Calibrating ib qho analog tso zis module yog ib kauj ruam tseem ceeb nyob rau hauv industrial tswj systems kom paub meej tias cov lus txib tau raug hloov mus rau hauv lub cev muaj nuj nqis (xws li voltage lossis tam sim no). Cov txheej txheem tseem ceeb suav nrog xoom- taw tes thiab tag nrho- ntsuas ntsuas, software parameter configuration, thiab multi-point linear kho, thaum kawg ua kom ntseeg tau tias cov teeb liab tso tawm qhov yuam kev tseem nyob hauv qhov kev tso cai txwv.
I. Kev Npaj Ua Ntej Calibration
Ua ntej calibration, nws yog ib qho tseem ceeb los xyuas kom meej tias ob qho tib si ib puag ncig thiab cov khoom siv nyob rau hauv lub xeev ruaj khov los tiv thaiv kev ua yuam kev los ntawm lwm yam.
Fais fab-Rov sov-up:
Fais fab ntawm PLC thiab cov analog tso zis module, thiab cia lawv sov so rau tsawg kawg 15 feeb. Qhov no tso cai rau cov hluav taws xob sab hauv kom ncav cuag thermal sib npaug, yog li txo qhov cuam tshuam ntawm qhov kub thiab txias.
Kev npaj cuab yeej:
Siv siab -cov cuab yeej ntsuas qhov tseeb- xws li 6½- tus lej digital multimeter lossis ammeter precision- nrog rau qhov ntsuas qhov tseeb tsawg kawg yog ib qib siab dua li ntawm cov qauv tau sim.
Kev kuaj kab mob:
Xyuas kom meej tias cov zis terminals tau txuas ruaj khov thiab cov load impedance poob rau hauv lub module tso cai ntau yam (xws li, rau 4-20 mA tso zis, lub load kuj yuav tsum tsawg dua los yog sib npaug rau 500 Ω).
Environmental Requirements:
Ua qhov ntsuas ntsuas ntawm qhov ntsuas kub (kwv yees li 25 degree) thiab nyob rau hauv ib puag ncig tsis muaj zog electromagnetic cuam tshuam. Yog tias tsim nyog, sau cov ntaub ntawv ntsuas kub kom pab kho qhov kub thiab txias.
Tswv yim: Qee qhov siab -end modules (piv txwv li, MAXREFDES183#) txhawb nqa cov txheej txheem calibration automated, uas tuaj yeem ua rau cov txheej txheem ua haujlwm yooj yim.
II. Core Calibration Cov kauj ruam (Siv Siemens S7 Series ua piv txwv)
1. Zero-Point Calibration (4 mA lossis 0 V)
Hauv PLC qhov kev pab cuam, teeb tsa tus nqi tso tawm rau nws qhov tsawg kawg nkaus (piv txwv li, 4 mA lossis 0 V).
Siv lub multimeter los ntsuas qhov tseeb tso zis tam sim no lossis voltage.
Yog tias pom qhov sib txawv (piv txwv li, nyeem ntawm 3.9 mA), kho nws siv ib qho ntawm cov hauv qab no:
Kev Kho Kho Kho vajtse: Kho qhov "Xoom-Point Potentiometer" (Offset) nyob rau ntawm lub module kom txog thaum kev nyeem ntawv yog qhov tseeb.
Software Configuration: Hloov kho "Xoom-Point Offset Parameter" nyob rau hauv lub programming software (xws li, TIA Portal) los siv cov nyiaj them poob haujlwm.
2. Tag nrho -Scale Calibration (20 mA lossis 10 V)
Teem tus nqi PLC tso tawm rau nws qhov siab tshaj plaws (piv txwv li, 20 mA lossis 10 V). Ntsuas tus nqi tso zis tiag; Yog tias nws nyeem 19.8 mA, ua raws li kev hloov kho:
Kho vajtse Kho: Kho lub Gain potentiometer coj cov zis mus rau tag nrho cov nplai.
Software Configuration: Teem tag nrho - scale scaling factor nyob rau hauv lub software kom tiav cov proportional kho.
3. Ntau-Point Linear Calibration (Enhancing Accuracy)
Cov ntawv tso tawm ntawm tsib lub ntsiab lus tshwj xeeb-0%, 25%, 50%, 75%, thiab 100% - thiab sau cov nqi ntsuas sib xws.
Yog tias tsis yog - kev sib txawv ntawm cov kab sib txawv (piv txwv li, cov zis tsuas yog 45% thaum teem rau 50%), kho nws siv ib qho ntawm cov hauv qab no:
Software Multi-Point Correction Function: Nkag mus rau "tus nqi zoo tagnrho – ntsuas tus nqi" ua khub rau txhua qhov taw tes; lub system yuav cia li tsim ib qho kev them nyiaj nkhaus.
Code-Raws li Calibration Algorithm: Ua kom tau txais txiaj ntsig thiab them nyiaj offset logic siv C lus lossis PLC muaj nuj nqi thaiv.
III. Kev sib piv thiab xaiv cov txheej txheem Calibration
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Txoj kev |
Siv tau Scenarios |
Qhov zoo |
Qhov tsis zoo |
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Kho vajtse Potentiometer Kho |
Cov qauv qub, ceev ceev ntawm -site calibration |
Intuitive ua haujlwm; tsis muaj software txhawb nqa |
Tsawg qhov tseeb; susceptible rau tib neeg yuam kev |
|
Software Parameter Configuration |
Niaj hnub nimno PLC systems (piv txwv li, S7-1200/1500) |
Siab raug; txhawb tsis tau -linear them nyiaj |
Yuav tsum muaj kev txawj ntse hauv kev siv programming software |
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Hybrid hom |
Systems xav tau high precision |
Combines ntxhib thiab zoo tuning; balances efficiency thiab raug |
Koom nrog ntau cov kauj ruam ua haujlwm |
Cov tswv yim pom zoo: Ua ntej, siv cov khoom siv ntxhib-tuning kom tshem tawm qhov sib txawv tsis pom tseeb, tom qab ntawd siv software los ua kom zoo calibration thiab linear kho.
IV. Kev txheeb xyuas thiab cov ntaub ntawv ntawm Calibration Results
Cov txheej txheem pov thawj:
Input signals ntawm ob peb lub ntsiab lus nruab nrab (piv txwv li, 8 mA, 12 mA, 16 mA) kom paub meej tias cov khoom tso tawm tau poob rau hauv qhov kev pom zoo (feem ntau Tsawg dua lossis sib npaug rau ± 1% ntawm tag nrho cov nplai).
Saib xyuas lub kaw lus ua haujlwm kom muaj kev ruaj ntseg thiab xyuas kom meej tias tus actuator lub zog yog linear thiab tswj tau.
Parameter Txuag:
Sau cov ntsuas ntsuas rau EEPROM lossis Flash nco kom ntseeg tau tias lawv khaws cia txawm tias tom qab lub zog poob.
Kev khaws cia:
Cov ntaub ntawv teev hnub calibration, ambient kub, ntsuas cov ntaub ntawv, thiab tus neeg teb xov tooj lub npe los pab txhawb rau yav tom ntej txij nkawm thiab traceability.
