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OPEN LOOP AND CLOSEDLOOP FEEDBACK SYSTEM

Kostan D. F Mataubenu

Nim: 2021201



O!e"!ie#

o$n%ust"ia& Cont"o& S'stem #i&& beo(e"ate% as o(en &oo( o" )&ose% &oo(

oMan' Cont"o&&e" use% in $n%ust"ies to

*ee( a s'stem in )onstant )on%ition o"%esi"e% )on%ition. E+. Tem(e"atu",!e&o)it', &i-ui% &e!e&, et).



OPENLOOP AND CLOSED LOOP SYSTEM

oO(en Loo( S'stem

O(e"ate% in manua& mo%e an% notusin/ ee%ba)* si/na&.

E+am(&e o O(en Loo( S'stem



o C&ose% Loo( S'stem

O(e"ate% in auto mo%e, usin/

ee%ba)* si/na& "om senso".

Basi) Pa"t o C&ose% Loo( S'stem

SPError



n%e"stan%in/ te"ms in C&ose% Loo(S'stem

o

Setpoint SP3 is %esi"e% !a&ue to be"ea)4e% in s'stem

oProcess Variable P53 is ee%ba)* si/na&"om senso", a&so )a&&e% senso" si/na&

oError is t4e %i6e"en)e bet#een SP an%P5, )an be a (ositi!e o" a ne/ati!e !a&ue

oSumming Junction is t4e (&a)e #4e"e

t4e SP is )om(a"e% to t4e P5.oController is use% to a%7ust out(utsi/na& in "es(ons to t4e amount o e""o".



8ate" in

$9P

8ate" usausa/e

Pi!otbea"in/

Fee%ba)*Potentiomete"

Set(oint(otentiomete"

-

+

;ain(otentiomete"

$9P )u""ent9(essu"e

)ont"o&&e"

20 (siAi" su((&'

1<1= (siAi" si/na&

F&o# !a&!e

>oat



Cont"o&&e" ?es(onse

oOnO6 Cont"o&

oP"o(o"tiona& Cont"o& P3

o$nte/"a& Cont"o& $3

o

De"i!ati!e Cont"o& D3



o On OFF Cont"o&

Can tu"n t4e out(ut on o" o6 @na&

)ont"o& e&ement3

Setpoint: u((e"&o#e" &e!e&3 an%

&o# )am u((e"&e!e&3PV: #ate" &e!e&

Sensor: >oatController: s#it)4



Di6e"entia& ;a(

$s t4e %istan)e bet#een u((e" an% &o#

)am

Di6e"entia&

/a(



;ain9("o(o"tiona&, "eset9inte/"a& an%"ate9%e"i!ati!e a"e un)tion t4at

%ete"mine 4o# ast t4e )ont"o&&e")4an/e t4e out(ut si/na&

Ea"&' usin/ (eneumati) )ont"o&, !a)umtube an% o( am(

No# a%!a)e% usin/ mi)"o("o)esso"



Gain

Out(ut /ain + e""o"

K) + E

P5 #i&& ne!e" "ea)4

t4e SP T4e &a"/e" t4e /aint4e )&ose" t4e P5 #i&&

/et to t4e SP As /ain in)"ease%,P5 #i&& os)i&&ate mo"e

To so&!e t4ese ("ob&ems,:A%%in/ bias to t4e a&/o"itmOut(ut K) + E3 M+



T'(e o s'stem "es(onse

Time

P5

"es(onse un%e"%um(e% ?es(onse C"iti)a&&'

%um(e%

?es(onse O!e"%um(e%

time

P5

time

P5



Mo%e Manua& Tunnin/ T4e)ont"o&&e"

ie/&a"Ni)4o&as Met4o%3

Out(ut in)"ease% 20 t4en 10. ;et P5

K( P59out(ut

Ne+t obtain Dead Time (DT): t4e timet4at P5 be/in to )4an/e in 10 out(ut.

Time Constant: Time )onstant o" t4e)4an/e o < o 10 out(ut



Gain (P) Reset (I) Rate (D)

P only TC/(Kp*DT)

PI 0.9TC/(Kp*DT) 3DT

PID 1.2TC/(Kp*DT) 2DT 0.5DT



Tunning the Controller inautomate mode

Kuu&timate /ain is /ain !a&ue t4at)ause t4e P5 in sustaine% os)i&&ationat 2= tota& P53

Pu u&timate (e"io% is (e"io% o oneos)i&&ation in sustaine% os)i&&ation

Type oControl

er

Gain !eset !ate

P 0.= KuP" 0.= Ku Pu91.2

P"D 0.Ku 0.=Pu Pu9H



P"o)ess A&a"ms An% De!iation A&a"ms

Tim

e

P5I$;I ALA?M

LO8 ALA?M

Tim

e

1010 %e!iation

10 De!iation

<J0

<J0

P"o)essA&a"m

De!iation A&a"m



Cas)a%e% Cont"o& S'stem



Te"ima*asi4

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