ec t ed as s ho wn in t he l ad d e r d i ag r am

s ho u l d w o rk a s ex pec t ed . Th e cyl i n d er s ho u l d ex t end 10 s econ ds a f t e r

p r e s s i n g th e bu t ton o n th e sw i t ch bo a r d an d s t a y i n t h e ex t end ed

p os i t i on f o r 5 s econ ds . Th i s s equ en ce s h ou l d con t in u e t i l l s t o p b u t t on

i s p re s s ed .


32

A l l o ca t i on l i s t and Ladd er d i ag ra m f o r E xp er i m ent 9 :

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