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ctz556
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樓主  發(fā)表于: 2018-03-24 21:14
第一次使用模擬量就翻車(chē)了,前一陣論壇求助電子尺的使用問(wèn)題http://wyqpyx.com/read-gktid-1645195.html,參考網(wǎng)友意見(jiàn),最終采用了4-20ma的兩線(xiàn)制變送器。模擬量模塊為FX3G-2AD-BD,用來(lái)獲取液壓機的位置。

問(wèn)題來(lái)了,PLC讀取的模擬量(位置)波動(dòng)非常大,基本上為不可用的狀態(tài)。液壓站采用匯川30KW伺服,伺服未使能時(shí)模擬量讀數正常,但是只要伺服使能,PLC的模擬量就一直跳動(dòng),而且液壓站上未通電的電磁閥(24VDC)的指示燈都為微亮狀態(tài)。

三相電源輸入有采用電抗器,伺服驅動(dòng)器輸出電機線(xiàn)繞了環(huán)形磁環(huán)一圈。220V電源來(lái)自隔離變壓器,電流信號模擬量變送器采用了屏蔽雙絞線(xiàn)。

幫忙分析一下應該如何處理干擾問(wèn)題,謝謝!
iujfang
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1樓  發(fā)表于: 2018-03-25 10:56
最好加一個(gè)信號隔離器,很好用的。

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