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How to connect heated bed to my ramps

Posted by SamuelB1002 
How to connect heated bed to my ramps
November 04, 2017 12:57AM
Hallo


Just bought a small 12 x 12 cm heated bed it is supossed to be a MK2b however when trying to find instruction I find another type.

Anyhow mine looks like this

[www.aliexpress.com]

II am not sure how to connect it. There are 5 wires

- HEAT; + 12 V ; SIG; 5V; GND


I presume -HEAT and + 12V are going to D8, and then SIG and GND need to go to the thermistor connection ?

Is that right or will I have another frying experience?

No need to connect the 5V ?







Samuel

Edited 1 time(s). Last edit at 11/04/2017 01:05AM by SamuelB1002.
Re: How to connect heated bed to my ramps
November 04, 2017 07:05AM
I've not see this board before, but looking at what we can see the 5v line is part on the on board thirmistor circuit. This would imply its meant to plug the sig line into a analog pin directly vs a pin with thirmistor circuitry on the main pcb (as found on most boards including ramp)


so "- HEAT; + 12 V" are the heating element for D8
Sig goes go a free Analog pin (I would use Aux-1, and use the A3, +5 and gnd pins for SIG; 5V; GND on this bed)

Then you need to update your firmware to use A3 for the heated bed thirmister pin. .

But this is a educated guess

Edited 2 time(s). Last edit at 11/04/2017 07:10AM by Dust.
Re: How to connect heated bed to my ramps
November 05, 2017 11:58AM
Hey

Got it connected and working

-heat and 12v for power

And

Gnd and Sig for themistor

were the correct paires.

Just one problem if i cranck it up to 100 degrees it go's very slow and around 80 degrees it gives an error and switches to dry run mode. So heat-up stops.

Checked the power supply its rated at 25 A should be OK.

Any tips to get this fixed.

Samuel
Re: How to connect heated bed to my ramps
November 05, 2017 04:15PM
It really needs some insulation under it

Cork is good, wool based felt works well.
Corrugated Cardboard works better than nothing.
Re: How to connect heated bed to my ramps
November 06, 2017 01:31PM
as Dust just said regarding cork +1 !!

I got sheets of it from a local dollar store... supposed to have been things you put hot cookware on....

cut it up, works ace 5mm thick for 2$ Canadian!
Re: How to connect heated bed to my ramps
December 08, 2017 04:18PM
I am having the same problem and brought the same heated bed with same specification.....

Can anyone post the pics of the heated bed and ramps connected for my reference ???

Anonymity

Edited 1 time(s). Last edit at 12/08/2017 04:18PM by Anonymity.
Re: How to connect heated bed to my ramps
December 13, 2017 08:14PM
Might want to verify the correct thermistor, must match setting in software. Which do you have?
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