Blower Fan Short?

demillertime

Hi all,

I upgraded my blower fan because the wires ripped out of mine with a larger one from Amazon.

HERE: https://www.amazon.com/SoundOriginal-50x50x15mm-Humidifier-Aromatherapy-Replacement/dp/B0755BY9RH

When it turns on my printer shuts down and restarts back up. I did not cross the wires, can it not supply enough current? Even if i did cross wires wouldn't it just go in reverse?

Samuel Pinches

Where are you powering it from? If you unplug it again, is everything ok?

demillertime

I cut the old blower and soldered this in its place. Everything runs fine when I don't even use the fan. If I leave fan speed at 0 it runs fine.

demillertime

hmm. I tried turning it up slowly to see when it would cut out and it was making a slight beeping / vibrating sound and now it only blips on for a few milliseconds before restarting. 

demillertime

Further investigation shows that the Mega and LCD boot up fine with USB. Thinking I mustve blown the power supply. I have many 24v power supplies here so I may try to add one with larger amperage.

Samuel Pinches

But heating works fine??? Fan will require 1% of power compared to bed. Sounds like a damaged/faulty fan mosfet. You could try swap the fan to use the spare heater channel (it is there for a second extruder nozzle heater) to drive the fan instead.

demillertime

Found the fan wire unplugged it and machine booted up. How do I set the outputs though if I run the fan through E1?

demillertime

my engineer ego got in the way and the heat shrink melted where I soldered and was shorting... Plugged back in and now the blower is ON all the time. i may just replace the board altogether.

Hevilp

Hi,

the Hotend-Fan is on all time.
The part cooler Fan (the lower one) is powered on like you defined in the slicer.

Which one you changed? Please check which one you changed.

To change the Pins for the Fans you need to go to pin_RAMPS.h file.

Should be like this (Marlin v2)

//

// Heaters / Fans

//

#ifndef MOSFET_D_PIN

  #define MOSFET_D_PIN  -1

#endif

#ifndef RAMPS_D8_PIN

  #define RAMPS_D8_PIN   8

#endif

#ifndef RAMPS_D9_PIN

  #define RAMPS_D9_PIN   9

#endif

#ifndef RAMPS_D10_PIN

  #define RAMPS_D10_PIN 10

#endif

#define HEATER_0_PIN     RAMPS_D10_PIN

#if ENABLED(IS_RAMPS_EFB)                      // Hotend, Fan, Bed

  #define FAN_PIN        RAMPS_D9_PIN

  #define HEATER_BED_PIN RAMPS_D8_PIN

#elif ENABLED(IS_RAMPS_EEF)                    // Hotend, Hotend, Fan

  #define HEATER_1_PIN   RAMPS_D9_PIN

  #define FAN_PIN        RAMPS_D8_PIN

#elif ENABLED(IS_RAMPS_EEB)                    // Hotend, Hotend, Bed

  #define HEATER_1_PIN   RAMPS_D9_PIN

  #define HEATER_BED_PIN RAMPS_D8_PIN

#elif ENABLED(IS_RAMPS_EFF)                    // Hotend, Fan, Fan

  #define FAN_PIN        RAMPS_D9_PIN

  #define FAN1_PIN       RAMPS_D8_PIN

#elif ENABLED(IS_RAMPS_SF)                     // Spindle, Fan

  #define FAN_PIN        RAMPS_D8_PIN

#else                                          // Non-specific are "EFB" (i.e., "EFBF" or "EFBE")

  #define FAN_PIN        RAMPS_D9_PIN

  #define HEATER_BED_PIN RAMPS_D8_PIN

  #if HOTENDS == 1

    #define FAN1_PIN     MOSFET_D_PIN

  #else

    #define HEATER_1_PIN MOSFET_D_PIN

  #endif

#endif

Samuel Pinches

With the standard community firmware, you can just plug a fan into the spare mosfet socket (HE1), and use "M106 P1 S255" to turn it on. No other changes are required.