PMCE4R-2201 系統(tǒng)邏輯功能及工作原理保護(hù)系統(tǒng)對(duì)機(jī)爐重要的熱工參量進(jìn)行超限判斷,根據(jù)超限情況發(fā)出預(yù)報(bào)或保護(hù)開關(guān)量信號(hào),以引起運(yùn)行人員注意或停機(jī)。為了使保護(hù)系統(tǒng)可靠地工作,不誤發(fā)或拒發(fā)信號(hào),設(shè)計(jì)上繼承了西門子S系列PLC的信號(hào)處理特色,即在超限判斷前必須確認(rèn)測(cè)量信號(hào)是可靠的。
為此,對(duì)同一熱工參量的信號(hào)測(cè)量回路實(shí)行冗余配置,分別接入來自程控和儀的兩路測(cè)量信號(hào)。這里,將程控來的輸入稱為左側(cè)輸入,將儀來的輸入稱為右側(cè)輸入。兩路輸入信號(hào)首先分別進(jìn)行信號(hào)的有效性(故障)診斷,只是有效的信號(hào)才可能經(jīng)超限判斷產(chǎn)生預(yù)報(bào)或保護(hù)輸出。在有故障時(shí),系統(tǒng)輸出故障狀態(tài)信號(hào)警示有關(guān)人員迅速排除故障。
PMCE4R-2201保護(hù)系統(tǒng)的工作原理及輸入輸出邏輯如下:
a.輸入的信號(hào)首先分別進(jìn)行故障診斷,診斷的項(xiàng)目為:1.信號(hào)是否超出正常時(shí)的最大可能范圍,若超出則認(rèn)為(范圍)故障;2.信號(hào)是否超出正常時(shí)的最大可能變化速率,若超出則認(rèn)為(速率)故障;3.以上兩項(xiàng)若有一項(xiàng)產(chǎn)生則認(rèn)為某側(cè)測(cè)量回路發(fā)生(通道)故障。
PMCE4R-2201以上三種故障發(fā)生后,其狀態(tài)在操作面板OP5上保持并閃爍,同時(shí)通道故障信號(hào)也輸出至集控操作臺(tái),以提醒有關(guān)人員迅速排除故障。僅當(dāng)在OP5上確認(rèn)后,故障信息才停止閃爍,但故障情況及其發(fā)生的時(shí)刻仍被保留在OP5緩沖區(qū)中供查詢。
PMCE4R-2201
PMC676RCSC-1
PMCE4R-3201
PMC610IND
PMCE4R-1200
PMCD3G-1300
PMC695TX-FWTCP
PMC677/LX
PMC676TX-PXE
PMC676SC-S
PMC676RCTX
POW1DRV-INT1MS
PMCF3-471
POPW-GBX460-01A
PMX-TOR1M
PMCSTARL-VXWM
PMCQ1R-300
PMCPCIM-4000A
PMCGA3-5AE9F0
PMCF3-3D0
PMCF3-371
PMCF3-330
PMCF3-2B1
PMCF3-260
PMCF3-1C2
PMCF3-120
PMCE4R-4201
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