How do I implement HBP (Heated Bead Platform) on Mbot-Cube?

[Ruben Hernandez]

Recently I bought the MK2a PCB heatbead and was wondering if anyone has tried to implement the HBP to the Mbot3d Cube, all of the required connections are there, but I need further assistance in figuring out how to connect the MK2a to the HBP-THERM diagrams and pics would help or other suggestions. Thanks in advanced.

[René Hartnick]

Hi, i have also a heated bed MK2a. Do you installed it?

[Andrew Natale]

I am still trying to solve this..

I have a 24V bed hooked up and a 100k thermistor plugged into the HBP-THERM, yet I am getting readings of 120C at room temperature..

Did you end up getting it installed?

[Phil Wheat]

I've been working on this myself, the issue I've run into is that the power supply seems to not be able to handle a Mk2a.  I've sourced another power supply (350W) but it's only 24V and I'm wiring up a voltage regulator to also give the 5V needed to run the board.  (My objective is to not need two power supplies.)

That being said, while I was gathering all the parts for the upgrade, I've been using a simple glass plate over an aluminum, 3 point plate and with some Kapton, ABS has been printing very well.  I'll post some pictures later today on my setup - it was really inexpensive for what I've got now.  Basically $4 for some float glass, $15 for the aluminum build plate (and I could have done that cheaper) and $2 for some #6 screws and wing nuts.

[Rushey99]

I'm stuck on how to get a 100K NTC Thermistor to give a reading of room temp. It gives me a reading of 110C at 25C, and if I use a 440K resistor instead I get a reading of 60C. It would appear that I need a thermistor to give a resistance of 10M Ohms before i get a reading of 25C. Is this a problem with the comparison table in the firmware or am I missing something fundamental with the wiring when I connect using the two pins 4 & 3 on the HBP therm.

[FrogKing]

Hi Ruben:

u need a cable which can fit the end of heated board, same as another end, it have to fix the motherboard too. 

sorry I do not have the sample , cause it really difficult to find. 

sincerely  

在 2013年4月1日星期一UTC+8上午1时53分56秒，Ruben Hernandez写道：

[casey chambers]

Did you find any solutions?  i have a mk2 24v but my thermistor gives the wrong temperature.

[Andrew Natale]

It's been 6 months for me and I still haven't found a solution, I've updated the firmware using cables, got stronger resistors, everything... The heated bed thermistor is still being read incorrectly by the mbot cube. Huge let down.

[ian.b...@stackflo.com]

You will need a 4.7k Resister, 10uf Capacitor, 24v 10A relay , 100k thermistor ( I assume you got a thermistor with the MK2a). I will upload a diagram soon.....

[ian.b...@stackflo.com]

You will need a 4.7k Resister, 10uf Capacitor, 24v 10A relay , 100k thermistor (not sure if brand matters, the one I got with my HBP was fine, I may have to look up what it was).

I have attached a diagram. Relay is to protect the Mightyboard because apparently it cant take the load of the HBP and will eventually fail.

Note also the power supply that came with the MBot is not big enough for the HBP.

There are software settings also.

On Monday, April 1, 2013 6:53:56 AM UTC+13, Ruben Hernandez wrote:

[Raphael Diaz]

I just wanted to confirm that this method of adding a HBP to an MBOT was a success. i created a cable harness using the 10uf capacitor and a 4.7k ohm resistor and plenty of shrink tubing to insulate the components. i also used the relay as described and everything is working fine. i am reading pretty much the same temperature with an infrared thermometer as the machine is indicating. 

[Milton Quranda]

My MBot does not output any voltage from the HB connectors. I tried the above wiring but its not working. The preheat setting also shows Heated Bed as NA. Any idea what could be wrong?

[Andrew Moore]

My MBot does not output any voltage from the HB connectors. I tried the above wiring but its not working. The preheat setting also shows Heated Bed as NA. Any idea what could be wrong?

If the thermistor wiring is incorrect it will not work as expected. Ensure the capacitor is installed correctly and the resistor is of an appropriate value. If the resistance is too low (<1k) you might see this.

Also, have you enabled the heated bed in the firmware?

Cheers

[Milton Quranda]

Yes i have enabled the heated bed in the firmware.. My firmware is still the original version (Not sure if the firmware version could be a problem). Did not get to update since i use a Mac and no access to windows machine. 

The resister is 4.7k and a 35v 10uf capacitor is connected. the positive wire is on pin 4 while the negative is on pin 1 and the resister wire on pin 2. no wires to pin 3 as per the diagram.

[Andrew Moore]

Yes i have enabled the heated bed in the firmware.. My firmware is still the original version (Not sure if the firmware version could be a problem).

Shouldn't be a problem.

 

Did not get to update since i use a Mac and no access to windows machine.

Not sure what the issue is here? You can do everything you need to do on a Mac.

If you received your printer after July last year you should be able to update the firmware using the ReplicatorG software. If you have an earlier printer you'll need an AVR programmer to update the firmware.

 

 The resister is 4.7k and a 35v 10uf capacitor is connected. the positive wire is on pin 4 while the negative is on pin 1 and the resister wire on pin 2. no wires to pin 3 as per the diagram.

Double check your connections.

Test your thermistor with a multimeter. Dunk it into ice or boiling water and watch the resistance change.

Check your connections again.

How are you connecting to the pins on the board? Ideally you should use some kind of connector. Soldering directly to the pins can be problematic if you're not careful.

Cheers 

[Milton Quranda]

So I got the heated bed working. The problem was either i had a wrong capacitor or the wrong resister. The resister i had was the same color band but a size smaller then the one i have currently attached. And the Capacitor i was using was a cylinder one which i changed to the button type one http://goo.gl/wE5wQa

Now the printer detects the thermistor and temperature. A new issue though. 

When i connect the relay to the fan voltage output, i get 24v from there and the relay completes the connection and my HB is heating up. But when i connect the relay to the HB output terminals the relay led lights up but does not complete the connection. I checked the voltage and its 24v from the HB output. I don't understand why the relay does not complete the connection. I went back and forth with the fan output and HB output it definitely works from the fan output and not the HB output. I am guessing the HB output is not giving enough amps for the relay to work? 

Any other guesses?

-Milton

[3Dbot]

This is my heat bed, can any one help to wired it to main board.

Is this heat bed need external 24V power supply? 

[Milton Quranda]

Here's what i think the pinout would be. 

[Milton Quranda]

Finally got it working. Took a long time but got it working. In the process, I even exploded a glass place cause it got over heated. Here are the materials i used:

Helios Heated Bed: http://www.amazon.com/Helios-Heatbed-RepRap-Mendel-Printers/dp/B00ITJ8ECK

40A 24V Relay: http://www.amazon.com/gp/product/B00E1JMVXA/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1

BLUE and WHITE wires go to the Heated Bed points on the mother board, RED goes to the 24V power supply, BLACK goes to + on the Helios heated bed. Negative cable directly from power supply to Helios heated bed. 

15A 24V 360W Power supply: http://www.amazon.com/gp/product/B007F7S4P4/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

12mm x 10mm x 0.249mm Aluminum Sheet for platform. You can get a custom cut from onlinemetals.com for about $26

Remaining harness as stated in the picture in this forum.

I'll post a picture once i have got some prints.

[Juan Pablo Muñoz Bravo]

Dear Milton, i have been looking at this, how actully did you manage to connect the HBP to the mbot? did you connect it to the mainboard or is it totally external?

thanks

[Salavat Khasanov]

hi!

I connected everything according to your scheme. how to control the temperature of HB?

пятница, 10 января 2014 г., 1:53:33 UTC+3 пользователь ian.b...@stackflo.com написал: