×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

MTL SD32X Grounding

MTL SD32X Grounding

MTL SD32X Grounding

(OP)
This device has a common ground with the Din rail when mounted on it. We isolate this din rail in our Turbine Control System.
The question I have is where is the best place to take this din rail to ground?
1. IE where we have shields from many 4-20 devices terminated.
2. FG which in our case is very noisy (Many motors and Ancillary devices).
3. PE which for us is power earth (low voltage)
4. 0v which we float within the control system.

All our grounds eventually wind up at the station ground where by code they are all bonded together.
Thank you in advance.
Dave

DrJorde
http://plansbyjorde.tripod.com

RE: MTL SD32X Grounding

Sounds like you're trying to circumvent the manufacturer's requirements for grounding a current-carrying line.  You should consult with the manufacturer, or get an experienced EE to do this, or you're likely to fry a bunch of electronics.

TTFN
FAQ731-376: Eng-Tips.com Forum Policies

RE: MTL SD32X Grounding

(OP)
This ground would not be energized unless there was lightning or other electrical surges. We have over 300 EE's here and they have 3 different solutions. That is why I came here to find an expert in Surge protection. WE have been using these for years and I suspect they have been grounded to all of the above at one time or another. We have never had a problem. That is not to say that all are correct. I am looking for the best answer from someone who uses these and understands them better than we do.
That was the manufacturers link I posted. It is generic in answer.
Dave
 

DrJorde
http://plansbyjorde.tripod.com

RE: MTL SD32X Grounding

(OP)
I don't know how to do that.
The search I did, turned up a closed thread on the same subject. So I just clicked on start a new thread and it placed it here. This is not power related. it has to do with grounds and very low level signals.
Dave

DrJorde
http://plansbyjorde.tripod.com

RE: MTL SD32X Grounding

I think that you're looking for "earth" ground. The page linked even states exactly that. I believe that their word choice ("earth") is perfectly intentional.

If your DIN rail is isolated for other reasons, then perhaps you could add *another* short section of DIN rail that is firmly grounded to earth ground via metallic structure.

All this is based on that it's a surge supression device and the surges are most likely to be lightning induced. The application is similar to antenna lightning protection systems that are always taken to earth ground where feasible (excluding airplanes).

Standby for any other opinions. They may be better informed than I.


 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources