1. Got a question or need help troubleshooting? Post to the troubleshooting forum or Search the forums!

Solved dual fan wiring, fans wont work.

Discussion in 'Troubleshooting' started by Goofynoodle, Nov 28, 2016.

  1. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    I just printed a dual fan mount, bought a new 40 x 40 x 20? and spliced it onto the stock fans wiring. they both run fine when I manually turn them on, but when i'm printing, they wont come on at all. I manually turned them on during a print and the printer stopped dead, and reported a hardware malfunction. settings are at 100% fan speed, for max... and 10 for min. oh... and I lied, the first print printed 1 and a half layers .... then the fans kicked on.....then it froze up. but since then, every time I try.... no fans.
     
    #1 Goofynoodle, Nov 28, 2016
  2. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,915
    Likes Received:
    7,338
    Just a guess but the fans are either 'noisy' with RF that is interfering with the Arduino or drawing too much current for the RAMPS fan output.
     
    #2 mark tomlinson, Nov 28, 2016
  3. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    so ..... another weird problem that's unique to me. YAY.
     
    #3 Goofynoodle, Nov 28, 2016
  4. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,915
    Likes Received:
    7,338
    You can add a small relay in between the RAMPS output and the fan power, but that will limit you to ON/OFF control. Worth testing if you have a 12v relay handy to see if that sorts it. If it does look for lower power fans :)
     
    #4 mark tomlinson, Nov 28, 2016
    Goofynoodle likes this.
  5. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    maybe i'll tinker with the fan speed???? knock it down a bit to lighten the load?
     
    #5 Goofynoodle, Nov 28, 2016
    mark tomlinson likes this.
  6. mark tomlinson

    mark tomlinson ༼ つ ◕_ ◕ ༽つ
    Staff Member

    Joined:
    Feb 21, 2013
    Messages:
    23,915
    Likes Received:
    7,338
    That could certainly help as well. If it does then again -- look for lower current fans.
    If it does not help it is more likely the RF noise.
     
    #6 mark tomlinson, Nov 28, 2016
  7. Geof

    Geof Volunteer Moderator
    Staff Member

    Joined:
    Nov 9, 2015
    Messages:
    6,757
    Likes Received:
    2,339
    40x40x20 fans overpower my 40 watt heater. Are you getting a ltemp fall error in your gcode log? (you'll have to print via USB to get the error log). If so turning them down will def help like Mark says.
     
    #7 Geof, Nov 28, 2016
  8. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    Found the problem.... I made this http://www.thingiverse.com/thing:1037680 and it.s cooling off my hot end....blows right on it.o_O I preheated it and then turn the fans on and watch it go from 240 to 175 is in like 30 seconds.....but I think the robo knows when something is up and is turning off the hot end. goes slower at 50% fan....but still happens. so...damn.
     
    #8 Goofynoodle, Nov 29, 2016
  9. Geof

    Geof Volunteer Moderator
    Staff Member

    Joined:
    Nov 9, 2015
    Messages:
    6,757
    Likes Received:
    2,339
    yep the part cooler needs to blow on part not on the heater :D
     
    #9 Geof, Nov 29, 2016
  10. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    I tried a couple different fan ducts. All were hitting the bed... so this last one...I was surprised to see actually cleared it... but it looks like the front duct touches the hot end and the back one just blows right on it.
     
    #10 Goofynoodle, Nov 29, 2016
  11. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    20161129_103706.jpg
     

    Attached Files:

    #11 Goofynoodle, Nov 29, 2016
  12. Goofynoodle

    Goofynoodle Member

    Joined:
    Mar 17, 2016
    Messages:
    39
    Likes Received:
    8
    took a blowtorch to the ducts.... tweaked the plastic so it deflects more downward. so far loosing only 4 degrees on the hot end....we'll see if it errors out and kills the print in a minute.
     
    #12 Goofynoodle, Nov 29, 2016
    mark tomlinson likes this.

Share This Page