FAN controlled by RRD Fan Extender

skysurfer

i have bought the TMC2130 drivers and tl-smoother.

When i reache it i wil rebuild the drivers and then we wil see what is comming out with the noices.

Noices about the Y-axis the the other thread.

skysurfer

Samuel,

do you know if the extruder fan is connected to the 12 / 24V output directly on board?
The background is, I could measure it, but it is not so easy due to the structure of the printer and I like also operate this fan via the RRD Fan Extender.
A 12V fan 30x30, matching the RRD Fan Extender is ordered.

skysurfer

Hi Samuel,

i have found the power for the extruder Fan.

It must be the pin named 24/12V on the board, because the components fan (controlled by PWM) is connected

to D9.

So i hoppe i can reach my goal too make the extruder fan controllable from Marlin over the RRD Fan Extender.

For this i must replace the 30x30x10 24V fan with an 30x30x10 12V Fan.

The fan i reached this week.

Samuel Pinches

Thanks for the nice annotated photo. I don’t think there is any 12V on the A5, it is all 5V or 24V. Fans are all 24V.

skysurfer

Thats true Samuel, in the standard variation there are 24V fan's in.

I have wrote that i build an RRD fan extender in, to control the fan for the driver.

This RRD have his own power conection and it be can use only with max. 20V

And so the 24V from the power box is too much.

This is the reason why i used an StepDown from 24V to 12V and an 12V fan for

the driver cooling.

The RRD can control two fan's over Marlin about the pin 11 and 6.

So i like to control the extruder fan also with the RRD and for this i must change the
standard fan from 24V to 12V.

And on this way, i have a silent printer and save power when the printer is only powered on and not on printing.

Marlin powered bouth fan's on when a print jop wil started and powered off, when the
motors are inaktiv and no extrution is runing.

I have found also, that the 5V fan's and the 24V standard fan for extruder bring's not so much

air performance as the 12V fan's which i have bought for testing.

And when you now say, more air performance for the extruder can be dangeres, then i give you the
answer, yes it can be, but never know's realy, so i make the tests and will see and with RRD the fan on pin 11 can controlled also over the speed.

skysurfer

the goal is reached

Both fan's, the fan for driver cooling and the fan for the extruder coldend are controlled now by Marlin and it runs perfect.

I have changed the coldend fan from 24V to 12V, because the fan for the driver runs also with 12V over the StepDown from 24V to 12V.

The reason is, that the RRD FAN Extender can not controll more as 20V.

Many thanks Samuel, for your support.

Samuel Pinches

Thanks - nice job @skysurfer