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Revision to Connecting and configuring fans

Tony

* 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) 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 Duex2Duex 2 and Duex5Duex 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)''
* The Duex2Duex 2 and Duex5Duex 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)''
 
Older members of the Duet family have different provision for connecting fans:
== Always-on fans ==
 
The Duet 0.8.5 and Duet WiFi2 provide two connectors for fans that should be on any time the power is on. Many setup guides suggest this is how you should wire your hot end fan (but see thermostatic fans, below) to prevent heat from creeping back and melting the filament, jamming the hot end. You may also wish to attach a fan to move air across the underside of the Duet WiFi2, keeping the stepper drivers cool. Simply plug any such fan into one of these sockets, connecting the red wire to V_FAN and the black wire to GND.
The Duet 0.8.5 and Duet WiFi2 provide two connectors for fans that should be on any time the power is on. Many setup guides suggest this is how you should wire your hot end fan (but see thermostatic fans, below) to prevent heat from creeping back and melting the filament, jamming the hot end. You may also wish to attach a fan to move air across the underside of the Duet WiFi2, keeping the stepper drivers cool. Simply plug any such fan into one of these sockets, connecting the red wire to V_FAN and the black wire to GND.
 
If you want to run your other fans on a Duet WiFi2 from 5V but your always-on fans from 12/24V, you can wire them directly across the power supply pins and ignore the Duet's connectors.
If you want to run your other fans on a Duet WiFi2 from 5V but your always-on fans from 12/24V, you can wire them directly across the power supply pins and ignore the Duet's connectors.
 
== Thermostatically controlled fans ==
 
As mentioned above, many hot ends require a fan to keep the heatsink cool, so that the filament remains solid until it passes through the heat break into the melt zone. This fan should be on any time the hot end is hot enough to melt plastic, but can safely be off when the hot end is cool even if the rest of the machine is on. The Duet WiFi2 supports this mode of operation. Plug your fan into one of the PWM connectors, say FAN1, and configure it as a thermostatic fan for the appopriate heater by putting the appropriate M106 G-code in config.g. For example:
As mentioned above, many hot ends require a fan to keep the heatsink cool, so that the filament remains solid until it passes through the heat break into the melt zone. This fan should be on any time the hot end is hot enough to melt plastic, but can safely be off when the hot end is cool even if the rest of the machine is on. The Duet WiFi2 supports this mode of operation. Plug your fan into one of the PWM connectors, say FAN1, and configure it as a thermostatic fan for the appopriate heater by putting the appropriate M106 G-code in config.g. For example:
 
'''M106 P1 T45 H1'''
 
This sets fan 1 to run any time the temperature of heater 1 is above 45 Celsius. See [http://reprap.org/wiki/G-code#M106:_Fan_On] for details. We recommend you use the FAN1 connector for a thermostatically-controlled hot end fan, because on the Duet WiFi2 it defaults to being on at power up, to provide maximum safety if you restart your Duet when the hot end is hot.
This sets fan 1 to run any time the temperature of heater 1 is above 45 Celsius. See [http://reprap.org/wiki/G-code#M106:_Fan_On] for details. We recommend you use the FAN1 connector for a thermostatically-controlled hot end fan, because on the Duet WiFi2 it defaults to being on at power up, to provide maximum safety if you restart your Duet when the hot end is hot.
 
A thermostatically controlled hot end fan will be turned on automatically when you auto tune any heater that it monitors.

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