Jump to content
Ultimaker Community of 3D Printing Experts

Recommended Posts

Posted · UMO Fan Circuit

Hey I'm working on an e3d v6 conversion, and I'm wondering about how much current I can pull from the stock fan circuit. I plugged two 12v 0.1A fans (wired in parallel) and they didn't start spinning until 91% power, so I worry that they're drawing a lot of current from the circuit. Does anyone know the limitations of this circuit? 

  • Link to post
    Share on other sites
    Posted (edited) · UMO Fan Circuit

    Good morning.  The E3d mod and fan mods have both been done to the UMO by others here, hopefully you'll hear shortly.

     

    I've only had to repair my UMO PWM control (transistor) and am still using the original fan.  That said, you might find the following post starts you in the right direction.  The board sends 19V to the fan, so not all 12V fans will work.  As I understand it, even in parallel, you might need to manage the voltage down.

     

    Presuming for a second that the fans can handle the voltage, there is normally a pretty high threshold to start rotation, after which the setting can be dropped.  Your post doesn't say whether you experimented with lowering the power from 91% to, say 50% once the fans were running.  If they keep going and the speed lowers as requested, that would suggest that you have control of them and there is just startup to tweak.

     

    Good luck

     

    J

     

     

    Edited by JohnInOttawa
    • Like 1
    Link to post
    Share on other sites
    Posted · UMO Fan Circuit
    On 7/26/2018 at 3:30 AM, JohnInOttawa said:

     I've only had to repair my UMO PWM control (transistor) and am still using the original fan.  That said, you might find the following post starts you in the right direction.  The board sends 19V to the fan, so not all 12V fans will work.  As I understand it, even in parallel, you might need to manage the voltage down.

     

     

    In practice, I think most computer fans can take a lot more than their rated voltage due to the simple nature of their circuits. I have a friend who pushed a computer fan to over 25v before it blew up. As for longevity, I broke the original fan that came with my printer, so I got a new 50mm fan rated for 12v. It's been working fine for a few years now.

     

    I did notice that the motor of the 30mm hotend fan got rather toasty when given the full 19v, so I wired a few 330 ohm resistors into the fan lead to drop the voltage and thus the heat. 

     

    What I'm really worried about is how much current I can pull from this circuit before something on the main board fries. If I were to guess, maybe 1 amp? However, I wanted to double check before I killed something on an expensive control board. 

    Quote

    Presuming for a second that the fans can handle the voltage, there is normally a pretty high threshold to start rotation, after which the setting can be dropped.  Your post doesn't say whether you experimented with lowering the power from 91% to, say 50% once the fans were running.  If they keep going and the speed lowers as requested, that would suggest that you have control of them and there is just startup to tweak.

    That's good to know, I'm not sure if I tried that. I usually run my fans either off or 100%, but if 100% will fry a transistor, that's a good tip, thanks.

  • Link to post
    Share on other sites

    Create an account or sign in to comment

    You need to be a member in order to leave a comment

    Create an account

    Sign up for a new account in our community. It's easy!

    Register a new account

    Sign in

    Already have an account? Sign in here.

    Sign In Now
    • Our picks

      • Startups, apply for the Forward AM Innovation Award!
        Are you a startup using 3D printing? Perhaps you should continue reading... 
         
        Together with BASF we are launching the Forward AM Innovation Award - the very first global contest for startups developing new applications with 3D printing!
         
        Why apply?
        The winning startup will receive €100,000 in goods and services*, along with coaching and marketing exposure from top-notch leaders in the industry.
         

         
        Who can apply?
        Your startup creates products using Additive Manufacturing, is less than 5 years old, and has less than 50 employees. We are looking for 3D printing applications with a strong focus on innovation, sustainability and scalability.
         
        Dental aligners, shoes, tools, automotive parts, music instruments, industrial tooling and molding, medical implants, sports equipment, toys, architecture, fashion, construction... all are welcome to join!
         
        Do you have an innovative, sustainable and scalable idea that leverages the unique possibilities of 3D printing? Then it is time to apply!
        More information can be found here.
         
        Applications close on March 28th, 2021
        * What does "in goods and services" mean?
        The winner will be able to pick any item from the overall product and service portfolio of the sponsors, e.g. printers, materials, consulting, software... Choose whatever you need to accelerate your startup.
         
          • Like
        • 0 replies
      • New here? Register your Ultimaker for free 3D printer onboarding course
        Hi,
         
        Often getting started is the most difficult part of any process. A good start sets you up for success and saves you time and energy that could be spent elsewhere. That is why we have a onboarding course ready for
        Ultimaker S5 Pro Bundle, Ultimaker S5, Ultimaker S3 Ultimaker 2+ Connect.   
        They're ready for you on the Ultimaker Academy platform. All you need to do to gain access is to register your product to gain free access. 
        Ready? Register your product here in just 60 seconds.
          • Like
        • 0 replies
    ×
    ×
    • Create New...