1、PLC給信號(hào)到變頻器時(shí),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(méi)有專業(yè)的技術(shù)員.只好要求我們技術(shù)員趕到現(xiàn)場(chǎng)處理,我們檢測(cè)了變頻器,PLC,電源,設(shè)備均正常.初步認(rèn)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(wèn)題還是得不到明顯的改善,后來(lái)把變頻器和PLC的電源線,控制線分開(kāi)走線,這時(shí)故障才解除..
2、,由三臺(tái)變頻器組成的調(diào)速系統(tǒng)(裝在同一個(gè)變頻柜里),出現(xiàn)如下情況:用外接的電位器調(diào)頻率時(shí),發(fā)現(xiàn)異常,變頻器轉(zhuǎn)速產(chǎn)生波動(dòng).頻率波動(dòng)也比較大.然后就會(huì)報(bào)故障. 我們到現(xiàn)場(chǎng)后檢查了也是查外圍電源,負(fù)載,電位器,控制線路都正常.后上電運(yùn)行變頻器,在調(diào)試變頻器時(shí),當(dāng)一臺(tái)單獨(dú)運(yùn)行時(shí),工作正常不報(bào)故障,當(dāng)三臺(tái)同時(shí)運(yùn)行時(shí)就會(huì)出現(xiàn)異常.這就是干擾引起啊! 對(duì)策：將三臺(tái)變頻器移出變頻柜,分別裝在一個(gè)單獨(dú)的變頻柜里,電位器也分開(kāi),然后改用屏蔽線。最后干擾清除,三臺(tái)都能同時(shí)運(yùn)行.
3、多段速運(yùn)行。(3。7KW)變頻器單獨(dú)運(yùn)行印刷機(jī)很正常，當(dāng)與印刷機(jī)的送紙機(jī)同步運(yùn)行時(shí)，報(bào)軟件過(guò)流故障。代理商技術(shù)員調(diào)了一天，沒(méi)有調(diào)好，就認(rèn)定是我們的機(jī)器有問(wèn)題，不能用要退貨。后來(lái)到現(xiàn)場(chǎng)維護(hù)處理，檢測(cè)了線路，變頻器都無(wú)問(wèn)題。看了一下設(shè)備，印刷機(jī)里有兩臺(tái)電機(jī)，一臺(tái)主電機(jī)，(就是改造的3。7KW的)，還有一臺(tái)是給送紙機(jī)用的，起上下降作用。變頻器單獨(dú)運(yùn)行印刷機(jī)正常，就是與送紙機(jī)同步運(yùn)行時(shí)報(bào)故障。這些動(dòng)做都是通過(guò)接觸器，繼電器工作。印刷機(jī)設(shè)備也沒(méi)有接地，而我們變頻器的接地也就是接在印刷機(jī)設(shè)備上，所以根本沒(méi)有接地，認(rèn)定是干擾故障。
1)良好的接地。電機(jī)等強(qiáng)電控制系統(tǒng)的接地線必須通過(guò)接地匯流排可靠接地，微機(jī)控制板的屏蔽地，應(yīng)單獨(dú)接地。對(duì)于某些干擾嚴(yán)重的場(chǎng)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(jī)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(yán)重 的場(chǎng)合，如周圍存在GSM、或者小靈通基站時(shí)，可以對(duì)微機(jī)控制板添加金屬網(wǎng)狀屏蔽罩進(jìn)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(duì)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(jī)與變頻器之間距離超過(guò)100 m 的場(chǎng)合，需要在變頻器側(cè)添加交流輸出電抗器，解決因?yàn)檩敵鰧?dǎo)線對(duì)地分布參數(shù)造成的漏電流保護(hù)和減少對(duì)外部的輻射干擾。一個(gè)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(shí)，如果采用鋼管穿線或者屏蔽電纜的方法，增大了輸出對(duì)地的分布電容，容易出現(xiàn)過(guò)流。當(dāng)然在實(shí)際應(yīng)用中一般采取其中的一種或者幾種方法。
4)對(duì)模擬傳感器檢測(cè)輸入和模擬控制信號(hào)進(jìn)行電氣屏蔽和隔離。在變頻器組成的控制系統(tǒng)設(shè)計(jì)過(guò)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?yàn)樽冾l器一般都有多段速設(shè)定、開(kāi)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(shí)，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(shí)現(xiàn)遠(yuǎn)端一點(diǎn)接地。如果干擾仍舊嚴(yán)重，需要實(shí)現(xiàn)DC/DC隔離措施?？梢圆捎脴?biāo)準(zhǔn)的DC/DC模塊，或者采用對(duì)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(wèn)題提出幾點(diǎn)處理方法： 當(dāng)變頻器的供電系統(tǒng)附近，存在高頻沖擊負(fù)載如電焊機(jī)、電鍍電源、電解電源或者采用滑環(huán)供電的場(chǎng)合，變頻器本身容易因?yàn)楦蓴_而出現(xiàn)保護(hù)。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(dú)的變壓器。 (4) 在采用外部開(kāi)關(guān)量控制端子控制時(shí)，連接線路較長(zhǎng)時(shí)，建議采用屏蔽電纜。當(dāng)控制線路與主回路電源均在地溝中埋設(shè)時(shí)，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(dòng)作。 (5) 在采用外部模擬量控制端子控制時(shí)，如果連接線路在1M以內(nèi)，采用屏蔽電纜連接，并實(shí)施變頻器側(cè)一點(diǎn)接地即可;如果線路較長(zhǎng)，現(xiàn)場(chǎng)干擾嚴(yán)重的場(chǎng)合，建議在變頻器側(cè)加裝DC/DC隔離模塊或者采用經(jīng)過(guò)V/F轉(zhuǎn)換，采用頻率指令給定模式進(jìn)行控制。 (6) 在采用外部通信控制端子控制時(shí)，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(yán)重，建議將屏蔽層接控制電源地(GND)。對(duì)于RS232通信方式，注意控制線路盡量不要超過(guò)15m，如果要加長(zhǎng)，必須隨之降低通信波特率，在100m左右時(shí)，能夠正常通信的波特率小于600bps。對(duì)于RS485通信，還必須考慮終端匹配電阻等。對(duì)于采用現(xiàn)場(chǎng)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(diǎn)接地的方式，才能夠提高可靠性。 以上就是干擾問(wèn)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(shí)現(xiàn)電機(jī)的變速運(yùn)行的設(shè)備。其中控制電路完成對(duì)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(duì)整流電路的輸出進(jìn)行平滑濾波，逆變電路將直流電再逆變成交流電。對(duì)于如矢量控制變頻器這種需要大量運(yùn)算的變頻器來(lái)說(shuō)，有時(shí)還需要一個(gè)進(jìn)行轉(zhuǎn)矩計(jì)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(dòng)的直流電壓。
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MITSUBISHI QDD- USPP QDD
New In Box Mitsubishi PLC FXN-MR-ES/UL Programmable Logic Controller
MITSUBISHI AUSH-CPU-S1 USPP AUSHCPUS1
MITSUBISHI FR-A0-0.K-U USPP FRA00KU
MITSUBISHI FX0-1MT-DSS USPP FX01MTDSS
Mitsubishi AC Servo Motor HA 100 CBS _ HA100CBS _ 1H1CZBM _ U100
New Mitsubishi Melsec AACPU PLC Programmable Controller
Mitsubishi Remote I/O Unit FCUA-DX111 hardware Version A
Mitsubishi AC Spindle Motor Phase Induction Motor SE-E-FV _ SEEFV
MITSUBISHI MAZAK I-90A SEQUENCER BOARD.
NEW MITSUBISHI QMEM-MBS, MELSEC MB SRAM MEMORY CARD BN-S0MMCCMW 1EHN M
MITSUBISHI PD1B-1 MAZAK CNC POWER SUPPLY
MITSUBISHI ACCPU PLC CPU PROCESSOR UNIT AC100/00V MELSEC R11009
NEW IN BOX Mitsubishi Q0HCPU PROGRAMMABLE CONTROLLER
NEW IN BOX Mitsubishi Q0HCPU PROGRAMMABLE CONTROLLER
MITSUBISHI Mazak Board BNAH0 FX1-B T Rack Meldas YT 0-Day Guarantee!!
MITSUBISHI QJ1LP1- QJ1LP New in Box Free Ship
MITSUBISHI BEIJER 0090A USPP 0090A
MITSUBISHI MAZAK I-90A SEQUENCER BOARD
MITSUBISHI KY1N USPP KY1N
Mitsubishi FX-MR-ES/UL,
NEW MITSUBISHI ELECTRIC A1P-UL PLC POWER SUPPLY CA
Mitsubishi HC-SFSB AC Servo Motor .kW (free )
New MITSUBISHI GT11-QSBD-C Touch Screen Glass 100% Original LCD Display
Mitsubishi A1GOT-SBD Free Ship
MITSUBISHI A1S-D1 FNFP A1SD1
MITSUBISHI A1S-D FNFP A1SD
Mitsubishi MR-JS-00B AC Servo Drive KW
MAZAK MITSUBISHI INDEXER DRIVE XAA
Mitsubishi PLC // AACPU / A1P / AX/ AY1 /AX1 / AD1
Mitsubishi Positioning Unit QDD Original New in Box NIB Free Ship
MITSUBISHI KP USPP KP
Mitsubishi Positioning Unit QDDN Original New in Box NIB Free Ship
Mitsubishi QTD I/O Module PLC Original New in Box NIB Free Ship
MITSUBISHI A1N-CPU USPP A1NCPU
MITSUBISHI FR-U0-0.K-UP NSFP FRU00KUP
MITSUBISHI AY-1-E NSFP AY1E
MITSUBISHI A1S-DM NSFP A1SDM
Mitsubishi MW1B BNA1G1 MAZAK cnc Board MW11 WORKING - WARRANTY
Mitsubishi CNC FCA0HW chassis only with battery module MC0
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
