Grounding for dummies

Discussion in 'General Electronics Chat' started by RandomDude, May 28, 2008.

  1. RandomDude

    Thread Starter New Member

    May 28, 2008
    3
    0
    Hi,

    You'll most likely be appalled at the ridiculous simplicity of this problem,
    but I'm entirely new to this, so please forgive me :D

    I need to replace an AC/DC converter within a switch.
    The new converter has 5 connectors:
    AC/L AC/N Ground VDC5+ VDC5-

    1. Question:
    Am I to connect the ground of the converter to the same ground
    which is connected to the switch's casing?

    2. Question:
    The switch has 3 cables running to the converter.
    Red, black and white.

    I guess red should be VDC5+, white VDC5- and black is the ground.

    Is it ok to attach the black cable to the same ground as the converter?


    Thanks for your help.
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    15,815
    282
    Could you supply some additional information. There are several interpretations of AC/DC converter. And one "within a switch" leaves me clueless.
     
  3. RandomDude

    Thread Starter New Member

    May 28, 2008
    3
    0
  4. Pich

    Active Member

    Mar 11, 2008
    119
    4
    Question 1 Attach the ground of the converter to the wire that is attached to the case (green) on the switch.
    Question 2 as a rule for DC red would be positive and black negative (North America) but that is not always the case. I would not connect power without knowing the polarity of the power plug. Also i would not advise hooking up the DC side to ground unless the third wire is designated as chassis ground.
     
  5. RandomDude

    Thread Starter New Member

    May 28, 2008
    3
    0
    Thank you. That gets me a step further.

    I guess I have no way of finding out the polarity,
    because there are no markings on the circuit boards
    themselves, but the switch is considered 'damgaged
    beyond repair' anyway, so I guess I'll just give it a try.

    If it is not advisable to directly connect the black/DC-ground
    to the AC-ground, then is there any another simple way to
    wire it to something in order to make it work?
     
  6. Pich

    Active Member

    Mar 11, 2008
    119
    4
    One way find the polarity is to look at the circuit board to see if there is a filtering capacitor accross the power input, then follow the traces back to the connector.
     
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