E0/E1 Terminal pins are backwards on silkscreen for DuetWifi
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The silkscreen for the DuetWifi I downloaded shows E0/VIN backwards from what my board has. This normally would not matter but I use the E0 +12V output as a common to feed the two fans so they polarity matters. The VIN on both E0 and E1 are closer to the LED's and - are closer to the stepper connectors.
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Why not use the Onboard Fan Headers?
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Yes there is an error on the silkscreen, please use this as a reference: https://duet3d.com/wiki/Duet_WiFi_wiring_diagrams
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But as Doug said, why do you want to connect fans to the heater terminals?
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But as Doug said, why do you want to connect fans to the heater terminals?
Doing so reduces the total number of wires required between controller and extruder. Mendel90 is a good example: To fit an E3DV6 hotend with its active cooling fan, without running any extra wires (ribbon cable, remember) requires using a common 12V for heater and fan, while still making use of (independent) switched grounds for both those circuits.
Page 67 of the Mendel90 build manual shows only the (switched) ground connected to the Melzi controller board:
https://github.com/nophead/Mendel90/blob/master/dibond/manual/Mendel90_Dibond.pdf -
Yes this is fine for the shared VIN. Just be careful with grounds especially with thermistor ground as that is on a seperate circuit.