3wire fans on 1LC

[PaulHew]

So as well as upgrading from a Duet2 eth +Duex 5 to Duet3 Mini + 1LC, I had to replace my 24v fans with 12v ones and thought I would get the 3 wire fans as they were out of stock of 2.

My part cooling fan is a Delta bfb0512hh-f00 . red, black and a blue wire.
I have looked for the past day trying to understand how to wire them in.

Read this countless times.

Red (or yellow, if there is no red wire) and black wires: connect them to the + and - pins respectively of an always-on fan connector.

Blue wire (PWM control): connect it to the FAN- pin of your chosen controlled fan connector.

So I presume I have the wrong fan and cannot read the speed of the fan, needs to be a 4 wire?
If so, is the following correct? Do not fancy blowing up a new board(s)

Wiring the part cooling fan to the 1LC into Out1, Is this correct?
Red wire goes to "out1. 12v"
Black to out1.Gnd
Blue to out1.out1

And the Tool cooling fan
Red to out2.12v
Black and Blue to out2.out2
Its a 2 wire!

Thanks in advance.
Feel like a newbie again and I only changed a board or 2!

Regards,
Paul.

[oliof]

@PaulHew i have wired up a 3 wire noctua fan where the third wire reports RPM to the 1LC. That machine is currently down for mechanical maintenance, but the fan definition is

M950 F1 C"10.out2+out2.tach" Q5000                 ; create fan 1 on pin out2 and set its frequency, and tacho output on out2.tach
M106 P1 S1 H1 T45                                     ; set fan 1 value. Thermostatic control is turned on

I hope that helps.

Best,
Harald

[dc42]

@PaulHew said in 3wire fans on 1LC:

Wiring the part cooling fan to the 1LC into Out1, Is this correct?
Red wire goes to "out1. 12v"
Black to out1.Gnd
Blue to out1.out1

No. For a 3-wire fan it should be:

Red -> out1_12V+
Black -> out1_neg
Blue -> out1_tacho

The tacho will only read correctly when the fan is running at full PWM.