Smoothiboard Hot Bed connection?

[plasma]

On the Rambo board I have a separate variable Power supply running at 19v hooked up without SSR to heat my Onix. Is it possible on smoothiboard to have the same connection, or is the Hot bed track shared with the hot end heater? If possible, could someone explain where the the second power supply would be hooked up to on the smoothieboard.

Thanks

[Jimustanguitar]

http://smoothieware.org/smoothieboard has everything you need.

[img]http://i.imgur.com/keOPkoC.png[/img]

"Big mosfets

These are two big mosfets : AOT240L rated up to 40V and 20A ( more with cooling ).

They are usefull for big loads like hotends, heated beds, and crazy things.

The power input is shared by the two mosfets. Meaning the power input ( 5mm and SMT Jack power connector in the middle ) provides power to both of them.

And then each mosfet has its own two-pin output, with the choice between 2.54mm ( not recommended except for light load things like fans ), 3.5mm or 5mm.

We recommend using 5mm connectors ( Blue screw terminals, or green base and green screw terminals ) for all connectors.

You can also take the power from VBB instead of from the power input, using jumpers, see the dedicated part in the non-border stuff section below."

[plasma]

http://smoothieware.org/smoothieboard has everything you need.

Thank you for a quick reply.
However, I did read before I posted and thats what confused me. From the diagram I understood that the power input for the Hot bed is also shared by the hot end. So if I use a 24v input like I do now on the Rambo which is dedicated only for the Hot Bed on the Smoothieboard that input is shared with the hot end. Am I correct? Sorry If it sounds noobish, but I am learning as I go along.

Thanksc

[plasma]

Can anyone help me resolve this?

Thanks

[TFMike]

I would contact richrap, he did something like this for his 3drmega.

[plasma]

Issue Solved. Thanks everyone for the help.

[Mac The Knife]

Issue Solved. Thanks everyone for the help.

??????

[626Pilot]

Each "big" MOSFET has its own power connection, so I think you can use 12V on one and 24V on another, but I'm not totally sure.

I greatly improved my heated bed warmup time by simply putting a dish towel on it while it heats. Makes it come up to temp MUCH faster!

[forrie]

I didn't even need to double up the input wires from my power supply like on the Rambo to get my heated bed warming up in under 5 minutes!

[bvandiepenbos]

plasma
?
mind sharing how you hooked up the (2) power supplies so others can learn?

[jlmccuan]

Each "big" MOSFET has its own power connection, so I think you can use 12V on one and 24V on another, but I'm not totally sure.

I greatly improved my heated bed warmup time by simply putting a dish towel on it while it heats. Makes it come up to temp MUCH faster!

I thought the big mofsets shared their power input and the small mofsets shared their power input. Therefore, one could put 24vdc on the big mofset input and have three separate 24vdc outputs and then put 12vdc on the small mofset input and have three separate 12vdc outputs. Of course you could also use 24vdc or 12vdc on both. The boards are set up this way and if you want to use the VBB input you need to change the jumpers.

[ZakRabbit]

I'm looking at the site right now. At least the 5X has three groups of MOS-FETs: Big, small, mixed (1 ea big and small). The Big pair share an input between pins 2_4 and 2_6, the small share an input between pins 1_23 and 2_6, the mixed share an "input" taken from VBB. Therefore, this can be done. My recommendation would be to input 24v to the big pair, and use either pin 2_4 or 2_6 for the heated bed. Then for the hot end, use pin 1_23 at 12V as that has the larger wire terminal.

[plasma]

I'm looking at the site right now. At least the 5X has three groups of MOS-FETs: Big, small, mixed (1 ea big and small). The Big pair share an input between pins 2_4 and 2_6, the small share an input between pins 1_23 and 2_6, the mixed share an "input" taken from VBB. Therefore, this can be done. My recommendation would be to input 24v to the big pair, and use either pin 2_4 or 2_6 for the heated bed. Then for the hot end, use pin 1_23 at 12V as that has the larger wire terminal.

Thats exactly how I connected the Hot bed to the 24v power supply. Don't forget you have to change the config file to correspond to the new pin assignment.