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Revision to Connecting and configuring fans

Manuel Coenen

== Using 12V fans when VIN is 24V ==
 
If you need to use 12V fans but your VIN``VIN`` is 24V and all your fans are 12V, then on the Duet Wifi and Duet Ethernet you can do thishave the following options using a buck-down converter:
If you need to use 12V fans but your VIN``VIN`` is 24V and all your fans are 12V, then on the Duet Wifi and Duet Ethernet you can do thishave the following options using a buck-down converter:
 
* Remove# Wire the V_FAN jumper
* Connect
buck regulator input directly to the two``VIN`` terminals, and the output to the centre pin of ``V_FAN``^^1^^
# Wire the buck regulator positive
input wiresto the ``VIN`` end of a 24V``V_FAN``, the output to 12V common-negative step-down converterthe centre pin of ``V_FAN``, and ground to any power ground connection (possibly the ground side of an always-on fan output, taking care to getoutput)^^2^^
# Put a jumper on ``V_FAN`` at
the polarity right
* Connect
``VIN`` end. Wire the +12V outputbuck regulator input to an always-on fan output. Wire the positive wires of 12V fans directly to the converterbuck regulator output, and the negative wires to the centre pin``FAN-`` pins of the V_FAN jumper block.controlled fan outputs as usual^^3^^

==== Notes ====

^^1^^ all the fans must be 12V and there is no fuse protection

^^2^^ all the fans must be 12V and the input of the buck regulator is protected by the 1A fuse

^^3^^ the connection of a 12V fan is more complicated, but you can use 24V fans as well. The buck regulator input is fuse protected
* Remove# Wire the V_FAN jumper
* Connect
buck regulator input directly to the two``VIN`` terminals, and the output to the centre pin of ``V_FAN``^^1^^
# Wire the buck regulator positive
input wiresto the ``VIN`` end of a 24V``V_FAN``, the output to 12V common-negative step-down converterthe centre pin of ``V_FAN``, and ground to any power ground connection (possibly the ground side of an always-on fan output, taking care to getoutput)^^2^^
# Put a jumper on ``V_FAN`` at
the polarity right
* Connect
``VIN`` end. Wire the +12V outputbuck regulator input to an always-on fan output. Wire the positive wires of 12V fans directly to the converterbuck regulator output, and the negative wires to the centre pin``FAN-`` pins of the V_FAN jumper block.controlled fan outputs as usual^^3^^

==== Notes ====

^^1^^ all the fans must be 12V and there is no fuse protection

^^2^^ all the fans must be 12V and the input of the buck regulator is protected by the 1A fuse

^^3^^ the connection of a 12V fan is more complicated, but you can use 24V fans as well. The buck regulator input is fuse protected
 
== Using a fan connector as a general purpose output ==

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