I probably should know this but I don’t.

I am configuring a newly built CoreXY printer withe the Duet WiFi and the E3d titan arrow 24v. The titan comes with a 24v fan (I assume - no indicator on the fan). Is it safe or appropriate to use any of the full on or pwm fan ports on the Duet?

I will also be using a 24v berd air pump, and I’ve been told that it’s safe to use on the duet fan ports. Does this somehow complicate concerns about using these ports? Is there anything I should know before hooking these two devices up?

Charlie

The Titan Aero is available with either 12V or 24V fan. Check which version you have. If the voltage matches your Duet VIN voltage then I suggest you connect it to the Fan 1 output.

You can't connect the Berd Air motor directly to a fan output because the DC motor has a high starting current, more than the 3.5A rating of the mosfet. Either use the optional E-switch module, or if you are not using the E1 heater output then you can connect the motor and a flyback diode to that output.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Hmmmm... so what someone said about the newest duet WiFi having a larger misfit that allowed direct connection of the berd air was incorrect... or I misunderstood.
Glad you clearified that. Thanks.

Ok, I hooked up the Berd air to the Duet E1 Heater connector being careful about polarity. I added a fly-back diode. I went into the webcontrol app and I still did not see an option for any heater beyond heater1. I am unclear on where I should be able to control this. I went into config.g and modifed by copying the p1 lines to p2 (last two lines below). This was just a shot in the dark.

; Heaters
M305 P0 T100000 B4138 R4700                        ; Set thermistor + ADC parameters for heater 0
M143 H0 S120                                       ; Set temperature limit for heater 0 to 120C
M305 P1 T100000 B4138 R4700                        ; Set thermistor + ADC parameters for heater 1
M143 H1 S280                                       ; Set temperature limit for heater 1 to 280C
M305 P2 T100000 B4138 R4700                        ; Set thermistor + ADC parameters for heater 2
M143 H2 S280

but still, webcontrol only saw heater 0 and heater 1. I looked for a way to add another heater in the interface, but did not see it.

What am I missing???

Edited 1 time(s). Last edit at 02/12/2019 12:57PM by charlieRC.

Add these commands to config.g to redirect fan 0 to the E1 heater output:

M307 H2 A-1 C-1 D-1 ; disable heater 2 to free it up
M106 P0 A2 ; redirect fan 0 to heater 2 output

You must be running firmware 2.02 for this to work.

Edited 1 time(s). Last edit at 02/13/2019 09:59AM by dc42.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

Yep! That worked after updating the firmware. Thank you very much for your help.