Mainboard 6HC (with SBC) does not start with all Fans Connected.
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Hi Duet Minds!
I had my Duet 6HC running with a Fan (2Wire) connected to OUT_4. This Fan is for heated chamber and only sometimes used. I now added 2 more fans (3Wire) to cool the XY Motors on OUT_5 and OUT_6. The Jumper is set to 12V.When I start the Board now it will not boot but when I disconnect any of the two new fans before startup it will boot just fine. After boot I can connect them again and control them without any issues.
The Manual States there should not be anything connected to VFUSED if the Jumper is set to 12V and I don't have anything connected there.
Any Ideas what could cause this or what to look out?
Thanks!
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@baua1024 sounds like you have it wired incorrectly and are shorting the 12v to ground
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@jay_s_uk I thought about that too but wonder why I have no Problem using the fans after the Boot then.
I connected Positive Wire to "V_OUTLC1", "Tachowire to "out5.tach" and the Groundwire to "out5".The documentation says this is PWM V_FAN. Do I need to set something up in config to change the Fan Type to Voltage Controlled instead of PWM maybe?
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@baua1024 do those fans try to start up as soon as you power up the board? How much current do those fans draw when starting?
The maximum allowable current draw from the 12V on-board regulator is 0.8A. If you exceed that then the regulator may go into short-circuit detection mode. Without the 12V supply, the 12V fans and the stepper drivers won't work, but everything else should.
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@dc42 They didn't try to start up directly after powering on the board. However i tried a bit around and after removing the TACH pin the board has no issue starting up. Fans are working as expected now. Since I do not need the TACH as they are fully on anyways I can leave it like this. Not sure why it was causing the issue though.
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@baua1024 said in Mainboard 6HC (with SBC) does not start with all Fans Connected.:
I connected Positive Wire to "V_OUTLC1", "Tachowire to "out5.tach" and the Groundwire to "out5".
A 3-wire fan has GND, VIN and a PWM signal line to control the RPM. Fans with a forth line add a tacho signal for RPM feedback, but this one can be omitted.
On OUT 5, you should connect GND to GND, VIN to V_OUTLC1 (assuming you jumpered that to 12V), and PWM to out5.
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@infiniteloop I'm actually quite sure that a 3 Pin Fans third wire is Tacho signal and only the 4 Pin Fans are PWM controllable. The Speed is controlled via the supplied Voltage. https://digitalworld839.com/3-pin-vs-4-pin-fan-difference-between/
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@baua1024 said in Mainboard 6HC (with SBC) does not start with all Fans Connected.:
I'm actually quite sure that a 3 Pin Fans third wire is Tacho signal
Of course you are right, but the 3-pin fans described in your link are quite outdated. In the past couple of years, I only came across 3-wire fans (but with a 4-pin connector), who are in fact controlled by a PWM signal. There's just the tacho signal missing. Interestingly, these fans even run without PWM attached, but then, they don't like pulsed voltages. As I understand your posts, that's quite similar to the behaviour you describe.
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@infiniteloop That's interesting! I didn't came across these yet. The Ones I bought had 3 Pin headers and are the following: https://www.blacknoise.com/datas/downloads/datasheets/TData_BSF40_122012_de_en.pdf
Unfortunately they don't mention anything about the pinout So I assumed they have a Tacho Signal. -
@baua1024 said in Mainboard 6HC (with SBC) does not start with all Fans Connected.:
That's interesting! I didn't came across these yet.
Arctic PWM PST series - these are indeed 4-wire fans, but the intention is to chain them in a way that you can control all of them with a single PWM signal - ignoring the tacho signals. So, at the controller, you end up with 3 wires.
