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cyh1986
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樓主  發(fā)表于: 2019-04-19 16:45
請問(wèn)大家，溫度PID控制能用接觸器接熱電阻嗎？就是PID輸出控制是開(kāi)關(guān)量的可以嗎
sjbandmm
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1樓  發(fā)表于: 2019-04-21 16:52
溫控表一般有ON_OFF模式和PID模式，ON_OFF模式只能開(kāi)關(guān)量輸出，PID模式可以輸出模擬量，也可以輸出開(kāi)關(guān)量，開(kāi)關(guān)量輸出時(shí)可以驅動(dòng)固態(tài)繼電器也可以驅動(dòng)接觸器，驅動(dòng)接觸器的時(shí)候一定要將輸出控制周期調到20S或更長(cháng)，這樣才能保證接觸器的使用壽命，使用固態(tài)繼電器調整為1-2S。
PLC控制也可以，不過(guò)需要根據PID輸出量來(lái)調整接觸器的ON-OFF時(shí)間比例。

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