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OKUMA E4809-907-059-A 基于plc的線路改造
plc選型
根據(jù)設(shè)計(jì)要求、控制要求,選定plc的型號(hào)為:ec-08m08r,它是由黃石科威公司生產(chǎn)的e系列plc(與三菱fx2n系列兼容),擁有8路輸入、8路(繼電器)輸出,而本例實(shí)際只需要3路輸入、6路輸出,輸出留有約1/3的余量,輸入所留余量超出1/3,完全滿足要求:擁有8k步的內(nèi)存容量,而本例用戶程序的容量估計(jì)在20步左右,完全夠用;支持內(nèi)置canbus、485、通信功能,有利于今后與其它設(shè)備進(jìn)行聯(lián)網(wǎng)通信。
溫度采集單元
采用熱電阻cu100對(duì)變壓器繞組和鐵心溫度進(jìn)行測(cè)量。熱電阻是利用物質(zhì)在溫度變化時(shí),其電阻也隨著發(fā)生變化的特征來測(cè)量溫度。測(cè)量范圍0~150℃,r0=100ω。
人機(jī)界面(hmi)
人機(jī)界面用來顯示每臺(tái)變壓器的溫度,并可以方便的設(shè)置系統(tǒng)的參數(shù),如報(bào)警溫度值,切除負(fù)荷溫度值,啟/停風(fēng)扇溫度值等參數(shù)??梢詫?shí)時(shí)查看每臺(tái)變壓器的繞組和鐵心的溫度,并可以顯示變壓器負(fù)荷和溫度關(guān)系曲線。必要時(shí)還可通過hmi上的按鈕,手動(dòng)啟/停風(fēng)機(jī),消除報(bào)警及切除負(fù)荷等操作。在服務(wù)器上,記錄著各種報(bào)警信息及故障發(fā)生時(shí)的各相溫度值、時(shí)間等信息,可按時(shí)間條件進(jìn)行查詢,并根據(jù)需要進(jìn)行打印和負(fù)荷圖表輸出。該系統(tǒng)中的數(shù)據(jù)采集處理、風(fēng)機(jī)運(yùn)行和故障報(bào)警由plc和hmi通過編制的相應(yīng)程序來完成。
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