Anyone know why I wouldn't be able to turn 4-wire fans off?

dc42

@Adrian52 said in Anyone know why I wouldn't be able to turn 4-wire fans off?:

@dc42 Its a 60mm 4 wire noctua I use for manual extra cooling. The fans are configured:
M106 P0 S0 H-1                                      ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500                                ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45                                   ; set fan 1 value. Thermostatic control is turned on
M950 F2 C"!Fan2+^exp.pb6" Q25000
M106 P2 S0 H-1 C"Extra cool"
The 4 wire fan has black and yellow to an always on fan header, blue to fan2 -ve(PWM) and green to pb6 on the extension header(RPM).

Odd, I was sure that Noctua had told me that all their PWM fans went down to zero speed. My 40mm Noctua fan does. OTOH the Arctic F12 fans that I have don't turn off, they do down to about 30%.

Adrian52

@dc42 Sorry my noctua does go down to zero. My issue was that rpm only shows briefly then disappears, as mentioned by the op

Axel-H

@Adrian52 said in Anyone know why I wouldn't be able to turn 4-wire fans off?:

s that rpm only shows briefly then disappears, as mentioned by the op

I get this form M408 S2:

{"status":"I","coords":{"axesHomed":[0,0,0],"wpl":1,"xyz":[10.000,125.000,200.000],"machine":[10.000,125.000,200.000],"extr":[78948.0]},"speeds":{"requested":0.0,"top":0.0},"currentTool":-1,"params":{"atxPower":1,"fanPercent":[100,0,0,0,100,0],"speedFactor":100.0,"extrFactors":[100.0],"babystep":0.000},"sensors":{"probeValue":0,"fanRPM":[-1,-1,-1,-1,-1,-1]},"temps":{"chamber":{"current":22.9,"active":0.0,"state":0,"heater":0},"current":[22.9,22.7],"state":[0,1],"tools":{"active":[[210.0]],"standby":[[0.0]]},"extra":[]},"time":212261.0}

Still only "fanRPM":[-1,-1,-1,-1,-1,-1]

Version

Firmware: RepRapFirmware for Duet 3 MB6HC v0.6 or 1.0 3.0 (2020-01-03b3) ```

I would really appreciate being able to just cut the power (or the gnd return) for out4-out6 if that is possible, as I am a bit limited in what manufacturers fan I need to connect to them and I need sometime need them to be off.

Axel-H

I also get my edits flagged as spam all the time when I try to clean stuff upp

dc42

@Adrian52 said in Anyone know why I wouldn't be able to turn 4-wire fans off?:

@dc42 Sorry my noctua does go down to zero. My issue was that rpm only shows briefly then disappears, as mentioned by the op

I confirm that fault (RPM only showing briefly). I have just fixed it in the forthcoming 3.01-RC2.

Axel-H

Thank you.
Do it exist any way to get the RPM to show up in the new webcontroller GUI or are it hidden because it showed -1?

dc42

@Axel-H said in Anyone know why I wouldn't be able to turn 4-wire fans off?:

Thank you.
Do it exist any way to get the RPM to show up in the new webcontroller GUI or are it hidden because it showed -1?

It's hidden because RRF is reporting -1.

If you wish, you can try the internal RRF build at https://www.dropbox.com/sh/3azy1njy3ayjsbp/AACquxr2m00eV568RZg5QG5wa?dl=0 which includes the fix. There have been changes to some commands since 3.01-RC1, see https://github.com/dc42/RepRapFirmware/blob/v3-dev/WHATS_NEW_RRF3.md for details.

Axel-H

Thanks.

Any idea if it might be possible to shut down the power to/from the fan it they are form a maker that don't shut them down completely or if someone have to use the out and gnd pins of the 4 pin connections to control "regular" fans?

dc42

@Axel-H said in Anyone know why I wouldn't be able to turn 4-wire fans off?:

Thanks.

Any idea if it might be possible to shut down the power to/from the fan it they are form a maker that don't shut them down completely or if someone have to use the out and gnd pins of the 4 pin connections to control "regular" fans?

It would require 2 mosfets to control the fan, one to control the PWM signal and one to shut off the power. I guess you could use two fan outputs to do that, but then you would need two M106 commands to control the fan: one to turn it on and off, and one to control the speed. The simple option is to get a Noctua fan instead. Alternatively, see if it works in regular 2-wire PWM mode. If so, you can connect the tacho wire as well, but it will read correctly only when running at full speed.

Axel-H

Thank you for all the help.

Turning the fans off works as you said with noctua fans.

But turning of out4-out6 even when set to work as regular fans don't seem to work though.

Edit:
I thought I got some odd values on the tachometer as I use rather long cables but apparently noctuas 40mm fans are supposed to go at 5000 rpm