CHUYN 2:GHP NI B IUKHIN BIN TNNhmPhng Quang TuynNguyn Vn QunhPhm Ngc Thnh Th ThyLi Th SnHong Anh T

Bi ton:Ghp ni PLC S7-200 vi bin tn SIEMENS, t ng n nh p sut trn ng ng ca h thng cp nc.

Khi Qut H Thng Bm NcH thng trang b cho nh my nc c 2 bm cp nc sinh hot, vi cng sut thit k nht nh. trnh tht thot v tit kim in nng, ta s dng h thng iu khin t ng gi p sut c nh trn ng ng bng cm bin p sut v bin tn iu khin cng sut ng c nhm mc ch tit kim nng lng.

Bin tn MicroMaster Eco (SIEMENS) c s dng cho ng c, cng sut tiu th ca ng c s c bin tn iu chnh cho ph hp vi nhu cu ph ti. ng c th 2 s s dng chy nn nu sau ny ph ti pht trin ln hn.Mt sensor p sut c a vo u ra nc cp ca Nh my o p lc nc a v h thng iu khin.H thng iu khin l 1 PLC S7-200 (SIEMENS) m bo cho vic t ng ha hon ton qu trnh bm cp nc ca Nh my.Vn hnh h thng thng qua mn hnh vn hnh TD200

Cc mch ng lc cng nh mch tn hiu ca h thng mi s c u ni vi h thng c m khng lm thay i chc nng cng nh hot ng h thng iu khin c lp t ban u.Hot ng ca hai h thng nh sau: H thng c c s dng nh h thng iu khin bng tay, l h thng iu khin d phng khi h thng mi lp bin tn c s c. Vic chuyn i gia hai ch t ng v bng tay c thc hin bng cc cng tc chuyn i v tr, v bng cch ci t trn mn hnh vn hnh TD200. H thng mi v c s c u ni m bo chnh xc, v vn hnh an ton trong mi tnh hung. m bo tnh an ton cao nht ca c h thng.

Biu sau minh ha hot ng ca h thng mi:Nh vy vi vic a bin tn vo h thng s hot ng bm st theo ng thc t lu lng ph ti, do vy s gim ng k nng lng tiu hao khng cn thit vo cc gi ph ti thp im.

S KHI GHP NI

PLC S7-200: b iu khin trung tm, n x l cc tn hiu thu thp v t h thng iu khin cc ng c. Cc ng c c iu khin chy thng qua bin tn v cc contactor.Converter (bin tn): iu khin trn tc ng c. Vi bin tn th ng c chy vi hiu sut rt cao ngay c khi hot ng tc thp. Bin tn s lm cho h thng hot ng tit kim nng lng in so vi cch hot ng c ca trm.u o p sut: mc ch o p sut mng. Vi tn hiu o c t u o p sut a v PLC x l iu khin tc bm. Vi u o ny PLC s gim st c p sut nc trn mng.Mn hnh hin th TD-200: dng ci t cc ch hot ng ca trm, ci p sut mng... Ngoi ra, trn mn hnh cn hin th p sut o c trn ng ng mng.

NGUYN L HOT NGVi thit k ny, h thng s t ng gim st p sut nc trn ng ng mng v iu khin ngc li m bo gi ng p sut theo yu cu. PLC s iu khin p sut nc trn ng ng mng theo th ph ti ngy, tc l h thng s iu khin p sut theo thi gian thc. H thng iu khin t ng ny mt s chc nng chnh sau:o lng: do u o p sut o lng v chuyn i a v CPU ca S7-200.X l thng tin: b iu khin trung tm s m nhim vn ny.iu khin: S7-200 s phi hp vi bin tn lm vic ny theo yu cu.Gim st: S7-200 s kt u o p sut gim st h thng hot ng.Giao tip gia ngi vn hnh v thit b: do mn hnh hin th TD-200 thc hin.

GII THIU CC THIT BBIN TN MICROMASTER 440 (SIEMENS)Micromaster 440 chnh l mt h bin tn mnh m nht trong dng cc bin tn tiu chun. Kh nng iu khin vector cho tc Moment hay kh nng iu khin vng kn bng b PID c sn em li chnh xc tuyt vi cho cc h thng truyn ng quan trng nh cc h nng chuyn, cc h thng nh v. Khng ch c vy, mt lot khi Logic c sn lp trnh t do cung cp cho ngi dng s linh hot ti a trong vic iu khin hng lot thao tc mt cch t ng

Nt ni bt ca MICROMASTER 440- Thit k nh gn v d gdng lp t.- iu khin Vector vng kn (Tc / Moment).- C nhiu cc la chn truyn thng : PROFIBUS, Device Net, CANopen.- 3 b tham s trong 1 nhm thch ng bin tn vi cc ch hot ng khc nhau.- nh mc theo ti Moment khng i hoc Bm, Qut.- D tr ng nng chng st p.- Tch hp sn b hm dng in tr cho cc bin tn n 75kW.- 4 tn s ngt qung trnh cng hng ln ng c hoc ln my.- Khi ng bm khi bin tn ni vi ng c quay.- Tch hp chc nng bo v nhit cho ng c dng PTC / KTY.- Khi chc nng Logic t do : AND, OR, nh thi, m.- Moment khng i khi qua tc 0.- Kim sot Moment ti.

II. Thit b lp trnh bin tn MM440. BOP-2Thit b lp trnh bin tn Siemens Micromaster BOP-2(Basic Operator Panel) cho b bin tn MM440 c giao din vi bn phm v 5 ch s hin th cho php nhp cc thng s iu khin.BOP-2 c th gn trc tip trn b bin tn hay trong cnh ca t phn phi s dng mt b ni.

III. THIT B LP TRNH PLC S7-200

CHC NNG H PLCThit b iu khin lp trnh c( PLC- Programable Logic Controler) l thit b c iu khin c bit da trn b vi x l, s dng b nh lp trnh c lu gi cc lnh, thc hin cc chc nng v thut ton diu khin my v cc qu trnh.Gii thiu mt s nhm PLC Siemens CPU S7 200: CPU 21x: 210; 212; 214; 215-2DP; 216. CPU 22x: 221; 222; 224; 224XP; 226; 226XM. CPU S7300: CPU S7400:

CC KHI NIM C BN CA S7-200Cc thnh phn ca mt PLC S7-200 thng c cc modul phn cng sau: 1. Modul ngun. 2. Modul n v x l trung tm. 3. Modul b nh chng trnh v d liu. 4. Modul u vo. 5. Modul u ra. 6. Modul phi ghp ( h tr cho vn truyn thng ni b). 7. Modul chc nng ( h tr cho vn truyn thng mng).

M HNH TNG QUT CA MT PLC S7-200

thc hin mt chng trnh iu khin s th yu cu PLC phi c tnh nng nh mt my tnh (PC). CPU (n v x l trung tm) B nh chnh (RAM, EEPROM, EPROM,...), b nh m rng. H iu hnh. Port vo/ra (giao tip trc tip vi thit b iu khin). Port truyn thng (trao i thng tin vi mi trng xung quanh). Cc khi chc nng c bit nh: T, C, cc khi chuyn dng khc.

PLC c u im vt tri so vi cc h thng iu khin c in nh rle, mch t hp in t, IC s. Thit b cho php thc hin linh hat cc thut ton iu khin s thng qua ngn ng lp trnh. B iu khin s nh gn. D dng trao i thong tin vi mi trng xung quanh nh: TD(text display), OP (operation), PC, PG hay mng truyn thng cng nghip, k c mng internet. Thc hin chng trnh lin tc theo vng qut.

M HNH CU TRC PHN CNG PLC S7-200

Cc n trng thi: n RUN-mu xanh: Ch nh PLC ch lm vic v thc hin chng trnh c np vo b nh chng trnh. n STOP-mu vng: Ch nh PLC ch STOP, dng chng trnh ang thc hin li (cc u ra u ch off). n SF-mu , n bo hiu h thng b hng c ngha l li phn cng hoc h iu hnh. y cn phn bit r li h thng vi li chng trnh ngi dng, khi li chng trnh ngi dng th CPU khng th nhn bit c v trc khi download xung CPU, phn mm lp trnh lm nhim v kim tra trc khi dch sang m my.

n Ix.x-mu xanh: Ch nh trng thi On/Off ca u vo s. n Qx.x-mu xanh: Ch nh trng thi On/Off ca u vo s. Port truyn thng ni tip: RS 485 protocol, 9 chn s dng cho vic phi ghp vi PC, PG, TD200, TD200C, OP, mng bin tn, mng cng nghip. Tc truyn - nhn d liu theo kiu PPI l 9600 baud. Tc truyn - nhn d liu theo kiu Freeport l 300 38400 baud.

CU TRC B NH S7-200Phn chia b nh: B nh c chia lm 4 vng c bn, hu ht cc vng nh u c kh nng c ghi ch tr vng nh c bit SM (special memory) l vng nh ch c. Vng nh chng trnh l min b nh c dng lu gi cc lnh chng trnh. Vng ny thuc kiu non-valatie c/ghi c. Vng nh tham s: l min lu gi cc tham s nh t kho, a ch trm... Cng ging nh vng chng trnh, Vng ny thuc kiu non-valatie c/ghi c. Vng d liu: c s dng ct cc d liu ca chng trnh bao gm kt quca cc php tnh, hng s c nh ngha trong chng trnh, b m truyn thng... Vng i tng: Timer, b m, b m tc cao v cc cng vo/ra tng t c t trong vng nh cui cng. Vng ny khng thuc kiu non-valatile nhng c/ghi c.

B NH TRONG V NGOI CA S7-200

IV. CP KT NI PLC PC/PPICp lp trnh cng RS232/PPI Dng cho dng S7-200 hay mn hnh cm ng ca Siemens TP170Di 3m, c th thay th 6ES7 901-3CB30-0XA0. Khng h tr khong cch truyn thng xa v trm a ch Kt ni my tnh vi PLC/chuyn i RS 232/RS 485

V. CM BIN P SUTp sut t 0 10 bar.Dng tn hiu 4-20mA.Ngun nui 10-36VDC.Bo v ni t chng nhiu.

VI. GIAO DIN VN HNH MY TD 200

TD200 l mt thit b hin th text (Text Display), giao tip vi ngi vn hnh. Thit b ny c thit k ch dng giao tip vi h PLC S7-200.Mt s c tnh ca TD200:Hin th tin nhn v cc bin ca PLCCho php iu chnh cc bin trong chng trnhC kh nng ci t thi gian thc ca PLC.

CU TO PHN CNGMn hnh hin th : LCD, phn gii 33x181pixelS dng hin th: 2S k t hin th: Max.40Cng giao tip TD200 v PLC: Cng RS485, 9 chn giao tip gia TD200 v PLC qua cp TD/CPUNgun cung cp : 24VDC. C th cp cho TD200 theo 2 cch:Ngun cp chung: cp ngun cho TD200 thng qua cp TD/CPU ( chiu di 2,5 m).Ngun cp ring : cp ngun cho TD200 thng qua u ni bn phi TD200 ( c s dng khi khong cch gia TD200 v CPU ln hn 2,5 m).Lu : khng s dng ng thi ngun cp chung v ngun cp ring cng mt lc nh vy s lm hng thit b

Cp TD/CPU:S c cp ngun

LP TRNH CHO PLC V KT NI PLC VI BIN TNPLC c lp trnh trn phn mm Microwin Step7 200.Cc bc tin hnh:C mun tng t cho PLCPLC nhn tn hiu tng t t cm bin p sut, mun tng t s chuyn tn hiu tng t v s. Lp trnh cho PLC iu khin m/tt my bm 2 v a tn hiu ra bin tn thng qua mun tng t iu chnh tc my bm 1.Kt ni PLC vi bin tn.Ci t cc thng s cho bin tn iu khin tc my bm 1

CI T CC THNG S CHO BIN TNSau khi a tn hiu PLC vo bin tn. Ta tin hnh ci t mt s thng s ca n, iu khin tc my bm nc 1, nhm n nh p sut trn ng ng.

a tn hiu tng t AQW0 vo u vo analog s 1 (+), chn s 3 ca Bin tn. Ci t thng s cho bin tn iu chnh tc my bm. P0300 = 1( ng c khng ng b)P0304 = in p nh mc ng c (V).P0305 = dng in nh mc ng c (A)P0307= cng sut nh mc ng c( kW hoc hp). Nu P0100=0 hoc 2 l kW, nu P0100=1 l hpP0308 =h s cos nh mc ca ng c.P0309= hiu sut nh mc ng c (%)P0310= tn s nh mc ng c ( Hz).P0311= tc nh mc ng c (V/ph)

P1000 =2(la chn im t tn s :im t tng t)P1080 = 0 Hz(tn s nh nht)P1082 = 50 Hz( tn s ln nht)P1120 = 10s (thi gian tng tc)P1121 = 10s (thi gian gim tc)P0756 = 0( u vo tng t ADC kiu in p n cc t 010V)

iu khin v ci t cc thng s ca bin tn thng qua mn hnh iu khin BOP-2

Pr 0000* Cai at P0300=0 tr thanh P0300=1

PP 0300* Cai at P0300=0 tr thanh P0300=1

P0* Cai at P0300=0 tr thanh P0300=1

P1* Cai at P0300=0 tr thanh P0300=1

PP 0300* Cai at P0300=0 tr thanh P0300=1

U V W U V W* au bien tan vi tai