I have a field powered scale sending a 4-20ma signal back to an S series AI charm located in a RIO cabinet less than 50 feet from the field device. Measuring the signal from the field device I have 4.8ma but when I terminate the field wiring to the charm base and push in the AI charm I get an open loop indication. I measured the MA signal and when the charm is pushed in the signal drops from 4.8ma to 0. When I use my Fluke 707 in the source mode to generate the same 4.8ma signal and terminate it to the same charm baseplate points I get a good signal back to DeltaV. What would cause the 4.8ma signal from the scale to drop to 0.00ma but from the same 4.8ma signal from the meter functions as it should?
In reply to Shawn Connor:
In reply to Cedric Dawnhawk:
Andre Dicaire