Koj cov lus nug tshwm sim nyob rau hauv lub hauv paus ntawm ib qho ntawm feem ntau vexing "pob yuam kev" ntsib nyob rau hauv industrial automation ib puag ncig! Kuv nkag siab qhov kev ntxhov siab ntawm cov khoom siv uas coj tsis zoo - ua haujlwm qee zaum thiab ua tsis tau lwm tus - lossis cov kev tsis sib xws uas tsis tau piav qhia. Dab tsi zoo li yog software glitch yuav, qhov tseeb, yog electromagnetic cuam tshuam (EMI) ntsiag to wreaking kev puas tsuaj.
Txhawm rau kom muaj kev tiv thaiv hluav taws xob tiv thaiv hluav taws xob, lub tshuab hluav taws xob kub yuav tsum siv plaub qhov kev ntsuas: kev tiv thaiv, kev lim dej, kev sib cais, thiab hauv av. Los ntawm kev tsim "peb-hauv-ib" tiv thaiv kab ke- suav nrog kev tawm tsam, kev thaiv txoj hauv kev, thiab kev tiv thaiv lub davhlau ya nyob twg- peb tuaj yeem lav qhov kev tswj qhov kub thiab txias thiab lub zog ruaj khov.
1. Shielding: Outfitting Signals nrog "Lub Cev Armor"
Lub tswv yim tseem ceeb: Thaiv spatial radiation coupling txoj kev los tiv thaiv qis -voltage signals.
Cov Hluav Taws Xob Hluav Taws Xob: Siv cov ntaub thaiv kev sib tw -pair cables los txuas cov sensors xws li thermocouples thiab RTDs. Kev sib tw - khub qauv pab tshem tawm ib feem ntawm kev cuam tshuam ntawm magnetic teb, thaum cov txheej thaiv thaiv tau zoo thaiv hluav taws xob hluav taws xob.
Control Txee: Siv tag nrho cov hlau enclosures. Nruab cov khoom siv hluav taws xob nruab nrab ntawm lub qhov rooj txee thiab lub cev tseem ceeb kom paub meej 360-degree electromagnetic foob, yog li tiv thaiv kev cuam tshuam ntawm sab nraud xov tooj cua zaus (RF).
Cov Hluav Taws Xob Hluav Taws Xob: Haum siab siab - cov cua sov tam sim no nrog cov khoom siv hlau hloov tau yooj yim lossis lub tes tsho tiv thaiv kom txo tau lawv lub peev xwm los ua "xov tooj cua" thiab hluav taws xob cuam tshuam.
Tswv yim rau kev nqis tes ua: Cov txheej thaiv tiv thaiv yuav tsum tau muab tso rau hauv ib qho chaw -tshwj xeeb, qhov taw qhia hauv av hauv lub txee tswj- kom tsis txhob tsim cov voj voog hauv av los ntawm ntau yam - taw tes hauv av, uas tuaj yeem qhia qhov chaw tshiab ntawm kev cuam tshuam.
2. Kev Lim: Tsim "Checkpoints" ntawm Lub Hwj Chim thiab Lub Teeb Pom Kev Nkag Nkag
Lub tswv yim tseem ceeb: Lim tawm cov suab nrov los ntxuav qhov zoo ntawm cov khoom siv hluav taws xob thiab cov teeb liab sib kis.
Lub zog nkag:
Txhim kho lub tshuab lim dej tshwj xeeb rau lub tshuab hluav taws xob kub khiav los tiv thaiv siab - zaus harmonics thiab cov pulses ib ntus los ntawm kab hluav taws xob.
Ua ntej siv π- hom LC cov ntxaij lim dej, uas muaj kev cuam tshuam zoo rau ob qho tib si sib txawv - hom thiab hom - hom suab nrov.
Teeb liab Channel:
Ntxiv ib qho RC qis- dhau lub voj voog lim ntawm qhov nkag ntawm qhov ntsuas kub tswj kom lim tawm qhov siab - zaus cuam tshuam cov khoom.
Rau cov cim tswj digital (xws li valve pin drives), ntiav kev sib xyaw ua ke ntawm optocoupler cais thiab Schmitt trigger shaping los txhim kho lub teeb liab - rau - suab nrov piv.
Pom zoo Configuration: Txuas lub RC snubber circuit (tseem hu ua "buffer circuit") nyob rau tib lub sijhawm nrog cov zis ntawm Solid State Relay (SSR). Qhov no ua tau zoo suppresses dV / dt thiab dI / dt transients generated thaum lub sij hawm hloov pauv, yog li txo qhov kev siv ntawm SSR tus kheej radiated emissions.
3. Kev rho tawm: Txiav qhov "Txoj Kev Txuas Txuas" ntawm kev cuam tshuam
Lub tswv yim tseem ceeb: Thaiv qhov kev nthuav tawm ntawm cov voj voog hauv av thiab sib xws - hom cuam tshuam los ntawm kev sib cais hluav taws xob.
Kev rho tawm cov teeb liab: Siv cov teeb liab cais tawm (cov teeb meem kev nyab xeeb) lossis cov I/O cais tawm kom ua tiav cov hluav taws xob sib cais ntawm thaj chaw sensors thiab tswj qhov system; qhov no yog qhov tshwj xeeb tshaj yog haum rau qhov ntev - kis tau tus mob cov xwm txheej.
Fais fab kev rho tawm: Muab cov kab hluav taws kub khiav nrog lub tshuab hluav taws xob cais tawm kom tsis txhob muaj suab nrov crosstalk txoj kev uas yuav tshwm sim thaum sib koom ib qho chaw siv hluav taws xob nrog lwm cov khoom siv.
Kev Sib Txuas Sib Txuas: Txais siv fiber ntau- kev sib txuas lus kho qhov muag los hloov qhov ntev - tooj liab cable kis tau tus mob, yog li tshem tawm tag nrho cov kev pheej hmoo ntawm electromagnetic cuam tshuam; qhov no yog qhov zoo tshaj plaws rau kev tswj hwm hauv nruab nrab ntawm ntau- kab noj hniav ua haujlwm hauv cov cheeb tsam electromagnetic complex.
4. Grounding: Tsim kom muaj tsawg-Impedance "Flood Diversion Channel"
Lub tswv yim tseem ceeb: Muab qhov muaj peev xwm siv tau ruaj khov thiab muaj txoj hauv kev tawm rau kev cuam tshuam tam sim no. Ib qho -Txoj Cai Grounding: Tag nrho cov xaim hauv av thoob plaws hauv tag nrho cov kab ke yuav tsum tau sib sau ua ke ntawm ib qho chaw hauv av kom tiv thaiv kev tsim cov voj voog hauv av.
Grounding Resistance Requirement: Lub impedance ntawm lub hauv av yuav tsum tsawg dua 4Ω los xyuas kom meej tias kev cuam tshuam lub zog yog sai sai dissipated rau hauv lub ntiaj teb.
Hierarchical Grounding Tsim:
Fais fab hauv av (cov cua sov circuits) thiab cov teeb liab hauv av (kub tswj, PLCs) yuav tsum tau sib cais.
Lawv yog qhov kawg converged ntawm lub hwj huam mov nkag point los tiv thaiv loj tam sim no fluctuations los ntawm rhiab circuitry.
Ntawm -Qhov Kev Pom Zoo: Tshawb xyuas qhov nruj ntawm cov xov hlau txuas; Kev sib txuas xoob tsis tsuas yog nce kev tiv thaiv kev tiv thaiv tab sis kuj tseem tuaj yeem tsim hluav taws xob hluav taws xob, yog li tsim kom muaj qhov cuam tshuam thib ob.
