The core basis for determining if a hot runner system's signal link is interfered with is to observe whether the temperature reading exhibits periodic fluctuations, random drifts, or instantaneous abrupt changes. This can be verified by measuring the AC voltage to ground (>1V AC yog tus nqi ceeb toom), tshuaj xyuas cov teeb liab waveform distortion nrog oscilloscope, thiab tshawb xyuas hauv av thiab tiv thaiv tej yam kev mob. Feem ntau, kev cuam tshuam yog tshwm sim los ntawm cov voj voog hauv av, electromagnetic coupling, lossis shielding tsis ua haujlwm, uas tuaj yeem nyob sai sai los ntawm kev sim yooj yim.
Plaub txoj hauv kev los txiav txim qhov teeb meem txuas cuam tshuam:
1. Saib xyuas cov yam ntxwv txawv txav ntawm qhov ntsuas kub:
Lub sijhawm hloov pauv (piv txwv li, ± 5 ~ 20℃fluctuations) → Point rau 50Hz fais fab zaus hauv av voj cuam tshuam;
Kev hloov pauv tsis tu ncua → Tej zaum yuav yog vim EMI txuas lossis kev sib cuag tsis zoo;
Instantaneous rov mus rau xoom los yog tag nrho scale → Muaj zog cuam tshuam pulses ua rau txawv txav ADC sampling;
Ntau -channel synchronous fluctuations → Hauv av bounce los yog sib koom fais fab mov cuam tshuam.
2. Ntsuas qhov hluav taws xob AC rau hauv av (qhov tseem ceeb ntawm - qhov ntsuas qhov chaw): Siv lub tshuab ntsuas ntau hauv AC hom los ntsuas qhov hluav taws xob nruab nrab ntawm qhov tsis zoo ntawm qhov ntsuas kub thiab hauv av.
Yog tias qhov hluav taws xob> 1V AC: muaj qhov sib txawv tseem ceeb tshwm sim, qhov tshwm sim yuav qhia tau tias muaj kev cuam tshuam hauv av.
Qhov zoo tshaj plaws, nws yuav tsum yog <0.1V AC, qhia txog lub teeb liab ruaj khov siv hauv av.
3. Siv lub oscilloscope los saib cov teeb liab waveform: Txuas lub oscilloscope digital nrog cov bandwidth txaus rau qhov ntsuas kub tswj cov tswv yim.
Saib seb puas yog lub teeb liab thermocouple superimposed:
Sine wave (50Hz / 60Hz) → Fais fab zaus cuam tshuam;
Siab -frequency glitches los yog ringing → EMI tshwm sim los ntawm inverters los yog relays;
Kev sib tshuam pulses → Ua los ntawm cov av xoob lossis cov khoom pib pib-up/shutdown.
Qhov "dirtier" waveform, qhov cuam tshuam loj dua.
4. Txheeb xyuas qhov kev ruaj ntseg hauv av thiab thaiv kev ruaj ntseg
Paub meej tias ib qho - taw tes grounding yog siv kom tsis txhob circulating tam sim no los ntawm ntau cov ntsiab lus hauv av;
Xyuas tias ob npaug -shielded compensating conductors yog siv, nrog rau txheej txheej txuas nrog lub ntiaj teb thiab cov txheej sab hauv txuas nrog cov teeb liab hauv av ntawm ib kawg;
Yog tias cov txheej thaiv thaiv tsis yog av lossis hauv av ntawm ob qho kawg, cov nyhuv thaiv yuav ploj mus thiab cuam tshuam txawm tias yuav ua rau hnyav dua.
Tswv yim tswv yim: Txheeb xyuas qhov kev cia siab ntawm cov xaim hluav taws xob hauv lub xeev "txias" tom qab kaw, thiab tom qab ntawd ua qhov ntsuas qhov ntsuas hluav taws xob thiab waveform thaum lub kaw lus tab tom khiav kom nkag siab txog kev noj qab haus huv ntawm cov teeb liab txuas.
