Skip to main content

Site Navigation

Your Account

Choose Language

Help

Revision to Connecting and configuring fans

David Crocker

== Overview ==
 
* The Duet 2 (WiFi an Ethernet) has three controlled fan connectors FAN0, FAN1 and FAN2 plus two always-on fan connectors. A jumper (V_FAN) allows you to select whether all fans are powered from the main (12/24V)VIN supply or from the Duet's 5V supply. FAN1 is on by default at power up, for maximum safety when you configure it as a thermostatically-controlled fan.
* The Duet 2 (WiFi an Ethernet) has three controlled fan connectors FAN0, FAN1 and FAN2 plus two always-on fan connectors. A jumper (V_FAN) allows you to select whether all fans are powered from the main (12/24V)VIN supply or from the Duet's 5V supply. FAN1 is on by default at power up, for maximum safety when you configure it as a thermostatically-controlled fan.
* Our intention is that in a 3D printer with a single print head, you use the''' Fan0 output for the print cooling fan''' and the '''Fan1 output for the heatsink fan'''. This is the easiest configuration to use because it's what the firmware expects by default.
* The Duex 2 and Duex 5 have 6 further PWM controllable fans (FAN3 - FAN8). ''(Versions before 0.8 had 5 fan connections see the [[Duex2 and Duex5 Features|Duex hardware page]]for details)''
 
[code]M106 P1 I1 ; invert PWM of fan 1[/code]
 
== Using 12V fans when VIN is 24V ==
 
If you need to use 12V fans buy tou VIN is 12V, if all your fans are 12V then on the Duet Wifi and Duet Ethernet you can do this:
 
* Remove the V_FAN jumper
* Connect the two input wires of a 24V to 12V common-negative step-down converter to an always-on fan output, taking care to get the polarity right
* Connect the +12V output of the converter to the centre pin of the V_FAN jumper block.
 
== Using a fan connector as a general purpose output ==

To undo the changes made by this version, click 'Revert Changes.' This will automatically restore the previous version of this guide.

Revert Changes