584,865 active members*
4,942 visitors online*
Register for free
Login
IndustryArena Forum > MetalWorking Machines > CNC "do-it-yourself" > Toroidal CNC Power Supply/ Questions on Wiring
Results 1 to 5 of 5
  1. #1
    Join Date
    Mar 2022
    Posts
    3

    Toroidal CNC Power Supply/ Questions on Wiring

    Hello,

    I bought 2- power supplies that were supposed to be 68vdc and 12 amps. I just tested one of them and got 34 volts dc at the output. These are supposed to be older Antec units but there are no markings anywhere on them. There are 4 wires coming out of the toroid. There is a yellow/white that comes out of the toroid in the same location and a blue/orange that comes out of the toroid in the same spot. The input is a black and gray wire.

    The orange/white goes to one bridge rectifier and then to a capacitor. The blue orange does the same and then they are joined at the output terminal strip. When measuring the the output I get 34vdc and not the advertised 68vdc.

    So I am trying to troubleshoot and don't have a whole lot of knowledge on transformers. I assumed 2 things:

    1) This should have a primary voltage of 240vac and not 120vac OR
    2) It is wired in parallel and not series so I am getting half the voltage.

    Anyone have any advice on how to figure this out. I have included pictures.

    Thank You,
    Steve
    Attached Thumbnails Attached Thumbnails IMG_7439.jpg   IMG_7440.jpg   IMG_7441.jpg   IMG_7442.jpg  

    IMG_7443.jpg  

  2. #2
    Join Date
    Jan 2018
    Posts
    1516
    Quote Originally Posted by Sierevello1 View Post
    Hello,

    I bought 2- power supplies that were supposed to be 68vdc and 12 amps. I just tested one of them and got 34 volts dc at the output. These are supposed to be older Antec units but there are no markings anywhere on them. There are 4 wires coming out of the toroid. There is a yellow/white that comes out of the toroid in the same location and a blue/orange that comes out of the toroid in the same spot. The input is a black and gray wire.

    The orange/white goes to one bridge rectifier and then to a capacitor. The blue orange does the same and then they are joined at the output terminal strip. When measuring the the output I get 34vdc and not the advertised 68vdc.

    So I am trying to troubleshoot and don't have a whole lot of knowledge on transformers. I assumed 2 things:

    1) This should have a primary voltage of 240vac and not 120vac OR
    2) It is wired in parallel and not series so I am getting half the voltage.

    Anyone have any advice on how to figure this out. I have included pictures.

    Thank You,
    Steve

    That will be one of those number 2's.

    Both input and output will have a series option.
    34+34 series = 68
    120+120 series = 240

    Both will either be parallel or single atm.
    You need to find the datasheet for it to make wiring easier to figure out

    Image is not there.

  3. #3
    Join Date
    Mar 2022
    Posts
    3

    Re: Toroidal CNC Power Supply/ Questions on Wiring

    Sorry,

    It looked like pics were there when I posted. I will have to post them separately I think.

    - - - Updated - - -

    Next Picture:
    Attached Thumbnails Attached Thumbnails IMG_7440.jpg  

  4. #4
    Join Date
    Mar 2022
    Posts
    3

    Re: Toroidal CNC Power Supply/ Questions on Wiring

    There is only a single input: It is a black and gray wire.
    Attached Thumbnails Attached Thumbnails IMG_7441.jpg   IMG_7443.jpg   IMG_7443_r.jpg  

  5. #5
    Join Date
    Nov 2013
    Posts
    4282

    Re: Toroidal CNC Power Supply/ Questions on Wiring

    Hi,
    looking at your picture you have two output windings, the Orange/White winding and the Blue/Yellow winding. The two rectifiers and filter capacitors are in parallel to the output terminals in the centre.
    You need to rewire them so that they are in series.


    I would not fiddle with the primary, if you wire them in series opposing you will have trouble, whereas series inline no trouble, ie you need to know the phasing of the windings. Easy to do, just
    not easy to explain. At this stage I would guess that you don't need to touch it anyway.

    Craig

Posting Permissions

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