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Revision to Connecting and configuring fans

David Crocker

* 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'''.
* The Duex2 and Duex5 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)''

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