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Thread: Running 2 12v fans from the 24v ACC port...

  1. #1
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    Running 2 12v fans from the 24v ACC port...

    Hi all, I'm hoping you guys can help me figure this one out.


    Mission:
    Run two (2) IceCAP SmartFans from a single 24v ACC (two pin) port on the EB832


    Inventory:
    two (2) Smartfans 12v 0.23a
    one (1) Ly-KREE K24121.5 DC-DC Converter {In 24V - Out: 12V 1.5A}
    one (1) DC to Bare wire Accessory Cable


    Connections:
    I've connected up the Red and Black wires (matching colors) on the DC to Bare wire accessory cable to the input side of the DC to DC converter. Then snipping the plug ends off of the fans I connected the two wires with a white stripe on the side of the wire together joining this with the Yellow wire on the he output side of the DC to DC convertor and the two all black wires from the fans to the black wire on the output side of the DC to DC converter. Properly soldered the wires together and ran heat shrink tubing to protect the wires individually and then one over top on each end of the DC to DC convertor to cleanly hold each side together..


    I then connected the 24v two (2) pin connector to LinkA_2_9 and moved the slider from AUTO to ON in Fusion. I hear the mechanical click on the he EB832 and see the A Light turn on on the front of the Energy Bar.


    Problem:
    The Fans don't budge.....


    Before cutting the plug ends off I did check both fans with the included power supplies to make sure they both worked. I do admit I did not test the DC to DC convertor's output to verify it was putting out 12v once the 24v was applied.


    I mainly want to check my parts, and wiring, and logic here to see if I've thought about this correctly and wired everything up the right way....


    Thoughts criticisms suggestions... all are welcome....


    Thank you so much for reading about my adventure.
    Scott

  2. #2
    Frequent Contributor zombie's Avatar
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    Pics of wiring?

    You might be an engineer if...You have no life and can prove it mathematically.

  3. #3
    Regular Vistor
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    Quote Originally Posted by zombie View Post
    Pics of wiring?

    You might be an engineer if...You have no life and can prove it mathematically.
    IMG_0020.JPG

    I hope this is clear



    Sent from somewhere

  4. #4
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    Problem solved

    I had the negative and positive connected backwards on the output side of the DC to DC convertor.

    Live and learn... ha ha


    Sent from somewhere

  5. #5
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    What about just running the fans in series and ditch the adapter?

  6. #6
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    Quote Originally Posted by Gotfrogs View Post
    What about just running the fans in series and ditch the adapter?
    Everything I read suggested it would be better to run in parallel. However it should would work if the fans can take it. However it would be better if I wanted to drive two 12v fans at 6v each off of a 12v adapter.

    scott

  7. #7
    Frequent Contributor zombie's Avatar
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    Quote Originally Posted by Gotfrogs View Post
    What about just running the fans in series and ditch the adapter?
    That's a good way to let the magic smoke out. If the load resistance changes from a stall, difference in friction, difference in starting speed, etc, then it will not split the voltage evenly and can overvolt one of the two and let the smoke out. Voltage dividers only work with constant impedance loads.

    You might be an engineer if...You have no life and can prove it mathematically.

  8. #8
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    Agreed, Parallel plus the DC to DC convertor certainly seemed the best / safest route.

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