Connect with us

Voltage regulation

Discussion in 'General Electronics Discussion' started by jesse nobles, Sep 4, 2017.

Scroll to continue with content
  1. jesse nobles

    jesse nobles

    5
    0
    Jun 10, 2017
    Look for advice on the best way to handle this setup.

    (1)12vdc 62amp source. (From a Dell server 2950)

    (15 ) Fans. Variable speed between 6vdc to 12vdc(2amp) (out of dell servers also)

    They will be used to cool individual animal cages in a straight run.

    I'd like to control the voltage/speed of fans with one knob/switch but not sure what to use? 15 fans at 12vdc would pull 30amp?

    or 2nd option just have them all run at 8vdc. Im guessing a resistor at each fan?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    10,544
    2,349
    Nov 17, 2011
    Use a PWM motor controller. This is an example. Less expensive ones can be found.
    PWM is so much more effective than resistors in this application.
     
    CDRIVE likes this.
  3. Bluejets

    Bluejets

    4,257
    907
    Oct 5, 2014
    Maybe series each pair of fans?
    Too much?
     
  4. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    You didn't mention if any of this is to be automated. In other words what determines fan RPM? The PWM Controller that Harald linked to can be controlled by means other than the on board POT; ie Thermistor control.

    Chris
     
  5. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    This approach tweaked me so I started drawing a switch over scheme from series to parallel. Damn it gets messy! :)

    Chris
     
  6. jesse nobles

    jesse nobles

    5
    0
    Jun 10, 2017
    The RPMs are controlled by voltage from what I know. Between 6 (lowspeed)to 12(highspeed) volts. Some type of automation would be nice, but manual control is fine for now.

    If I wanted to salvage a PWM can you think of anything that would have them. I can run multiple lines with less fans to reduce max current and use smaller PWMs.

    Also on a PWM. If my source is 12vdc. Do PWMs upstep voltage if they are rated 6-36vdc? Or limited by your source voltage?
     
  7. jesse nobles

    jesse nobles

    5
    0
    Jun 10, 2017
    Yes. I thought about that, but very messy.
     
  8. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

    4,960
    648
    May 8, 2012
    Yes, you can use multiple controllers Like This.

    The 12V - 40V rating is the input voltage range of the controller. It doesn't mean 12V in 40V out.

    PWM does not boost or reduce voltage to the load. They function by rapidly switching the load ON - OFF. It's called Pulse Width Modulation because the width of the ON time vs the OFF time controls the motor speed with very little loss in torque. This is far superior to a variable voltage speed control.

    Chris
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-