描述
控制電路的接地故障容易導(dǎo)致機(jī)床的意外開(kāi)動(dòng),或是使機(jī)床產(chǎn)生危險(xiǎn)的運(yùn)動(dòng),或是妨礙機(jī)床的停止,因此,應(yīng)把控制電路的一邊連接到保護(hù)電路上。每個(gè)電磁動(dòng)作器件的線圈,信號(hào)燈或信號(hào)燈供電的變壓器原邊線圈,都必須連接在控制電路接地的一邊,各個(gè)器件的觸頭應(yīng)接在線圈和控制電路的另一邊。如果保護(hù)繼電器的觸頭與被它所控制的器件線圈之間導(dǎo)線是在同一個(gè)電柜內(nèi),該保護(hù)繼電器的觸頭可以連接在控制電路接地邊和線圈之間。
? ???當(dāng)控制電路直接連接到電源的兩相線之間,或者連接到相線和中線之間,且中線不接地,或者通過(guò)高阻抗接地,則必須采用雙極開(kāi)關(guān)來(lái)“起動(dòng)”和停止機(jī)床動(dòng)作,以防機(jī)床意外開(kāi)動(dòng)和不能停止機(jī)床運(yùn)動(dòng)所產(chǎn)生的人身危險(xiǎn)和機(jī)械損
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