Heater VIN for Part Fan or how to assign Fan 2 to Tool 0

Jorge

Hi guys,

I am new to the Duet Wifi and try to run a CoreXY with it. The printer is already running but I have some issues and need some help. The first thing is the part fan.

In order to reduce the wires to the hotend, I connected the part fan to VIN of the heating cartridge. Then I connected the - wire of the fan to FAN0-. But it does not work when I set FAN 0 to 100% in the web interface. V_FAN is set to VIN by jumper. I assume VIN is not equal to VFAN though? Is there a schematic available?
But when I connect the fan to FAN2- it works and I can set Fan 2 in the web interface.
Sending M106 P2 S255 works as well.
But my slicer only generates M106 S255. I can`t make it export the "P2".
So I tried to assign fan 2 to tool 0 by sending: M563 P0 F2 or M563 P0 F0:2
No Success.

Hope I could make my problem clear and that someone can explain either:
Why works only Fan 2 while I connect Fan+ to VIN of the heater?
or
How to make Fan 2 react on M106 S255?

Veti

please post your entire config

deckingman

@jorge What is the voltage of your power supply, and what is the voltage of the fan you are trying to use? Also, have you seen this https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans?

Jorge

Here is my config:
0_1555923956089_config.g

My power supply has 24V and the fan as well.
I have read the article. Thats where I found the M563 command. But I must misunderstand something.

Veti

for the fans to be controlled by m106 you have to turn off Thermostatic control.
you also dont have a config for fan 2.
see the configurator. https://configurator.reprapfirmware.org/Start

also max speed of 90000 is a bit high.

deckingman

@jorge

To get a fan to work as a part cooling fan, and as @Veti said, you need to turn off thermostactic mode by using H-1.

So for fan 0, you need to use something like M106 P0 S0 I0 H-1 and likewise if you want to use fan 2, then M106 P2 S0 I0 H-1. The simplest thing would be to use fan 0, then you don't need to map a different fan to a tool.

dc42

@Jorge, for schematics see https://github.com/T3P3/Duet.

Fan 1 on the Duet WiFi/Ethernet is set up as a thermostatic hot end fan by default, so to use it as a part cooling fan you need to disable thermostatic mode as @deckingman says. Fans 0 and 2 should be controllable by default. So maybe there is something wrong with your Fan0 output.

You can map the part cooling fan to particular fans using the F parameter of your M563 tool definition commands. For example, if your M563 P0 command includes parameter F2 then any M106 command without a P parameter will be routed to Fan2 when tool 0 is active.

deckingman

@dc42 said in Heater VIN for Part Fan or how to assign Fan 2 to Tool 0:

.................Fans 0 and 2 should be controllable by default. So maybe there is something wrong with your Fan0 output.

David. If you take a gander at the config.g that the OP posted, you'll see that he had set Fan 0 set to be thermostatic. So there may well be nothing wrong with the output.

dc42

@deckingman said in Heater VIN for Part Fan or how to assign Fan 2 to Tool 0:

@dc42 said in Heater VIN for Part Fan or how to assign Fan 2 to Tool 0:

.................Fans 0 and 2 should be controllable by default. So maybe there is something wrong with your Fan0 output.

David. If you take a gander at the config.g that the OP posted, you'll see that he had set Fan 0 set to be thermostatic. So there may well be nothing wrong with the output.

Good point:

M106 P0 S0 I0 F500 H T45 ; Set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned on

H with no number after it will be interpreted as H0.

Jorge

Thank you guys! I have a long print running, so I can't test it now, but it sounds like you found the reason for Fan 0 not to work.
Is the thermostatic function a modifiable setting in the online configurator? Or can I change this only manually?

And I still don't understand, why I can't run Fan 2 by sending this:
M563 P0 F2
M106 S255

Is this not what @dc42 said?

But sending this works:
M106 P2 S255

And setting Fan 2 in the web interface works as well.

Veti

on the last page of the configurator for the fans (where you can add Fan2) there is a button for Thermostatic Control

Jorge

Ahh how could I not see!? So it really was a noob problem. Now it works. Thank you so much!