CONTROL ACTIONS. A two position controller has two fixed positions usually on or off.

Transcription

1 VU e-learnng Coreware Conrol ngneerng (M55) CONROL ACIONS An aomac conroller comare he acal vale of he yem o wh he n (ere vale), eermne he evaon, an roce a conrol gnal ha wll rece he evaon o zero or a mall vale. he manner n whch he aomac conroller roce he conrol gnal calle he conrol acon. he conroller may be clafe accorng o her conrol acon a 1) wo oon or on-off conroller 2) Prooronal conroller 3) Inegral conroller 4) Prooronal-l- negral conroller 5) Prooronal-l-ervave conroller 6) Prooronal-l-negral-l-ervave conroller A wo oon conroller ha wo fxe oon ally on or off. A rooronal conrol yem a feeback conrol yem n whch he o forcng fncon recly rooronal o. A negral conrol yem a feeback conrol yem n whch he o forcng fncon recly rooronal o he fr me negral of. A rooronal-l-negral conrol yem a feeback conrol yem n whch he o forcng fncon a lnear combnaon of he an fr me negral. A rooronal-l-ervave conrol yem a feeback conrol yem n whch he o forcng fncon a lnear combnaon of he an fr me ervave. A rooronal-l-ervave-l-negral conrol yem a feeback conrol yem n whch he o forcng fncon a lnear combnaon of he, fr me ervave an fr me negral. Many nral conroller are elecrc, hyralc, nemac, elecronc or her combnaon. he choce of he conroller bae on he nare of lan an oerang conon. may alo be clafe accorng o he ower emloye n he oeraon a 1) lecrc conroller 2) Hyralc conroller 3) Pnemac conroller 4) lecronc conroller. he block agram of a ycal conroller hown n Fg.1. I con of an aomac conroller, an acaor, a lan an a enor. he conroller eec he acang gnal an amlfe. he o of a conroller fe o he acaor ha roce he n o he lan accorng o he conrol gnal. he enor a evce ha conver Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

2 VU e-learnng Coreware Conrol ngneerng (M55) he o varable no anoher able varable o comare he o o n gnal. Senor a feeback elemen of he cloe loo conrol yem. aomac conroller n r() acang gnal e() o () Amlfer Acaor Plan O c() gnal b() Senor wo Poon Conrol Acon Fgre 1 Block agram of conrol yem In a wo oon conrol acon yem, he acang elemen ha only wo oon whch are generally on an off. Generally hee are elecrc evce. hee are wely e are hey are mle an nexenve. he o of he conroller gven by qn.1. U U 1 2 e e..(1) Where, U 1 an U 2 are conan ( U 2 = -U 1 or zero) he block agram of on-off conroller hown n Fg. 2 n r() acang gnal e() o () gnal b() Prooronal Conrol Acon Fgre 2 Block agram of on off conroller he rooronal conroller eenally an amlfer wh an ajable gan. For a conroller wh rooronal conrol acon he relaonh beween o of he conroller () an he acang gnal e() Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

3 VU e-learnng Coreware Conrol ngneerng (M55) Where, he rooronal gan. e...(2) Or n Lalace ranforme qane U..(3) Whaever he acal mechanm may be he rooronal conroller eenally an amlfer wh an ajable gan. he block agram of rooronal conroller hown n Fg.3. n r() acang gnal e() o () gnal b() Fgre 3 Block agram of a rooronal conroller Inegral Conrol Acon he vale of he conroller o () change a a rae rooronal o he acang gnal e() gven by qn.4 e Where, an ajable conan. he ranfer fncon of negral conroller or e..(4) U.(5) If he vale of e() oble, hen () vare wce a fa. For zero acang, he vale of () reman aonary. he negral conrol acon alo calle ree conrol. Fg.4 how he block agram of he negral conroller. Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

4 VU e-learnng Coreware Conrol ngneerng (M55) n r() acang gnal e() o () gnal b() Fgre 4 Block agram of an negral conroller Prooronal-l-Inegral Conrol Acon he conrol acon of a rooronal-l-negral conroller efne by e e he ranfer fncon of he conroller U 1 1..(6)...(7) Where, he rooronal gan, he negral me whch are ajable. he negral me aj he negral conrol acon, whle change n rooronal gan affec boh he rooronal an negral acon. he nvere of he negral me calle ree rae. he ree rae he nmber of me er mne ha a rooronal ar of he conrol acon lcae. Fg.5 how he block agram of he rooronall-negral conroller. For an acang of n e n, he conroller o hown n Fg.6. n r() acang gnal e() o () 1 gnal b() Fgre 5 Block agram of a rooronal-l-negral conrol yem Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

5 VU e-learnng Coreware Conrol ngneerng (M55) () P-I conrol acon 2 rooronal only Fgre 6 Reone of PI conroller o n acang gnal Prooronal-l-Dervave Conrol Acon he conrol acon of rooronal-l-ervave conroller efne by he ranfer fncon U e 1 e..(8)..(9) Where, he rooronal gan an a ervave me conan. Boh, an are ajable. he ervave conrol acon alo calle rae conrol. In rae conroller he o rooronal o he rae of change of acang gnal. he ervave me he me nerval by whch he rae acon avance he effec of he rooronal conrol acon. he ervave conroller ancaory n nare an amlfe he noe effec. Fg.7 how he block agram of he rooronall-ervave. For an acang of n ram n, he conroller o hown n Fg.8 n r() acang gnal e() P 1 o () D S gnal b() Fgre 7 Block agram of a rooronal-l-ervave conroller Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

6 VU e-learnng Coreware Conrol ngneerng (M55) () P-D conrol acon rooronal only Fgre 8 Reone of PD conroller o n acang gnal Prooronal-l-Inegral-l-Dervave Conrol Acon I a combnaon of rooronal conrol acon, negral conrol acon an ervave conrol acon. he eqaon of he conroller or he ranfer fncon e e U 1 1 o e..(1)..(11) Where, he rooronal gan, he negral me, an he ervave me. he block agram of PID conroller hown n Fg.9. For an acang of n ram n, he conroller o hown n Fg.1. n r() acang gnal e() 1 2 o () gnal b() Fgre 9 Block agram of a rooronal-l-negral-l-ervave conroller Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.

7 VU e-learnng Coreware Conrol ngneerng (M55) () PID conrol acon PD conrol acon rooronal only Fgre 1 Reone of PID conroller o n acang gnal Prof. S. C.Pll, Prncal, Seon: XIV, 26/9/6.L..S. College of ngneerng an echnology, Belgam-598.