1、PLC給信號到變頻器時,經(jīng)常出不必要的故障,比如給假信息,或者變頻器不接收信息. 由于客戶比較急,也找不到好的處理方法.也沒有專業(yè)的技術(shù)員.只好要求我們技術(shù)員趕到現(xiàn)場處理,我們檢測了變頻器,PLC,電源,設(shè)備均正常.初步認定是干擾引起.在PLC的電源模塊及輸入/輸出的電源線上接入濾波器,問題還是得不到明顯的改善,后來把變頻器和PLC的電源線,控制線分開走線,這時故障才解除..
2、,由三臺變頻器組成的調(diào)速系統(tǒng)(裝在同一個變頻柜里),出現(xiàn)如下情況:用外接的電位器調(diào)頻率時,發(fā)現(xiàn)異常,變頻器轉(zhuǎn)速產(chǎn)生波動.頻率波動也比較大.然后就會報故障. 我們到現(xiàn)場后檢查了也是查外圍電源,負載,電位器,控制線路都正常.后上電運行變頻器,在調(diào)試變頻器時,當一臺單獨運行時,工作正常不報故障,當三臺同時運行時就會出現(xiàn)異常.這就是干擾引起啊! 對策:將三臺變頻器移出變頻柜,分別裝在一個單獨的變頻柜里,電位器也分開,然后改用屏蔽線。最后干擾清除,三臺都能同時運行.
3、多段速運行。(3。7KW)變頻器單獨運行印刷機很正常,當與印刷機的送紙機同步運行時,報軟件過流故障。代理商技術(shù)員調(diào)了一天,沒有調(diào)好,就認定是我們的機器有問題,不能用要退貨。后來到現(xiàn)場維護處理,檢測了線路,變頻器都無問題??戳艘幌略O(shè)備,印刷機里有兩臺電機,一臺主電機,(就是改造的3。7KW的),還有一臺是給送紙機用的,起上下降作用。變頻器單獨運行印刷機正常,就是與送紙機同步運行時報故障。這些動做都是通過接觸器,繼電器工作。印刷機設(shè)備也沒有接地,而我們變頻器的接地也就是接在印刷機設(shè)備上,所以根本沒有接地,認定是干擾故障。
1)良好的接地。電機等強電控制系統(tǒng)的接地線必須通過接地匯流排可靠接地,微機控制板的屏蔽地,應(yīng)單獨接地。對于某些干擾嚴重的場合,建議將傳感器、I/0接口屏蔽層與控制板的控制地相連。
2)給微機控制板輸入電源加裝EMI濾波器、共模電感、高頻磁環(huán)等,可以有效抑制傳導(dǎo)干擾。另外,在輻射干擾嚴重 的場合,如周圍存在GSM、或者小靈通基站時,可以對微機控制板添加金屬網(wǎng)狀屏蔽罩進行屏蔽處理。
3)給變頻器輸入端加裝EMI 濾波器,可以有效抑制變頻器對電網(wǎng)的傳導(dǎo)干擾,加裝輸入交流和直流電抗器,可以提高功率因數(shù),減小諧波污染,綜合效果好。在某些電機與變頻器之間距離超過100 m 的場合,需要在變頻器側(cè)添加交流輸出電抗器,解決因為輸出導(dǎo)線對地分布參數(shù)造成的漏電流保護和減少對外部的輻射干擾。一個行之有效的方法就是采用鋼管穿線或者屏蔽電纜的方法,并將鋼管外殼或者電纜屏蔽層與大地可靠連接。值得注意的是在不添加交流輸出電抗器時,如果采用鋼管穿線或者屏蔽電纜的方法,增大了輸出對地的分布電容,容易出現(xiàn)過流。當然在實際應(yīng)用中一般采取其中的一種或者幾種方法。
4)對模擬傳感器檢測輸入和模擬控制信號進行電氣屏蔽和隔離。在變頻器組成的控制系統(tǒng)設(shè)計過程中,建議盡量不要采用模擬控制,特別是控制距離大于1m,跨控制柜安裝的情況下。因為變頻器一般都有多段速設(shè)定、開關(guān)頻率量輸入輸出,可以滿足要求。如果非要用模擬量控制時,建議一定采用屏蔽電纜,并在傳感器側(cè)或者變頻器側(cè)實現(xiàn)遠端一點接地。如果干擾仍舊嚴重,需要實現(xiàn)DC/DC隔離措施??梢圆捎脴藴实腄C/DC模塊,或者采用對v/f轉(zhuǎn)換光隔離,再采用頻率設(shè)定輸入的方法。 變頻器本身抗干擾問題提出幾點處理方法: 當變頻器的供電系統(tǒng)附近,存在高頻沖擊負載如電焊機、電鍍電源、電解電源或者采用滑環(huán)供電的場合,變頻器本身容易因為干擾而出現(xiàn)保護。建議用戶采用如下措施:
(1) 在變頻器輸入側(cè)添加電感和電容,構(gòu)成LC濾波網(wǎng)絡(luò)。 (2) 變頻器的電源線直接從變壓器側(cè)供電。 (3) 在條件許可的情況下,可以采用單獨的變壓器。 (4) 在采用外部開關(guān)量控制端子控制時,連接線路較長時,建議采用屏蔽電纜。當控制線路與主回路電源均在地溝中埋設(shè)時,除控制線必須采用屏蔽電纜外,主電路線路必須采用鋼管屏蔽穿線,減小彼此干擾,防止變頻器的誤動作。 (5) 在采用外部模擬量控制端子控制時,如果連接線路在1M以內(nèi),采用屏蔽電纜連接,并實施變頻器側(cè)一點接地即可;如果線路較長,現(xiàn)場干擾嚴重的場合,建議在變頻器側(cè)加裝DC/DC隔離模塊或者采用經(jīng)過V/F轉(zhuǎn)換,采用頻率指令給定模式進行控制。 (6) 在采用外部通信控制端子控制時,建議采用屏蔽雙絞線,并將變頻器側(cè)的屏蔽層接地(PE),如果干擾非常嚴重,建議將屏蔽層接控制電源地(GND)。對于RS232通信方式,注意控制線路盡量不要超過15m,如果要加長,必須隨之降低通信波特率,在100m左右時,能夠正常通信的波特率小于600bps。對于RS485通信,還必須考慮終端匹配電阻等。對于采用現(xiàn)場總線的高速控制系統(tǒng),通信電纜必須采用專用電纜,并采用多點接地的方式,才能夠提高可靠性。 以上就是干擾問題一些處理方法,希望能幫到樓主.也希望能幫到大家.
變頻器是把工頻電源(50Hz或60Hz)變換成各種頻率的交流電源,以實現(xiàn)電機的變速運行的設(shè)備。其中控制電路完成對主電路的控制,整流電路將交流電變換成直流電,直流中間電路對整流電路的輸出進行平滑濾波,逆變電路將直流電再逆變成交流電。對于如矢量控制變頻器這種需要大量運算的變頻器來說,有時還需要一個進行轉(zhuǎn)矩計算的CPU以及一些相應(yīng)的電路。
1. 整流器 ,它與單相或三相交流電源相連接,產(chǎn)生脈動的直流電壓。
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New Mitsubishi MR-JS-0B AC Servo .kW PH+1PH00-0V
MITSUBISHI FA-L9AT USPP FAL9AT
MITSUBISHI QAD-G MELSEC ANALOG INPUT MODULE
MITSUBISHI AOJ-D1 USPP AOJD1
Mitsubishi MR-J0MA1-UL Melservo AC Servo Amplifier MRJ0MA1UL
MITSUBISHI GP-0-FE USPP GP0FE
Q0HCPU Mitsubishi PLC New In Box High Speed 0K 09 I/O CPU
QJ1E1-B Mitsubishi PLC New Ethenet Module 10BASE QJ1E1B
MITSUBISHI FRZ0-.K USPP FRZ0K
MITSUBISHI AX-11-C USPP AX11C
MITSUBISHI B-AL-K NSFP BALK
MITSUBISHI A1S-ADA FNFP A1SADA
*NEW* MITSUBISHI MELSERVO MR-J-100B - AC SERVO 1 kW
Mitsubishi Programmable Controller PLC FXN-MR-ES/UL Original New in Box Free
MITSUBISHI MR-RT1 USPP MRRT1
MITSUBISHI AD-1 USPP AD1
USED MITSUBISHI BNAH0 FX-1B MAZAK CNC CIRCUIT BOARD FE
Mitsubishi A0J-ET Programmable Controller NIB
MITSUBISHI FX-MS NSFP FXMS
MITSUBISHI F-0MS-UA1
MITSUBISHI FX-AD-TC USPP FXADTC
MITSUBISHI Q0-CPU NSFP Q0CPU
Mitsubishi QDA
Mitsubishi Operation Board YZ1A- _ YZ1A _ KS-YZ-1B _ FX09C _BNAG1
New Mitsubishi Inverter FR-D0-.K-CHT -phase .KW .0A 0V
QJ1DN91 New Mitsubishi PLC Devicenet Master Card
MITSUBISHI FR-A0E-.K-UL INVERTER DRIVE FREQROL -A00
MELSEC PROGRAMMABLE CONTROLLER A0JCPU, MELSEC A0J-EDT, MELSEC A0J-EDT
MITSUBISHI HCPQNKUE NSFP HCPQNKUE
Mitsubishi Transistor Unit FXN-0MT, Melsec, #1
MITSUBISHI FRA00KUL NSFP FRA00KUL
MITSUBISHI FR-K-100BM USPP FRK100BM
MITSUBISHI HF-MP USPP HFMP
Mitsubishi MELSEC AUSCPU with A1SJ1LP1 , A1SJ1UC-R and extral
Mitsubishi PLC AUSCPU , A1SJ1PT-S , A1SX1/Y1 , A1SJ1LP1 & A1SJ1UC-R
Mitsubishi AY1C, Used, AY1CMitsubishi, Fast
Mitsubishi FX0N-0MR-DS, Used, FX0N0MRDS, Fast
Mitsubishi FX0N-0MR-ES/UL, Used, FX0N0MRESUL, Fast
Mitsubishi FXN-ER-ES/UL, New, FXNERESUL, Fast
Mitsubishi AX0Y1CEU, Used, AX0Y1CEU, Fast
Mitsubishi AJ1QBT11, Used, AJ1QBT11, Fast
Mitsubishi A0J-ET, New, A0JET, Fast
Mitsubishi A0J-EDR, New, A0JEDR, Fast