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Titan aero fan connection

Posted by charlieRC 
Titan aero fan connection
February 11, 2019 09:39AM
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
Re: Titan aero fan connection
February 11, 2019 10:13AM
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.



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

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Re: Titan aero fan connection
February 11, 2019 10:50AM
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.
Re: Titan aero fan connection
February 12, 2019 11:53AM
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.
Re: Titan aero fan connection
February 13, 2019 09:59AM
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.



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

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].
Re: Titan aero fan connection
February 14, 2019 07:50PM
Yep! That worked after updating the firmware. Thank you very much for your help.
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