MDD112D-N-030-N2M-130PB0某配套SIEMENS 8M系統(tǒng)的進口加工中心，出現(xiàn)114#報警，手冊提示為Y軸測量有故障，電纜損壞或信號不良。
【分析及處理過程】：該機測量采用海德漢直線光柵尺，根據(jù) 故障內(nèi)容查Y軸電纜正常。為判斷光柵尺是否正常，將Y軸光柵尺插到與其能配用的光柵數(shù)顯表上通電，用手轉(zhuǎn)動Y軸絲杠，發(fā)現(xiàn)Y軸坐標不變，則說明光柵尺故 障。拆下該光柵尺，發(fā)現(xiàn)一光電池線頭脫落：重新焊接好后，通電檢查，數(shù)顯表顯示跟隨光柵變化；再將光柵尺裝回機床，開機報警消除，機床恢復正常。
例2．故障現(xiàn)象：一臺配套FAGOR 8025MG，型號為XK5038-1的數(shù)控機床，X軸報警，顯示器顯示“X axis not ready”。
【分析及處理過程】：MDD112D-N-030-N2M-130PB0停電半小時后起動機床，無報警；機床 空運行時應正常，但剛切削加工即報警，故懷疑X軸伺服驅(qū)動單元有問題。打開電柜檢查X軸伺服單元，發(fā)現(xiàn)X軸有一個輸出端子發(fā)黑，懷疑氧化造成接觸不良。停 電半小時后(伺服單元內(nèi)有大容量電容，讓其將電放掉，以防觸電和損壞)用砂紙將X軸端子打光，擰緊后開機試切削，故障消除。
例3．進給軸頻繁報警的故障維修
【故障現(xiàn)象】：一臺配套FAGOR 8025MG，型號為XK5038-1的數(shù)控機床，機床頻繁出現(xiàn)進給軸報警，多則一天一次，少則5~6天一次，停機斷電半小時后開機又正常。
【分析及處理過程】：根據(jù)故障現(xiàn)象，判斷電氣接觸有問題。先查供電，將機床停下用萬用表測伺服電源BUG電壓正常，+24V供電正常；再查控制線路，CNC到PLC、到X軸伺服單元電纜接觸良好，X軸伺服到X軸電動機電纜正常；測電動機亦無斷路、短路、發(fā)熱現(xiàn)象，故確認電氣無問題。
MDD112D-N-030-N2M-130PB0再查機械傳動，用手擰X軸絲杠，轉(zhuǎn)動輕松、靈活，無阻滯、卡死現(xiàn)象，則判斷機械應該沒問題。鑒 于伺服斷電半小時后開機又正常，有時幾天不報警，故判斷伺服及電動機不應有大問題，檢查陷入困境。因任務緊，機床暫時帶病工作。后加工時無意中測量一控制 變壓器進線380V電壓，發(fā)現(xiàn)只有290V，比正常值低90V左右，且不穩(wěn)定；跟蹤查到電柜總空氣開關，測開關進線電壓正常，開關出線有兩線線電壓偏低且 波動較大；機床各軸停下時，電壓又上升至380V左右。
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