廈門市泰尼電器有限公司
主營產(chǎn)品: AB模塊PLC |
廈門市泰尼電器有限公司
主營產(chǎn)品: AB模塊PLC |
參考價(jià) | 面議 |
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更新時(shí)間:2018-04-06 17:23:41瀏覽次數(shù):219
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本文介紹了如何降低變頻器對DCS信號的干擾的措施。在這里要提醒各位,變頻器的干擾會對其它設(shè)備的運(yùn)行造成影響,所以變頻器的抗干擾措施一定要作好,才能保證生產(chǎn)系統(tǒng)的安全可靠運(yùn)行。
1.合理布線
能在相當(dāng)大程度上削弱干擾信號的強(qiáng)度,布線時(shí),各種設(shè)備的控制線應(yīng)盡量遠(yuǎn)離變頻器的輸入、輸出線。控制線在空間上,應(yīng)盡量和變頻器的輸入、輸出線交叉,是垂直交叉。
2.削弱干擾源
接入電抗器或?yàn)V波器,對小功率變頻器,成本較高,我們采用一種低成本的電磁干擾抑制方法:將電機(jī)電纜從鐵氧體環(huán)中穿過,使穿過部分導(dǎo)線的阻抗局部增大,阻止電磁干擾電流通過。如將導(dǎo)線在鐵氧體環(huán)上繞幾圈,總的電感和阻抗值將隨圈數(shù)的平方而增大。電機(jī)電纜可從鐵氧體環(huán)中穿過三次。但應(yīng)注意,連接電機(jī)和變頻器的接地線應(yīng)留在環(huán)外。
1746-NI16I---1746-NI16I
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3.對線路進(jìn)行屏蔽
變頻器到電動機(jī)之間的連接線,應(yīng)盡量穿入金屬管內(nèi),金屬管應(yīng)該接地。信號線屏蔽層不論是接公共端還是接地,都只能在一端進(jìn)行,切不可兩端都接。
4.準(zhǔn)確接地
接地線應(yīng)盡量地粗一些,接地點(diǎn)應(yīng)盡量靠近變頻器;接地線應(yīng)盡量遠(yuǎn)離電源線;變頻器所用地接地線,必須和其他設(shè)備地接地線分開;必須避免把所有設(shè)備的接地線連在一起后再接地;變頻器的接地端子不能和電源的“零線"相
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