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    Duet2 wifi + ebmpapst fan wiring

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    • mitchundefined
      mitch
      last edited by

      Printer: Ender 5 Pro,
      Mainboard: Duet2 Wifi
      Extruder/Hotend: E3D 24VDC Hemera Revo
      Part Cooling Fan: 24VDC ebmpapst 5015, model RLF35-8/12N
      Bed Sensor: BL Touch

      I have an ender5 Pro that I am updating to use this new fan duct design for the Hemera Revo + 5015 epmpapst blower.
      https://rene-jurack.de/well-engineered-hemera-fan-duct-2/

      The part cooling fan that I am removing only had two leads (PWR & GND). The new fan has three leads, one for PWR (red), GND (black), and PWM (blue).

      I found the following post that describes how to connect it to the Duet2:
      https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Connecting_3_or_4_wire_fans

      My current fan connections are:
      PWM Fans V_FAN connected to Red PWR
      PWM Fans FAN0(-) connected to Black GND

      On Duet 2, for 3-wire fans, the recommended connections are:
      Red (PWR) of an always-on fan connector.
      Black (GND)
      Blue (PWM control) connect it to the FAN- pin of your chosen controlled fan connector.

      Question:
      Before I start changing connections I wanted to ask about the GND. I am attempting to connect this new fan without fishing another wire up through the to the hotend. I am only missing the GND for the new fan connection. The only GND wire I have going to the Hemera that I could splice from looks like the GND going to the BL Touch.

      I know that for a two wire PWM fan the GND is the PWM control and you cannot bond that GND with other GND wires. However, for the three wire fans I believe it will be OK to bond the GND of the part fan with the GND on the BL Touch since it is truly acting as a standard GND. I wanted to get the forum's experienced opinion on the matter. Is it OK to bond the BL Touch GND with my three wire ebmpapst GND?

      My new connections would be:
      Always On Fans V_FAN connected to Red PWR of 5015
      Splice the GND going to BL Touch and connect to GND (Black) of 5015
      PWM Fans FAN0(-) connected to Blue (PWM Control) of 5015

      T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
      • T3P3Tonyundefined
        T3P3Tony administrators @mitch
        last edited by

        @mitch said in Duet2 wifi + ebmpapst fan wiring:

        RLF35-8/12N

        that fan will use about 0.3A when on max so its likely that the ground wire of the BL touch will be suitable to carry that return current (although i would check).

        The issue you may find is that electrical noise from the fan disturbs the operation of the BLtouch. that may not be an issue if you never probe with the fan running any way.

        www.duet3d.com

        mitchundefined 1 Reply Last reply Reply Quote 0
        • mitchundefined
          mitch @T3P3Tony
          last edited by

          @T3P3Tony Thanks. I had a more accessable ground going to my filament runout sensor so I ended up using that.

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          • T3P3Tonyundefined T3P3Tony marked this topic as a question
          • T3P3Tonyundefined T3P3Tony has marked this topic as solved
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