Hi, I am using following in my 3D printer. Arduino MEGA2560, RAMPS 1.4, ATX PSU, Marlin firmware, 300x300 heatbed. Yesterday when I started the printer, I felt something burnt & that was the PSU connector which is connected to RAMPS. What could be the reason for this? Anybody had such issue?? I am using large heatbed without any relay. Is any relay necessary to fetch correct Amperes for large heatbed? Regardss, Prashant. https://reprap.org/forum/read.php?4,416891,416891#msg-416891 Wed, 12 Aug 2026 10:53:20 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?4,416891,451985#msg-451985 https://reprap.org/forum/read.php?4,416891,451985#msg-451985 prashantdshinde Reprappers Wed, 07 Jan 2015 06:02:10 -0500 https://reprap.org/forum/read.php?4,416891,423985#msg-423985 https://reprap.org/forum/read.php?4,416891,423985#msg-423985 zerodameaon Reprappers Fri, 24 Oct 2014 12:39:27 -0400 https://reprap.org/forum/read.php?4,416891,423450#msg-423450 https://reprap.org/forum/read.php?4,416891,423450#msg-423450
More details here : [reprap.org]]]> DeuxVis Reprappers Thu, 23 Oct 2014 08:41:02 -0400 https://reprap.org/forum/read.php?4,416891,423105#msg-423105 https://reprap.org/forum/read.php?4,416891,423105#msg-423105
I have assembled a seven switch 1.2.

Con1 is PSU +12v,

Con2 is.....? I don't understand what /where to connect this?

Heater is heatbed connector. But both pins of Heater connector shows 12v & 11v resp. Please clarify.

Please correct me if I am wrong.

If you can show me some images with all connections on ramps1.4 that would be very helpful

Regards,
Prashant]]> prashantdshinde Reprappers Wed, 22 Oct 2014 14:33:10 -0400 https://reprap.org/forum/read.php?4,416891,420459#msg-420459 https://reprap.org/forum/read.php?4,416891,420459#msg-420459
I cannot comment on whether your relay is suitable. It sounds as though it is if it has a 12v dc coil.
If it clicks it must be pulling in I think. Can I suggest you put a multimeter on it to check the output connections are correct and they are switching.

As Airkuld said, an electromagnetic relay is not ideal. You are better with a solid state relay. The one I use cost just 4.33 GBP.]]> dave3d Reprappers Thu, 16 Oct 2014 17:32:35 -0400 https://reprap.org/forum/read.php?4,416891,420082#msg-420082 https://reprap.org/forum/read.php?4,416891,420082#msg-420082
I made the relay circuit as per the image shown in - [www.makerfarm.com]

I hear the click sound when I turn ON the heatbed in Pronterface, But the heatbed is not getting heated.

Any suggestions please.....]]> prashantdshinde Reprappers Thu, 16 Oct 2014 02:29:20 -0400 https://reprap.org/forum/read.php?4,416891,419777#msg-419777 https://reprap.org/forum/read.php?4,416891,419777#msg-419777 airkuld Reprappers Wed, 15 Oct 2014 09:48:05 -0400 https://reprap.org/forum/read.php?4,416891,417509#msg-417509 https://reprap.org/forum/read.php?4,416891,417509#msg-417509 SevenSwitch is a design crafted with RepRap controllers and heated beds in mind. Easy to make and even buyable assembled.]]> Traumflug Reprappers Fri, 10 Oct 2014 05:23:02 -0400 https://reprap.org/forum/read.php?4,416891,417476#msg-417476 https://reprap.org/forum/read.php?4,416891,417476#msg-417476
Thanks for the info...

Mine relay is 6 Pin, DT90-1C-12VDC, (2 terminal for C, 2 for coil & 1 each for NO, NC)

NO : 30A 250VAC,

NC : 20A 250VAC

[doat.co.in]

It didn't specified much details but similar to [www.mouser.com]

Regards,
Prashant.]]> prashantdshinde Reprappers Fri, 10 Oct 2014 03:25:31 -0400 https://reprap.org/forum/read.php?4,416891,417309#msg-417309 https://reprap.org/forum/read.php?4,416891,417309#msg-417309
2 wires go fom the Ramps/Arduino bed connection output (D8) to the relay input so the relay switches on and off as required. I then wired a ground lead from the PSU direct to the bed and a +ve 12v supply from the PSU through to the output connectors on the relay to the +ve connection on the bed heater. Just pay attention to which one is +ve and which one is -ve. It is as simple as that.

The relay needs to be dc not ac. The spec on mine is:-

Fotek SSR-40DD
40 amp rating
5-32v dc input
5-110v dc output

I ordered it on Ebay from China. Got the idea from this forum.

[www.ebay.co.uk]

I mounted it on the back of one of the uprights on my OrdBot. Kept it close to the Ramps board to keep the wiring as short as possible. Works very well. Previously I used an ir gun and it was 150 deg C+, now cool enough to touch.]]> dave3d Reprappers Thu, 09 Oct 2014 12:44:37 -0400 https://reprap.org/forum/read.php?4,416891,417079#msg-417079 https://reprap.org/forum/read.php?4,416891,417079#msg-417079
I have one lying idle at this moment, but I don't know how to use it. (12 Volt PCB Mount Relay - 30 Amp)

That would be very kind of you...

Regards,
Prashant.]]> prashantdshinde Reprappers Thu, 09 Oct 2014 02:33:52 -0400 https://reprap.org/forum/read.php?4,416891,416975#msg-416975 https://reprap.org/forum/read.php?4,416891,416975#msg-416975 dave3d Reprappers Wed, 08 Oct 2014 16:29:34 -0400 https://reprap.org/forum/read.php?4,416891,416959#msg-416959 https://reprap.org/forum/read.php?4,416891,416959#msg-416959
I've since replaced my connectors with one that is rated up to 15 amps. I think I got them from mouser, but I don't have a link for you. It's not foolproof, but I'm hoping it's just a bit better. Also, it is VERY important that the wire be proper gauge (at least 20, perhaps even 18) and that you screw it down as tight as you can possibly make it.]]> jbernardis Reprappers Wed, 08 Oct 2014 15:53:14 -0400 https://reprap.org/forum/read.php?4,416891,416891#msg-416891 https://reprap.org/forum/read.php?4,416891,416891#msg-416891
I am using following in my 3D printer.
Arduino MEGA2560, RAMPS 1.4, ATX PSU, Marlin firmware, 300x300 heatbed.
Yesterday when I started the printer, I felt something burnt & that was the PSU connector which is connected to RAMPS.

What could be the reason for this?

Anybody had such issue??

I am using large heatbed without any relay. Is any relay necessary to fetch correct Amperes for large heatbed?

Regardss,
Prashant.]]> prashantdshinde Reprappers Wed, 08 Oct 2014 13:16:49 -0400