Honeywell 4DP7APX1D21E二級(jí)故障顯示在中心的控制大屏幕監(jiān)視器上,設(shè)備出現(xiàn)故障時(shí)有文字顯示故障類型,工藝流程圖上對(duì)應(yīng)設(shè)備閃爍。三級(jí)故障顯示在中心控制室信號(hào)箱內(nèi),出現(xiàn)故障時(shí)信號(hào)箱聲光報(bào)警,提示及時(shí)處理。 ⑵提高輸入信號(hào)可靠性。①硬件。選用可靠性較高的變送器和開(kāi)關(guān),防止各種原因引起的傳送線路短路、斷路或接觸不良。②軟件。在程序設(shè)計(jì)中加數(shù)字濾波程序,增加輸入信號(hào)的可靠性;現(xiàn)場(chǎng)輸入觸點(diǎn)后加一定時(shí)器,其定時(shí)時(shí)間根據(jù)觸點(diǎn)抖動(dòng)情況和系統(tǒng)要求及相應(yīng)速度確定,保證觸點(diǎn)穩(wěn)定閉合后才有其它響應(yīng);模擬信號(hào)濾波采用下法:對(duì)現(xiàn)場(chǎng)信號(hào)連續(xù)采樣3次,其間隔由A/D轉(zhuǎn)換速度和模擬信號(hào)變化速度決定,去掉最大、最小值,保留中間值存放在數(shù)據(jù)寄存器中;程序設(shè)計(jì)時(shí)可利用信號(hào)間關(guān)系判斷信號(hào)可靠程度,如貯罐上下液位保護(hù)的開(kāi)關(guān)動(dòng)作發(fā)出信號(hào)給可編程控制器,將此信號(hào)與液位計(jì)信號(hào)對(duì)比正確說(shuō)明真實(shí),反之可能極限開(kāi)關(guān)故障或傳送信號(hào)線路故障;系統(tǒng)功能表上有時(shí)不出現(xiàn)互鎖,但為了提高可靠性在編程時(shí)必須加以互鎖。
Honeywell 4DP7APX1D21E⑶執(zhí)行機(jī)構(gòu)。負(fù)載由接觸器控制時(shí),啟動(dòng)或停止這類負(fù)載轉(zhuǎn)為對(duì)接觸器線圈控制,吸合、釋放可靠;開(kāi)啟或關(guān)閉閥門時(shí),關(guān)閉時(shí)間根據(jù)閥門開(kāi)度而不同,設(shè)延時(shí)又檢測(cè)不到開(kāi)或關(guān)到位的信號(hào),如信號(hào)不能準(zhǔn)確返給可編程控制器則閥門可能有故障。
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