setup fans on the 3hc

wbrokow1

I have the tom sanladerer setup with a 6hc & 3hc. There are 2 fans for cooling the electronics bay. how can I set them up if I have them both plugged into the 3hc?

I found this on the doc site:

; 2-wire fans, normally controlled and thermostatic
M950 F0 C"out3" Q500 ; create fan 0 on pin out3 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off

droftarts

@wbrokow1 What CAN address is the 3HC? Once set, you add the CAN address of the 3HC to the pin name. Eg, if the CAN address is 1, add C"1.out3".

Ian

wbrokow1

@droftarts ok. i'll try that, thanks

wbrokow1

@droftarts one more stupid question: which is the + wire connection on the 2 wire fan output. I don't understand the "key"
Thanks

droftarts

@wbrokow1 See the 3HC wiring diagram here: https://docs.duet3d.com/Duet3D_hardware/Duet_3_family/Duet_3_Expansion_3HC#wiring-diagram
Assuming you're using OUT3:

Connect a two-wire fan with red to V_OUTLC1 (this is voltage output, actual voltage is selected by the three pin jumper above OUT3) and black to out3.

Ian

wbrokow1

@droftarts yay! that worked. I am really getting to like duet 3d and reprap firmware. let's label + and - from now on! lol