MDD112C-N-030-N2M-130PB2至此，故障根源終于找到。停電拆下總空氣開關(guān)，發(fā)現(xiàn)有一觸點(diǎn)燒蝕，造成接觸不良。機(jī)床不加工時(shí)，總電流小，空氣開關(guān)不良觸點(diǎn)壓降小，看上去供電正常，不易察覺；機(jī)床切削加工時(shí)，總電流大，不良觸點(diǎn)壓降相應(yīng)增大，造成伺服單元電源不正常而報(bào)警停機(jī)。
例4．進(jìn)給軸漂移的故障維修
【故障現(xiàn)象】：MDD112C-N-030-N2M-130PB2一臺(tái)配套FAGOR 8025MG，型號(hào)為XK5038-1的數(shù)控機(jī)床，工件銑削精度超差，鏜孔失圓。
【分析及處理過(guò)程】：MDD112C-N-030-N2M-130PB2查已加工件，發(fā)現(xiàn)誤差出現(xiàn)在橫向，縱 向正常；而橫向加工對(duì)應(yīng)X軸，故懷疑X軸有問題。手動(dòng)移動(dòng)X軸，發(fā)現(xiàn)X軸定位后位置坐標(biāo)示值在0.05范圍波動(dòng)，而正常波動(dòng)為0.001，同時(shí)X軸電動(dòng)機(jī) 有輕微嗡嗡聲，估計(jì)X軸漂移。打開電柜，在X驅(qū)動(dòng)單元上找到標(biāo)志為drift的電位器，仔細(xì)調(diào)節(jié)，使X軸示值波動(dòng)回復(fù)到0.001。再進(jìn)行加工，精度恢復(fù) 正常。
例5．進(jìn)給軸報(bào)警的故障維修
【故障現(xiàn)象】：一臺(tái)配套FAGOR 8025MG，型號(hào)為XK5038-1的數(shù)控機(jī)床，X軸報(bào)警，顯示器顯示“Xaxis not ready”。
【分析及處理過(guò)程】：MDD112C-N-030-N2M-130PB2送電起動(dòng)機(jī)床，正向移動(dòng)X軸，無(wú)報(bào)警；負(fù)向移動(dòng)機(jī)床，報(bào)警出現(xiàn)。打開X軸右側(cè)導(dǎo)軌護(hù)板，發(fā)現(xiàn)護(hù)板內(nèi)部有許多切屑，估計(jì)由切屑卡死引起。將護(hù)板拆下清洗，并清除內(nèi)部切屑，安裝護(hù)板后開機(jī)，機(jī)床正常。
例6．檢測(cè)信號(hào)斷線引起坐標(biāo)軸故障的維修
【故障現(xiàn)象】：MDD112C-N-030-N2M-130PB2某配套SIEMENS 8系統(tǒng)的臥式加工中心，在工作過(guò)程中機(jī)床突然停止運(yùn)行，CRT出現(xiàn)NC報(bào)警104；重新起動(dòng)機(jī)床，報(bào)警消除，可以恢復(fù)正常，但工作不久，故障重復(fù)出現(xiàn)。
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