24V Duet with 12V Duex Fans not working

Deltasquare

So I fixed up my printer with an ew Duet2 WiFi and a Duex5. Fans on the Duet2 work fine. Everything as it should.
Unfortunately the 12V Fan pins (set by jumper) do not produce any usable Voltage.

However when attaching the voltmeter to the fan output and activating the relative fan-port I observe that the trickle voltage of a few mV disappears and goes to zero. When deactivating the port again, the trickle charge comes back.

I have tried it a number of times, and have written a script to make sure I dont muck something up just because of typos of something:

M106 P0 S1 I1
G4 P2000

M106 P0 S1 I0
G4 P2000

M106 P0 S0 I1
G4 P2000

M106 P0 S0 I0
G4 P2000

M117 Test Fan0 complete
;------------

M106 P1 S1 I1
G4 P2000

M106 P1 S1 I0
G4 P2000

M106 P1 S0 I1
G4 P2000

M106 P1 S0 I0
G4 P2000

M117 Test Fan1 complete
;------------

M106 P2 S1 I1
G4 P2000

M106 P2 S1 I0
G4 P2000

M106 P2 S0 I1
G4 P2000

M106 P2 S0 I0
G4 P2000

M117 Test Fan2 complete
;------------
M106 P3 S1 I1
G4 P2000

M106 P3 S1 I0
G4 P2000

M106 P3 S0 I1
G4 P2000

M106 P3 S0 I0
G4 P2000

M117 Test Fan3 complete
;------------
M106 P4 S1 I1
G4 P2000

M106 P4 S1 I0
G4 P2000

M106 P4 S0 I1
G4 P2000

M106 P4 S0 I0
G4 P2000

M117 Test Fan4 complete
;------------
M106 P5 S1 I1
G4 P2000

M106 P5 S1 I0
G4 P2000

M106 P5 S0 I1
G4 P2000

M106 P5 S0 I0
G4 P2000

M117 Test Fan5 complete
;------------
M106 P6 S1 I1
G4 P2000

M106 P6 S1 I0
G4 P2000

M106 P6 S0 I1
G4 P2000

M106 P6 S0 I0
G4 P2000

M117 Test Fan6 complete
;------------
M106 P7 S1 I1
G4 P2000

M106 P7 S1 I0
G4 P2000

M106 P7 S0 I1
G4 P2000

M106 P7 S0 I0
G4 P2000

M117 Test Fan7 complete
;------------
M106 P8 S1 I1
G4 P2000

M106 P8 S1 I0
G4 P2000

M106 P8 S0 I1
G4 P2000

M106 P8 S0 I0
G4 P2000

M117 Test Fan8 complete
;------------

dc42

Is the 12V_EN jumper fitted on the DueX?

When you send M115, does the response mention the DueX?

Deltasquare

M115
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.03 ELECTRONICS: Duet WiFi 1.02 or later + DueX5 FIRMWARE_DATE: 2019-06-13b2

alt text

Deltasquare

FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 2.05 ELECTRONICS: Duet WiFi 1.02 or later + DueX5 FIRMWARE_DATE: 2019-12-13b1

Updated Firmware, still nothing.

While I was at it, I just replaced the Jumper to its previous (VIN) position: I get a 24V output! So something in there is alive. It just does not work with the jumper set to 12V. Unfortunately I have not tried this with the previous software package.

So its just the 12V output that is not working.

Is this a user error (2 jumpers necessary or something else), or is the integrated stepdown not working?

Deltasquare

So it was a user fault after all!

I failed to set the 12V_EN which is the jumper to enable the 12V output on the Duex. But to be frank, I did not find that information anywhere reasonable. @dc42 Can you please input that info into the guides? I do not find it there.

So one has to set the 12V voltage selection jumper (green) AS WELL AS the 12V_EN 12V enabling jumper (yellow) ...

alt text

dc42

It's already mentioned at https://duet3d.dozuki.com/Wiki/Duex_wiring_diagrams#Section_Warnings_and_Cautions.