Mini Duet 5+ - Part fan runs continuously

PaulHew

@phaedrux The 2 part cooling fans being fed by 24v are the ones that are permanently on now.

Phaedrux

@paulhew said in Mini Duet 5+ - Part fan runs continuously:

@phaedrux The 2 part cooling fans being fed by 24v are the ones that are permanently on now.

Ok, so when you say the tool fan is working, you mean the hotend heatsink fan?

Those 2 part cooling fans are wired to the out3 pins in series? Parallel?

And just to confirm, the extruder is still extruding ok?

PaulHew

@phaedrux The hotend heatsink fan is running on a 12V port "Out5", obviously I moved the jumper.
The 2 part cooling fans are wired together into the same port, "Out5" both sit on a 24v output. I think you would call it parallel. (Had to google it)
Extruder is fine.
Speaking to a friend, regardless of what the spec is of that LDO motor, 800ma is too high for it and should be running 400ma~. He runs his at 0.33a in Klipper values.

I think something has happened to the board as the fans were working correctly from DWC before I got around to my first prints.

T3P3Tony

@paulhew what are the two fans you are running in parallel as print cooling fans?

What happens if you connected them to out 4 instead of out 3

You need to change this line of your config.g from:

M950 F0 C"out3" Q500

to

M950 F0 C"out4" Q500

to test that. also comment out:

;M950 F2 C"out4" Q500                         ; create fan 2 on pin out5 and set its frequency
;M106 P2 C"Cooling" S1 H1 T45

As from the pictures and your config you don't appear to be using the cooling fan?

droftarts

@paulhew I think the LDO spec sheet is wrong, and it’s a 500mA motor. I have the same motor in an Orbiter extruder, and they say to run it at less than 500mA; I run mine at 450mA. See https://www.thingiverse.com/thing:4223085

What specification are the cooling fans? Running fans in parallel means that they draw the current of both fans together (in series the voltage is halved, so they run slower).

Can you take a good clear picture of the fan MOSFETs between the fan headers?

Ian

PaulHew

@t3p3tony No, I have not got round to installing the cooling fans, the Mini is open to free air.
Will try your suggestions. Thank you.

PaulHew

@droftarts Damn! That info was on Fermio's website.
They are just 2 small GDSTIME 3010 blower fans 0.05a @ 24v

I am sorry I do not know what a mosfet is. So took 2 pictures.

Thanks Ian and Tony

Regards,
Paul

PaulHew

Interesting. Did as Tony asked and moved the fans to "Out4"
Have control again!
Do each of the fan outputs have individual mosfets things now?

So it is something relevant to Out3 board side.

Just plugged the fans back in with out changing config and they are running full chat.

P.

T3P3Tony

@paulhew yeah each output has its own mosfet.

What fans are you using?

PaulHew

@t3p3tony They are just 2 small GDSTIME 3010 blower fans 0.05a @ 24v

T3P3Tony

@paulhew ok yes 0.1A '24V for both together is fine. I see its a 0.5 board and we did have some issues with mosfet soldering on those boards so it could be that (although odd it was working before).

PaulHew

@t3p3tony I do not mind sending it back and paying for it to be fixed.
Not one for messing people around. I agree it was working, so no dispute there hence why I am offering to pay.

I have heard of mosfet's during my time on the forum, do not know what one looks like.

It did get hot in that little chamber so am going to go through the wiring to make sure all is good. It was hot enough to shrink the heat shrink cable labels near the extruder!

Appreciate the help as usual gents.
Regards,
Paul.

T3P3Tony

@paulhew drop me a line tony@duet3d.com and we can take it from there.

NexxCat

@t3p3tony Sorry to intrude, but does the Driver 0 TMC2209 look odd to you? Looking at 2 separate photos, the text line above GERMANY looks odd on that one driver.

droftarts

@nexxcat Yes, there does look like there's a hole burnt into it. @PaulHew does Driver 0 work okay? Is that where the extruder motor is connected?

Ian

PaulHew

@droftarts x and y are on 0 and 1, z on 3 e, on 4.

I will have another look later when I am back.

PaulHew

@paulhew it homed alright this morning.

PaulHew

@paulhew
As close I can get to driver0

Homing is fine and believe it or not it still extrudes!

PaulHew

Update....
I took the time last night to remove the Mini 5 from my printer so I can send to Tony. Thanks @T3P3Tony
Whilst at it I checked the fan cabling and found a melt spot on one of the cables. There was also a mark on the brass where i realize now it had shorted, me being inquisitive wiped it to see what it was!

As per the LDO part number and spec sheet which is above in this thread, 800ma is way too much for this little motor, even though they say it is rated for 1amp
The motor was that hot it burnt my fingers when checking the issue, in turn had heated the brass standoffs which then melted the sheath of the fan cable that was resting on the brass. (The whole lot is in a chamber)
Also you can see the heat shrink has been shrunk by the extreme heat. I put them on loose!

All the printers I have built and used the 80% rule, i have never had this.

However lesson learnt, replace chinese cable with silicone or use a protective braid.

For those who think I did not RTFM, I did and always do! Hence how I got into this mess!

T3P3Tony

@paulhew Thanks for the update. I think its likely that the melting + short fried the Out3 mosfet but will take a look when I get your board. The stepper driver "black spot" though we will see!