Multiple fan connections Hello, I am just getting started with 3d printing & have been getting my materials & parts all lined out for a printer. I have the Sainsmart mega 2560 R3 with the ramps 1.4 with the A4988 drivers & the 12864 LCD. The question that I have is if I have one fan running to keep my ramps cool upon start up connected to the D9 terminals on the ramps where do I hook up another fan that I can control through the ramps or time delay for the hot end?. I've looked at the schematics and all over the webb & can't find any refrence for them. And yes with a handle like FarmerChuck i'm an old fart just getting started in 3D printing so either pin numbers or laymen terms, or a link to any article - page would be greatly appreciated. Thanks https://reprap.org/forum/read.php?219,449277,449277#msg-449277 Thu, 14 May 2026 22:17:27 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,449277,451417#msg-451417 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,451417#msg-451417 here.]]> jbernardis RAMPS Electronics Mon, 05 Jan 2015 23:55:46 -0500 https://reprap.org/forum/read.php?219,449277,451382#msg-451382 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,451382#msg-451382 09zx-6r RAMPS Electronics Mon, 05 Jan 2015 19:36:10 -0500 https://reprap.org/forum/read.php?219,449277,450628#msg-450628 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,450628#msg-450628 jbernardis RAMPS Electronics Sat, 03 Jan 2015 20:25:44 -0500 https://reprap.org/forum/read.php?219,449277,450331#msg-450331 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,450331#msg-450331
Those 2 pins are directly connected to the ramps grnd and 12v supply. Theres no logic applied to them.
If youve got 12v supply connected the pin will be at 12v.

Gordon]]> gordonendersby RAMPS Electronics Sat, 03 Jan 2015 06:54:25 -0500 https://reprap.org/forum/read.php?219,449277,450287#msg-450287 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,450287#msg-450287 09zx-6r RAMPS Electronics Sat, 03 Jan 2015 04:19:32 -0500 https://reprap.org/forum/read.php?219,449277,450077#msg-450077 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,450077#msg-450077 FarmerChuck RAMPS Electronics Fri, 02 Jan 2015 10:28:37 -0500 https://reprap.org/forum/read.php?219,449277,449360#msg-449360 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,449360#msg-449360 with or without a switch to power fans, lights or webcams as needed.

Gordon]]> gordonendersby RAMPS Electronics Wed, 31 Dec 2014 07:00:16 -0500 https://reprap.org/forum/read.php?219,449277,449300#msg-449300 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,449300#msg-449300 jbernardis RAMPS Electronics Wed, 31 Dec 2014 01:02:39 -0500 https://reprap.org/forum/read.php?219,449277,449295#msg-449295 Re: Multiple fan connections https://reprap.org/forum/read.php?219,449277,449295#msg-449295
Quote
FarmerChuck
Hello, I am just getting started with 3d printing & have been getting my materials & parts all lined out for a printer. I have the Sainsmart mega 2560 R3 with the ramps 1.4 with the A4988 drivers & the 12864 LCD. The question that I have is if I have one fan running to keep my ramps cool upon start up connected to the D9 terminals on the ramps where do I hook up another fan that I can control through the ramps or time delay for the hot end?. I've looked at the schematics and all over the webb & can't find any refrence for them. And yes with a handle like FarmerChuck i'm an old fart just getting started in 3D printing so either pin numbers or laymen terms, or a link to any article - page would be greatly appreciated. Thanks

I use D9 for the controlled fan via slicer settings or M106 & M107 codes and for the always on fan use 12v off the RAMPS. Look for either 2 pins or 2 "through holes" on the board between where the X driver plugs in and the diode next to the smaller of the 2 square yellow fuses - that should be 12v.

Steve]]> SteveRoy RAMPS Electronics Wed, 31 Dec 2014 00:33:22 -0500 https://reprap.org/forum/read.php?219,449277,449277#msg-449277 Multiple fan connections https://reprap.org/forum/read.php?219,449277,449277#msg-449277 FarmerChuck RAMPS Electronics Tue, 30 Dec 2014 21:38:43 -0500