PWM Fan 1 Output not working
-
Back in late July, I bought a Duet Wifi from filastruder. Only in the last couple weeks have I had time to finalize my FT-6 build and install the Duet. Everything seems to function - great in fact - except for one of the PWM fan outputs. I'm using the duet wiring kit/official connectors and I'm no slouch to crimping, but if I move the working fan from PWM Fan 0 or 2 to PWM Fan 1, the fan ceases to work and no matter what GCode I throw at it, it doesn't seem to want to spin up. I have seen it twitch a little and one time it spun SUPER slow, but that's the extent of it. Acts like a FET is working at half power or something.
I did see this: https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#G-code_controlled_fans and disabling thermostatic control didn't seem to do anything.
Is there something else I can try? Or does this board need to be replaced? I would really love that 3rd PWM fan port.
--Micah Morton
-
@micaheli sounds like a fan mosfet issue but to be sure please post your config.g.I assume you have all three fans setup the same way?
-
In can post my config.g, but it doesn't have that one configured at the moment, but I can tell you I've tried:
M107 P1 ; just to make sure it's off
M106 P1 H-1 ; to disable thermostatic control (read that in that url I posted above)
M106 P1 S255None of those things made it turn on where it did work on the other two ports.
--Micah
-
There's my config.g file
-
@T3P3Tony Any thoughts on what my next steps are?
-
I'm really at a loss here. I want to use that output and I was really banking on it working. Does anybody have anything else I can try? Is there a way to test for a bad mosfet? @T3P3Tony ? Filastruder needs an admin here to confirm this to get a replacement sent out.
--Micah
-
@micaheli As @T3P3Tony said, it sounds like a mosfet failure on the fan. If you want to test it, this thread has a good guide for testing the fan mosfet: https://forum.duet3d.com/topic/10027/duet-2-wifi-fan-pwm-0-shorted-dead-fuse-not-blown (thanks @frank26080115 ). You should only attempt to replace the mosfet yourself if you have the necessary skills and experience, because there is a risk that you may damage the PCB or other components, which would void the warranty.
If you would rather a warranty replacement, or guidance about what work you can undertake yourself without invalidating the warranty, contact Filastruder and reference this forum thread. @T3P3Tony and @dc42 have agreed to a warranty replacement.
Ian
-
@micaheli Have you unplug the fan with board powered ? Have you reverse the polarity of fan ?
If you have done one of these step you have blown a mosfet -
I have tried inverting the output to the fan through the gcode. I verified the fan's functionality and polarity on another PWM output as well as the always on outputs.
As for unplugging with the board powered, I did not do this as I typically don't work on electronics while they are powered. I've learned the hard way when I was young.
-
@droftarts said in PWM Fan 1 Output not working:
Where did they do this? I do not see such confirmation in this thread.
-
@droftarts Thanks for that! As I mentioned, I'd prefer a warranty replacement for sure. I think @T3P3Tony and @dc42 have to comment on this thread directly for filastruder to honor it.
I have the skills to replace a mosfet, but not the equipment at this time. I also would hate to void my warranty. That's half the reason I buy genuine stuff in the first place. (the other half being that I'm supporting the creator)
-
Filastruder is sending me a new unit. Thanks everybody for your help. I may make a digikey order for those fets now though, just so I have them when my warranty ends. haha.
-
@elmoret said in PWM Fan 1 Output not working:
@droftarts said in PWM Fan 1 Output not working:
Where did they do this? I do not see such confirmation in this thread.
I have that power! Mwaaaahhaahahaha....
Ian
(Part-time Duet 3D purveyor of tech support / documentation scribe / firmware test mule - but don't tell everyone!)