Signal Cable Screens Grounding

[Arianahmadi031]

Hi Dear Experts ,

Recently i Found An Issue about Drawing and Designing Control System Grounding Document , I Use Emerson DeltaV MD PLUS Controller DCS and i have Some Different Method about Grounding Signal Cable Screens Presented By EMERSON :

1) Emerson has Presented a Grounding Manual and it is emphasized that we must Connect Cable Screens to Chassis Ground CG( or PE) and DO NOT Connect Cable Screens to DC Ground .(Attachment 1)

2)i have a Document Regarding to a Project has been Done BY EMERSON and they Connected Cable Screen Bars to IE (Instrument Earth ) and also they Have Connected DC Power Negative(-) Pole to IE . (Attachment 2)

Can Anyone Guide Me ,

With Best Regards

A.Ahmadi

[santo_13]

Are you asking for a general opinion? or anything related to NI?

Depending on the application, grounding, and shielding can be different or the same. I would rely on manufacturer recommendations as they know the hardware design the best.