Controlling a 30amp 12v Power Supply I don't know if anyone will find this useful but its something I have done recently as I wanted my RAMPS to be able to turn off a 12v 30amp power supply when printing was finished. I haven't seen anything about how to do this about so I thought I would document my way. Below is a basic diagram of my solution. Its basically a solid state relay attached to the ps_on pin on the ramps but with a momentary push button across its terminals to bypass the solid state relay. Pressing this starts the power supply which then fires up the ramps. A fraction of a second later the RAMPS turns on the solid state relay which takes over supplying the power supply. The power supply remains on and under the control of the RAMPS and the whole system can be shut down with the M81 command. mod_embed_images_loadimage('2bd99cd0689048e54417c2dce66504ef', '/forum/thumbcache/0a2/e3e/b4c/5c0/c91/f21/355/219/37d/b52/53_800x400.png', 'http://forums.reprap.org/file.php?1,file=14970,filename=RAMPS-power-supply-control.jpg', 'https://reprap.org/forum/addon.php?1,module=embed_images,check_scaling=1,url=http%3A%2F%2Fforums.reprap.org%2Ffile.php%3F1%2Cfile%3D14970%2Cfilename%3DRAMPS-power-supply-control.jpg', '', 208688, 800, 400, 'Loading image ...', false); Feel free to ignore the ramblings of a mad man. https://reprap.org/forum/read.php?1,208688,208688#msg-208688 Thu, 21 May 2026 00:37:04 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,208688,208799#msg-208799 Re: Controlling a 30amp 12v Power Supply https://reprap.org/forum/read.php?1,208688,208799#msg-208799 misan General Wed, 15 May 2013 04:38:06 -0400 https://reprap.org/forum/read.php?1,208688,208741#msg-208741 Re: Controlling a 30amp 12v Power Supply https://reprap.org/forum/read.php?1,208688,208741#msg-208741 jamesdanielv General Tue, 14 May 2013 22:51:19 -0400 https://reprap.org/forum/read.php?1,208688,208693#msg-208693 Re: Controlling a 30amp 12v Power Supply https://reprap.org/forum/read.php?1,208688,208693#msg-208693 aduy General Tue, 14 May 2013 18:33:53 -0400 https://reprap.org/forum/read.php?1,208688,208688#msg-208688 Controlling a 30amp 12v Power Supply https://reprap.org/forum/read.php?1,208688,208688#msg-208688
Below is a basic diagram of my solution. Its basically a solid state relay attached to the ps_on pin on the ramps but with a momentary push button across its terminals to bypass the solid state relay. Pressing this starts the power supply which then fires up the ramps. A fraction of a second later the RAMPS turns on the solid state relay which takes over supplying the power supply. The power supply remains on and under the control of the RAMPS and the whole system can be shut down with the M81 command.



Feel free to ignore the ramblings of a mad man.
]]> lazzymonk General Tue, 14 May 2013 18:16:59 -0400