Wiring the fans

[mediaklan]

Hi everyone !
So, I'm building a prusa i3 with iduino mega R3+ramps 1.4 and I'm in the "wiring" section of the building instructions. But I can't figure out the need to connect the fans to the PSU. According to the wiki or the PDF, I'm supposed to get the wiring connect either to the PSU directly, or to the board power port.

But i'm confused, because in this picture (from the ramps 1.4 wiki), you can see a fan connected directly to the board, quite close to the X stepper driver.
Is there a way to connect both fans into the board somewhere ? Am I really supposed to connect the fans to the PSU or the board power port ?
Thank you all in advance for your help !

[zhangxueyou]

Yes, you can also connect the fan to that connector. But please connect the red wire to "+" and black to "-" plus, or the fan will be dead.

[mediaklan]

Thank you ! I've got the fans working.
Here's my wiring completed :

... and the PSU :

Only thing missing now might be the firmware.

[zhangxueyou]

No, you should mount the mainboard like the following pictures.The temperature of MOSFET will raise immediately when heating, it needs to be cooled down or it will be burnt out.

QQ截图20150420142356.png (667.06 KiB) Viewed 17017 times

QQ截图20150416160855.png (487.88 KiB) Viewed 17017 times

[mediaklan]

Agree, but don't worry zhangxueyou, I have 2x80mm fans right now carefully cooling down the mosfet right now (these fans are not connected on the board or the PSU, don't worry). And I'm planning to go for what Joseph have done in this other post we're both participating :
http://www.geeetech.com/forum/viewtopic ... #p23305Can you
And I've just realized my endstop wiring is incorrect (i think) in my picture. Just ignore it.
So now that my wiring is complete, what should I do now ?

[zhangxueyou]

Agree, but don't worry zhangxueyou, I have 2x80mm fans right now carefully cooling down the mosfet right now (these fans are not connected on the board or the PSU, don't worry). And I'm planning to go for what Joseph have done in this other post we're both participating :
http://www.geeetech.com/forum/viewtopic ... #p23305Can you
And I've just realized my endstop wiring is incorrect (i think) in my picture. Just ignore it.
So now that my wiring is complete, what should I do now ?

The last thing is leveling the hotbed. Let the distance between nozzle and hotbed about 2 piece of paper thick. I suggest you adjust it when printing, no gaps between the printing lines on first layer is the best.
Oh, before printing, you should also have a good slicer setting, what is your filament diameter and nozzle diameter? I can share with you.

[mediaklan]

Let the distance between nozzle and hotbed about 2 piece of paper thick. I suggest you adjust it when printing (...)

Good to know, but I can't do that right now since when I power up the printer, nothing working except for the fans.
Did it means I need something else ? Firmware maybe ?

[zhangxueyou]

Please check your email.

[mediaklan]

Thank you for your help zhangxueyou ! And thanks for the firmware. I'm using ramps 1.4+iduino Mega R3 with Linux so windows instructions can't really help me.
Anyway, I opened Arduino 1.0.5, loaded the I3_Ramps_ino.ino, checked it and upload it successfully. Thank you again zhangxueyou.
So now for some details :
Now, the LCD panel does work, but not very well (it is sometimes intermittently flashing a little bit). I get it to worked as I unplug and plug again the cables. I hope it's gonna stay that way ...
1 : as soon as the LCD light on, it's showing me "ERR: MAXTEMP BED".
2 : Still from the LCD panel, I can get the bed moving on his Y axis just fine, and I can get the extruder moving on his X axis fine too, but I can't find a way to move anything on the Z axis.
3 : Using repetierhost, I can't get anything to work, repetierhost won't even connect to the printer and show this :

Code: Select all

baud_base (115200) does not allow setting custom baud rate

[zhangxueyou]

1. The hot bed thermistor is short, please check is somewhere of thermistor wire is short. I think the first line of LCD must be displaying " 358/0".
2. Please check if the z endstop is connected correctly, and check if the 3 jumper caps under z motor driver have been plugged.
3. The Baud rate should be 250000.