CC-PCF901 51405047-175
CC-PCF901 51405047-175
CC-PCF901 51405047-175
:祖巧麗
:
1.故障現(xiàn)象:主軸電動(dòng)機(jī)M1不能起動(dòng)。
原因分析:
①控制電路沒(méi)有電壓。
②控制線路中的熔斷器FU5熔斷。
③接觸器KM1未吸合,按起動(dòng)按鈕SB2,接觸器KM1若不動(dòng)作,故障必定在控制電路,如按鈕SB1、SB2的觸頭接觸不良,接觸器線圈斷線,就會(huì)導(dǎo)致KM1不能通電動(dòng)作。
當(dāng)按SB2后,若接觸器吸合,但主軸電動(dòng)機(jī)不能起動(dòng),故障原因必定在主線路中,可依次檢查接觸器KM1主觸點(diǎn)及三相電動(dòng)機(jī)的接線端子等是否接觸良好。
2.故障現(xiàn)象:主軸電動(dòng)機(jī)不能停轉(zhuǎn)。
原因分析:
這類故障多數(shù)是由于接觸器KM1的鐵芯面上的油污使鐵芯不能釋放或KM1的主觸點(diǎn)發(fā)生熔焊,或停止按鈕SB1的常閉觸點(diǎn)短路所造成的。應(yīng)切斷電源,清潔鐵芯極面的污垢或更換觸點(diǎn),即可排除故障。
3.故障現(xiàn)象:主軸電動(dòng)機(jī)的運(yùn)轉(zhuǎn)不能自鎖。
原因分析:
當(dāng)按下按鈕SB2時(shí),電動(dòng)機(jī)能運(yùn)轉(zhuǎn),但放松按鈕后電動(dòng)機(jī)即停轉(zhuǎn),是由于接觸器KM1的輔助常開(kāi)觸頭接觸不良或位置偏移、卡阻現(xiàn)象引起的故障。這時(shí)只要將接觸器KM1的輔助常開(kāi)觸點(diǎn)進(jìn)行修整或更換即可排除故障。輔助常開(kāi)觸點(diǎn)的連接導(dǎo)線松脫或斷裂也會(huì)使電動(dòng)機(jī)不能自鎖。
4.故障現(xiàn)象:刀架快速移動(dòng)電動(dòng)機(jī)不能運(yùn)轉(zhuǎn)
原因分析:
按點(diǎn)動(dòng)按鈕SB3,接觸器KM3未吸合,故障必然在控制線路中,這時(shí)可檢查點(diǎn)動(dòng)按鈕SB3,接觸器KM3的線圈是否斷路。
5.故障現(xiàn)象:M1能起動(dòng),不能能耗制動(dòng)
起動(dòng)主軸電動(dòng)機(jī)M1后,若要實(shí)現(xiàn)能耗制動(dòng),只需踩下行程開(kāi)關(guān)SQ1即可。若踩下行程開(kāi)關(guān)SQ1,不能實(shí)現(xiàn)能耗制動(dòng),其故障現(xiàn)象通常有兩種,一種是電動(dòng)機(jī)M1能自然停車,另一種是電動(dòng)機(jī)M1不能停車,仍然轉(zhuǎn)動(dòng)不停。
原因分析:
踩下行程開(kāi)關(guān)SQ1,不能實(shí)現(xiàn)能耗制動(dòng),其故障范圍可能在主電路,也可能在控制電路中電路。有3種方法。
①由故障現(xiàn)象確定 當(dāng)踩下行程開(kāi)關(guān)SQ1時(shí),若電動(dòng)機(jī)能自然停車,說(shuō)明控制電路中KT(02-03)能斷開(kāi),時(shí)間繼電器KT線圈得過(guò)電,不能制動(dòng)的原因在于接觸器KM4是否動(dòng)作。KM4動(dòng)作,故障點(diǎn)在主電路中;KM4不動(dòng)作,故障點(diǎn)在控制電路中。當(dāng)踩下行程開(kāi)關(guān)SQ1時(shí),若電動(dòng)機(jī)能不能停車,說(shuō)明控制電路中KT(02-03)不能斷開(kāi),致使接觸器KM1線圈不能斷電釋放,從而造成電動(dòng)機(jī)不停車,其故障點(diǎn)在控制電路中,這時(shí)可以檢查繼電器KT線圈是否得電。
②由電器的動(dòng)作情況確定 當(dāng)踩下行程開(kāi)關(guān)SQ1進(jìn)行能耗制動(dòng)時(shí),反復(fù)觀察電器KT和KM4的銜鐵有無(wú)吸合動(dòng)作。若KT和KM4的銜鐵先后吸合,則故障點(diǎn)肯定在主電路的能耗制動(dòng)支路中;KT和KM4的銜鐵只要有一個(gè)不吸合,則故障點(diǎn)必在控制電路的能耗制動(dòng)支路中。
③強(qiáng)行使接觸器KM4的銜鐵吸合 若此時(shí)仍不能實(shí)現(xiàn)能耗制動(dòng),說(shuō)明故障點(diǎn)在主電路;若此時(shí)可以實(shí)現(xiàn)能耗制動(dòng),則不能實(shí)現(xiàn)能耗制動(dòng)的故障原因不在主電路,必在控制電路中。
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