12/12/2017 9:52 AM | |
Posts: 2 Rating: (0) |
Dear Sir/Madam We have water treatment unit in our boiler plant with: PLC 224 DC/DC/DC ( 214-1AD21-0XBO) Expansion module EM235 AI4/AO1*12Bit (235-0KD22-0XA0).On expansion module is connected: • Pressure transducer RA A+,A-, shielded • Temperature sensor B-,B+, grounded on B- • Temperature sensor C-,C+, grounded on C- Configuration swich:1,0,1,1,0,0. Distance is 2-3 metars between EM235 and sensors. Usually ambient temperature when equipment work is 30°C. But after 15 years excelent work this winter right after weekend pause, when ambient temperature is are going down, at the start we have on all 3 analog indicators situation of zero values. If we heat panel on temperature cc25°C, then everything is OK. Any kind of suggestion is welcome? ------------------------------------------------------------------------------------------ |
Last edited by: Jen_Moderator at: 12/12/2017 1:13:37 PMNew subject after splitting |
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