描述
控制器(DPU或CPU)故障
(1)某電廠300MW#2機(jī)組HIACS-5000CM控制系統(tǒng)FSSS1的CPU故障,且未將控制權(quán)交出,從CPU未能切換為主控,導(dǎo)致該部分系統(tǒng)控制設(shè)備無法操作(設(shè)備保持原狀態(tài)工作)。在對主CPU執(zhí)行在線更換步序至停電時,從CUP切換主控CPU,系統(tǒng)設(shè)備受控,更換原主控CPU后系統(tǒng)一切正常。
(2)ABB早期某時間生產(chǎn)的SYMPHONY同一PCU機(jī)柜內(nèi)不同控制器之間通訊出現(xiàn)數(shù)據(jù)不一致的情況,通過升級固件這一問題得到解決;
(3)新華控制XDPS系統(tǒng)早期某批次DPU曾多次出現(xiàn)離線、死機(jī)現(xiàn)象,經(jīng)檢查為DPU卡件個別電容問題,經(jīng)升級更換卡件問題解決。
由于目前DCS的控制器均為冗余配置,大大減少了主控制器“異?!币l(fā)機(jī)組跳閘的次數(shù)。但是,一旦一對冗余的控制器同時死機(jī),將直接威脅到安全生產(chǎn),對于此類情況一定要采取措施切實(shí)避免。
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