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經(jīng)驗(yàn)PID整定參數(shù)預(yù)置
對(duì)介質(zhì)為流體(氣體、液體)情況,經(jīng)驗(yàn)PID整定參數(shù)參考如下,(在出所前在軟件組態(tài)中要設(shè)置好,到現(xiàn)場(chǎng)再細(xì)調(diào)或不動(dòng)):
1、對(duì)流量調(diào)節(jié)(F):
一般P=120~200%,I=50~100S,D=0S;
對(duì)防喘振系統(tǒng):一般P=120~200%,I=20~40S,D=15~40S;
2、對(duì)壓力調(diào)節(jié)(P):
一般P=120~180%,I=50~100S,D=0S;
對(duì)放空系統(tǒng):一般P=80~160%,I=20~60S,D=15~40S;
3、對(duì)液位調(diào)節(jié)(L):
1]、大容器(直徑4米、高2米以上塔罐):一般P=80~120%,I=200~900S,D=0S;
2]、中容器(直徑2--4米、高1.5--2米塔罐):一般P=100~160%,I=80~400S,D=0S;
3]、小容器(直徑2米、高1.5米以下塔罐):一般P=120~300%,I=60~200S,D=0S;
4、對(duì)溫度調(diào)節(jié)(T):
一般P=120~260%,I=50~200S,D=20~60S;
上述參數(shù)是經(jīng)驗(yàn)性的東西,不是的。另外實(shí)際中,有時(shí)一個(gè)調(diào)節(jié)系統(tǒng)工藝過(guò)程對(duì)象或閥門(定位器)存在問(wèn)題,也能靠改變PID參數(shù)予以克服,使自動(dòng)投入。投自動(dòng)需要耐心觀察、不斷修正。實(shí)踐中能否投入自動(dòng),關(guān)鍵的是閥門(定位器)、執(zhí)行器好用,動(dòng)作靈活。
在一個(gè)串級(jí)調(diào)節(jié)系統(tǒng)(例如:有2個(gè)調(diào)節(jié)器)中,整個(gè)內(nèi)環(huán)(副調(diào),其Ko1*Kv1*Kc1>0)相當(dāng)于主環(huán)的Kv,它始終為正。PID參數(shù)整定的結(jié)果:觀察曲線,一般為一階特性即可(當(dāng)然理論上為二階衰減特性)。
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MEASUREX 05423800 Rev.B Board (588)
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MEASUREX 05424800/C PC BOARD
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MEASUREX 08361901 REV 8