Turn off heatskin fan with DWC??

peirof

mmm....

Strange behavior ....

To test the fans, I have done some tests. I have them set up like this in the config.g

; GCODE FAN
M106 P0 S1 H1 I0 T80; - Heatskin's
M106 P1 S0 H-1; Layer 02
M106 P2 S0 H-1; layer 01

The first thing I have done, is to pass them all as a layer, to be able to control them with the DWC, so I have done a Macro:

M106 P0 S0 H-1; Heatskin
M106 P1 S0 H-1; Layer 02
M106 P2 S0 H-1; Layer 01


M106 P0 S1; Power On Fan
M106 P1 S1; Power On Fan
M106 P2 S1; Power On Fan

I turn on the printer, and run the macro ... the three fans should be put into operation ... well, NO, just one.

Things I have tried:

I have connected the 3 fans, the shocket that works, and the fans go. That rules out a fan malfunction, as well as a bad polarity.
I have tested with a multimeter the voltage in the shockets, directly on the Duet board. When the printer is turned on the voltage is practically 0 ... but when executing the macro, the voltage is 24.XX in the FAN0 and FAN1 shockets ... But 9.xx in the FAN2 socket .... But it doesn't matter if only 1 of the 3 lights up, the others remain off, it should turn on 2 at 100% speed and the other at 1/3 of its speed.

Do not?

What can i try? I have already ruled out that the fans do not work and that the cable that connects them with DUET is badly crushed or damaged, connecting them to the shocket that IS going ...

peirof

Some idea I can try?

peirof

Hi,

I have do some photos....

I have changed all fans, to layers fans... And power on with a macro....

FAN 2

 Fan connected to this shocket, don't turn

FAN 1

 FAN CONNECTED TO THIS SOCKET TURN, the only.

FAN 0

 Fan connected to this shocket, don't turn

pipersw

The mosfet of fan outputs are maybe defective. Try to change them

peirof

@pipersw where are de mosfets fans? and how change it? Desoldering and soldering news? Suppose....

It doesn't seem like a simple operation, if I tried ... I have many doubts. Is there any way to verify that mosfets really are the cause of the problem? it won't be, that I dare to change them, and then don't be ....

peirof

The stock fan fuse.... how many ampers have?

MrsDelish

from the gcode wiki:
M106: Fan On
Parameters

Pnnn Fan number (optional, defaults to 0)
Snnn Fan speed (0 to 255 or 0.0 to 1.0))

Your Macro turn the fan to a very low PWM duty cycle ( M106 P0 S1; Power On Fan )
Notice S1, that will be 1 in the 0 to 255 range, you need a 1.0 to use the 0.0 to 1.0 range.
Either try:

M106 P0 S1.0
or
M106 P0 S255
for full speed.

Your multimeter probably reports peak volt, you can verify with a little capacitor in series with your probe to even out the pwm signal, if you do not have a oscilloscope. (with S1 you probably get a low volt value with the capacitor in series).

peirof

Hi,

FAN0 and FAN1 do not work... But I have noticed strange behavior:

01 - Connet 3 fans to 3 Duet 2 fans shockets.
02 - For testing pourposes, i have do this macro:

M106 P0 S0 H-1; Heatskin
M106 P1 S0 H-1; Layer 02
M106 P2 S0 H-1; Layer 01


M106 P0 S1; Power On Fan
M106 P1 S1; Power On Fan
M106 P2 S1; Power On Fan

03 - In this moment... only FAN1 start to turn
04 - Mesure voltages in Duet fan shockets, images inluded in early post:

FAN0 - 20.92
FAN1 - 24.21
FAN2 - 7.99

Only Fan that turns, FAN1 -->24.21

05 - How i have configured fans, as layers fans, with DWC can reduce speed of the fan.... if under fan01 speed to 50%, the fan keeps turning, but the voltage in the shocket drops depending on the percentage that I select in DWC .... Lowering even from 20.92 and 7.99. FAN1 KEEPS TURNING I WILL BE THE VOLTAGE LOWER THAN THE OTHER SHOCKETS, FAN0 AND FAN2, THE FAN STILL ROTATING, SLOWER, CLEAR.

Why the fans conected to FAN0 and FAN2, they don't turn even slower ... if the voltage in shocket is 20.92 and 7.99???

droftarts

Like @MrsDelish said, set the fan speed to S255, so your macro should be:

M106 P0 S0 H-1; Heatskin
M106 P1 S0 H-1; Layer 02
M106 P2 S0 H-1; Layer 01

M106 P0 S255; Power On Fan
M106 P1 S255; Power On Fan
M106 P2 S255; Power On Fan

Are the three fans exactly the same? If they are different, they respond differently to the low PWM duty cycle.

Ian

peirof

The fans there isn't the same 2 heatskin fans 30mm 24v and 2 laywe fans 40mm 24v, but I have try to connect the fans in different sockets