Hello I am trying to make these drivers to work, but I have my PSU by default, I have just arise an Issue in github\MARLIN so that the M122 command does not work if the psu is off (I have the protectors on so no problem with EM issues) I have 2 psu on my printer, one small that turns on with the printer and feeds the RAMPS and arduino ,and other 12V PSU which turns on when MARLIN sends M80 GCODE. The question is : HAs someone come up with an idea to deal with these drivers without the 12v psu on...a jumper, a diode, more cabling? I hope you understand what I am requesting!! Let me know if you need more information. Thank you all. https://reprap.org/forum/read.php?219,848833,848833#msg-848833 Sun, 09 Aug 2026 01:14:38 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,848833,848956#msg-848956 https://reprap.org/forum/read.php?219,848833,848956#msg-848956
you can use an ATX computer power supply to do both. search here on reprap.org for it. +5VFSB to power the mega/ramps and then trigger the PS_ON

you can trigger a relay via one of the unused pins, either digital or analog to control power. i think you would do this on the 12V side.]]> sinned RAMPS Electronics Tue, 12 Mar 2019 02:49:14 -0400 https://reprap.org/forum/read.php?219,848833,848946#msg-848946 https://reprap.org/forum/read.php?219,848833,848946#msg-848946
I sent a question to GITHUB\MARLIN in order to make some change,on this.

Thank you.]]> Amachete RAMPS Electronics Mon, 11 Mar 2019 18:54:35 -0400 https://reprap.org/forum/read.php?219,848833,848836#msg-848836 https://reprap.org/forum/read.php?219,848833,848836#msg-848836
So basically M112 is not possible until it has Vmot power]]> Dust RAMPS Electronics Sat, 09 Mar 2019 04:10:04 -0500 https://reprap.org/forum/read.php?219,848833,848833#msg-848833 https://reprap.org/forum/read.php?219,848833,848833#msg-848833
I am trying to make these drivers to work, but I have my PSU by default, I have just arise an Issue in github\MARLIN so that the M122 command does not work if the psu is off (I have the protectors on so no problem with EM issues)

I have 2 psu on my printer, one small that turns on with the printer and feeds the RAMPS and arduino ,and other 12V PSU which turns on when MARLIN sends M80 GCODE.

The question is :

HAs someone come up with an idea to deal with these drivers without the 12v psu on...a jumper, a diode, more cabling?

I hope you understand what I am requesting!!

Let me know if you need more information.

Thank you all.]]> Amachete RAMPS Electronics Sat, 09 Mar 2019 03:49:11 -0500