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Blackbox and shielded cable grounding

Discussion in 'Controller Boards' started by Nametag, Nov 29, 2020.

  1. Nametag

    Nametag New
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    I am planning on using shielded cable for my stepper motors, but I don't see a point on the Blackbox controller for grounding the shielding. From my understanding, shielded cable is not very effective unless it's grounded.

    Is there an area on the controller where I can ground the shielding?

    Thanks!
     
  2. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
    Staff Member Moderator Resident Builder Builder Project Maker

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    Not grounded... Earthed. In a star config, to a solid earth spike or copper pipe into the earth outside or into the shop floor, through the slab
     
    Alex Chambers likes this.
  3. Nametag

    Nametag New
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    Thanks for the reply
    Thanks for the reply. I had seen in a build video that the shielding was being earthed through the ground on the controller (demon controller). I don't have an earth near my garage.

    Would I be better off using non-shielded cable for the stepper motors and limit switches, and only shielding the motor cable to the vfd?
     
  4. Peter Van Der Walt

    Peter Van Der Walt OpenBuilds Team
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    See docs:blackbox:faq-emi [OpenBuilds Documentation] and in particular the extra link at the bottom - goldmine of into there

    basically, shield the VFD/Spindle rather than trying to protect everything else from it.
     
    #4 Peter Van Der Walt, Nov 29, 2020
    Last edited: Nov 29, 2020
    Nametag likes this.

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