Steve101 Posted February 18, 2015 Report Share Posted February 18, 2015 Making furnace temperature control application using V350-35-TR20, Type K thermocouple ( omega KQXL-116G-9 ) input to IO-ATC8 module. Temperature/process value jumps dramatically every time power is applied to heating elements, up to 100° at higher temps. When power is removed temp returns to accurate reading as verified by other controllers. Using type K shielded cable, have tried grounding shielding to furnace or at other end in box. Have many other furnaces wired in similar fashion to stand alone temperature controllers without this issue. Any Thoughts? Link to comment Share on other sites More sharing options...
AlexUT Posted February 22, 2015 Report Share Posted February 22, 2015 Hi, Please check PLC and IO modules for Ground loop. Are TC isolatedfrom body, where temperature measured. B.R. Link to comment Share on other sites More sharing options...
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