描述
除行程開(kāi)關(guān)ST1和ST2外,還有開(kāi)關(guān)ST3與ST4安裝在行程極限位置。當(dāng)由于某種原因工作臺(tái)到達(dá)STl與ST2位置時(shí),未能切斷電動(dòng)機(jī),工作臺(tái)將繼續(xù)移動(dòng)到極限位置,壓下ST3或ST4,此時(shí)可使電動(dòng)機(jī)停止,避免由于超出允許位置所導(dǎo)致的事故,因此ST3與ST4起超程限位保護(hù)作用。
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