Hloov qhov kub khiav kev sib txuas lus davhlau ya nyob twg resistor yuav tsum tau ua raws li plaub- cov txheej txheem: "Safe Power Off → Precise Removal → Standard Installation → Comprehensive Verification." Qhov no ua kom muaj kev ruaj ntseg rov qab los ntawm kev sib txuas lus txuas thiab zam kev ua tsis tiav thib ob los ntawm kev ua haujlwm tsis raug.
1. Kev npaj kev nyab xeeb thiab kev lees paub fais fab tuag
Fais fab tuag: tua lub ntsiab fais fab mov rau lub tshuab txhaj tshuaj molding thiab kub khiav tswj system. Ua raws li LOTO (Lockout thiab Tag) txheej txheem los tiv thaiv kev sib tsoo fais fab.
Cov Txheej Txheem Tshaj Tawm: Tos 5 feeb kom ntseeg tau tias qhov hluav taws xob seem nyob hauv kab kev sib txuas lus thiab tus tswj tau tag nrho dissipated.
Cov cuab yeej npaj:
Soldering hlau (qhov kub thiab txias 300℃± 20 degree)
Desoldering twj tso kua mis los yog desoldering daim kab xev
Multimeter (rau kev ntsuas ntsuas)
Anti- pluaj dab teg zoo li qub (yuav tsum hnav thiab hauv av)
Tshiab Resistor: 120Ω ± 1% raug, 0.25W thiab siab dua (1210 pob hlau zaj duab xis resistor pom zoo)
Ceeb toom kev nyab xeeb: Tsis txhob ua haujlwm thaum lub voj voog muaj zog kom tsis txhob cuam tshuam kev sib txuas lus lossis ua rau hluav taws xob poob.
2. Tshem tawm qhov kub nyhiab Resistor
Nrhiav qhov Terminating Resistor: Feem ntau nyob ntawm kev sib txuas lus ntawm ob lub cuab yeej ntawm qhov kawg ntawm lub npav (thawj thiab zaum kawg).
Cua sov thiab Desoldering: sib npaug ntawm cov pob qij txha ntawm ob qhov kawg ntawm cov resistor nrog cov hlau soldering, siv lub twj tso kua mis desoldering kom tshem tawm cov solder.
Maj mam tshem tawm cov qub resistor, tsis txhob rub lub zog uas tuaj yeem ua rau cov ntaub qhwv tawm.
Ntxuav cov Pads: Ntxuav cov ntaub qhwv nrog isopropyl cawv swabs kom tshem tawm cov khoom seem.
Tshawb xyuas cov pa roj carbonization, tawg, lossis cov cim qhia tsis zoo; kho cov pads yog tias tsim nyog.
Lus Cim: Yog tias tus resistor yog nto mount, nws raug nquahu kom siv qhov kub thiab txias -tswj cov hlau nplaum nrog rab phom cua kub los tiv thaiv PCB deformation vim cua sov.
3. Txhim kho tus Resistor tshiab
Resistor Xaiv Kev Pom Zoo:
Kuj: 120Ω
Lub hwj chim: Ntau dua lossis sib npaug rau 0.25W
Qhov tseeb: ± 1%
Pob: 1210 lossis loj dua yog qhov zoo dua rau kev txhim kho cua sov.
Soldering thiab Installation:
Teem ob qhov kawg ntawm cov resistor tshiab nrog cov ntaub qhwv, kom ntseeg tau tias qhov chaw tiaj tus thiab ncaj.
Siv qis- kub solder (xws li Sn63/Pb37) rau soldering; ib zaug -lub sijhawm soldering yuav tsum tsis pub tshaj 3 vib nas this. Cov pob qij txha yuav tsum du thiab tag nrho, tsis muaj cov pob qij txha txias, txuas, lossis tsis zoo soldering.
Kev txheeb xyuas kab mob:
Xyuas kom tseeb tias qhov kev txiav cov resistors tsuas yog ntsia ntawm ob qho kawg ntawm lub npav. Terminating resistors yog nruj me ntsis txwv tsis pub txuas mus rau ib tug qhev pab kiag li lawm nyob rau hauv nruab nrab. Lub shielding txheej yuav tsum nyob twj ywm hauv av ntawm ib kawg (tswj chav sab).
Tswv yim pom zoo: Test leads nrog clamps yuav siv tau los kho lub resistor ib ntus kom yooj yim soldering positioning.
4. Peb-Kev Tshawb Fawb Qib Tom Qab Hloov
① Kev ntsuas qhov tsis kam: Lub zog- tawm kev sim ntawm lub cev sib txuas
Ntsuas qhov sib npaug ntawm cov kab A thiab B siv lub multimeter. Tus nqi ib txwm yuav tsum yog kwv yees li 60Ω (ob lub 120Ω kab sib npaug).
② Waveform Observation: Saib cov teeb liab zoo nrog oscilloscope
Txuas lub oscilloscope rau cov kab sib txawv A/B tom qab fais fab tuag -rau.
Saib seb lub waveform yog ib lub voj voog meej meej, tsis muaj suab nrov, overshoot, los yog ntug distortion.
③ Kev Saib Xyuas: Saib xyuas kev sib txuas lus ruaj khov
Khiav qhov system tsawg kawg 4 teev. Tshawb xyuas PLC/SCADA cov ntaub ntawv rau qhov txawv txav xws li "kev sib txuas lus ncua sij hawm" lossis "CRC xyuas tsis ua haujlwm".
Kev lees txais: Tag nrho peb cov txheej txheem yuav tsum tau ua ua ntej kev tsim khoom txuas ntxiv tuaj yeem pib.
