. .

Threaded View

Previous Post Previous Post   Next Post Next Post
  1. #2
    Quote Originally Posted by glynster View Post
    It has me wondering, why trace all grounds back to a single star ground point when I could simply drill and ground into this aluminium plate multiple times locally (aluminium is high conductive after all) and then connect the earth lead to the ground plate also? The entire base of the case would then be one common ground which in turn is then connected to Earth?
    No simple or easy answer to this because Noise and grounding is black art in it's self. Basicly what you trying to do is provide a path for any stray voltages to reach Ground and not feed back into the system. If you have multiple grounds then you provide alternative routes which can feed back into more senstive cables like Step & direction etc.

    While you may get away with out noise issues using the ground setup you describe then for the little effort it takes to create a Single STAR point it's not worth taking the risk. I promise if you do get affected from noise it will take 200 times longer to track down than put in the STAR point, it will also drive you mental trying to find.!!

    Regards grounding/Earthing BOB etc then you need to know the difference between AC & DC and how they work.
    In your system you have AC devices like PSU's the input side should be connected to Mains Earth often called Ground. These PSU will then Give DC output with voltage and 0V connections. The 0v is often called Gnd. This is completely different to Mains AC Ground and is local to that Voltage source.

    Your BOB, DRIVES and any other DC powered device use there own Local power source so don't need grounding. The source that creates the DC is connected to Mains Earth.

    So the only things you want going to STAR point are from AC devices like PSU's and Any shields etc.

    Edit: Here's a rough layout of how it would go with Star Ground.

    Click image for larger version. 

Name:	GND.jpg 
Views:	5248 
Size:	135.0 KB 
ID:	17483
    Last edited by JAZZCNC; 01-02-2016 at 10:21 PM.

  2. The Following 2 Users Say Thank You to JAZZCNC For This Useful Post:


Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Denford Star Turn 3
    By MarkBrown in forum Workshop & Equipment
    Replies: 2
    Last Post: 02-12-2014, 10:57 PM
  2. Ground loops and earthing
    By andy586 in forum General Electronics
    Replies: 9
    Last Post: 11-08-2014, 04:28 PM
  3. threading ground bar ends
    By dazza in forum Metalwork Discussion
    Replies: 39
    Last Post: 11-02-2014, 11:41 PM
  4. Replies: 2
    Last Post: 04-06-2012, 12:31 PM
  5. RFQ: Precision Turned/Ground parts
    By Jimmybristol in forum Projects, Jobs & Requests
    Replies: 0
    Last Post: 08-01-2011, 04:12 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •