KEBA SC102【】KEBA SC102
KEBA SC102【】KEBA SC102是異步電機(jī)的起、保、停電路。
工作原理:按下啟動(dòng)按鈕SB2,接觸器KM得電自保,其常開(kāi)主觸點(diǎn)接通主電路,電機(jī)運(yùn)轉(zhuǎn);按下停止按鈕SB1,接觸器KM失電復(fù)位,斷開(kāi)主電路,電機(jī)停止。
采用plc控制時(shí),按鈕SB1、SB2和熱繼電器FR的觸點(diǎn)是PLC的輸入設(shè)備,接觸器KM是輸出設(shè)備。圖b)是PLC端子分配圖,c)是梯形圖電路,d)輸入輸出信號(hào)波形圖。
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使用安全PLC/DCS 及安全網(wǎng)絡(luò)的優(yōu)點(diǎn)包括:
1 機(jī)械控制更大的集成性和靈活性
2 當(dāng)標(biāo)準(zhǔn)控制層智能化時(shí),能夠進(jìn)行更好更容易的故障診斷
3 更快、更方便的維護(hù)
4 減少安裝、調(diào)試以及重新配置的費(fèi)用
5 與對(duì)于邏輯單獨(dú)使用安全繼電器相比,降低了設(shè)計(jì)和硬件成本
梯形圖原理說(shuō)明:按下起動(dòng)按鈕,I200線圈得電,其常開(kāi)觸點(diǎn)閉合使Q430接通;Q403的常開(kāi)觸點(diǎn)與I200并聯(lián)實(shí)現(xiàn)自保;按下停止按鈕或熱繼電器動(dòng)作,I201和I201的常閉觸點(diǎn)都斷開(kāi)使Q430斷電。
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