正確選用控制元件的品種、規(guī)格是提高元件使用可靠性的關(guān)鍵。為此必須深入確切地了解和分析機(jī)床對(duì)電氣控制系統(tǒng)的要求和系統(tǒng)對(duì)控制元件的要求。并且收集和消化控制元件制造廠提供的技術(shù)材料，如果這些資料不能滿足選用的要求時(shí)，機(jī)床制造廠可按實(shí)際使用的條件對(duì)控制元件進(jìn)行試驗(yàn)以確定是否合用。由于選用不當(dāng)影響可靠性的例子有：忽視輸入或輸出的機(jī)械參數(shù)，例如選電磁鐵時(shí)未考慮所拖負(fù)載的力――行程特性，選限位開關(guān)時(shí)未考慮撞塊速度；選接觸器時(shí)未考慮點(diǎn)動(dòng)、反接制動(dòng)的工作方式；選繼電器時(shí)未考慮能做到可靠接觸的額定工作電壓和額定小工作電流；選短路保護(hù)電器（包括熔斷器）時(shí)未考慮對(duì)接觸器等觸頭的保護(hù)；選控制變壓器時(shí)未考慮漏阻抗在電磁系統(tǒng)起動(dòng)電流情況下的壓降等。
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