12v aux power max current limit ? (RAMBo 1.0e)

[antfurn]

Hi, I want to wire up some 12v strip LEDs and power them off the either of the two 12v aux connectors. But I can't find any reference anywhere as to the max current they can safely deliver.

I have a lulzbot AO-101 with the RAMBo v1.0e

Thanks, Antony

[kakaroto]

Hi Antony,
There is only one 12v aux connector, and one 5v aux connector.
According to the Schematic, the 12V connector is connected to the same 12V layer as the heat bed, so the max current would be whatever the heat bed fuse can support.
According to the wiki, that would be 11A for your 1.0 board :
http://reprap.org/wiki/Rambo_v1.1 :
"F4 supplies the heated bed output. (Version 1.0 has 11A PTC self resetting fuse)"

I hope that helps

[kakaroto]

Sorry, I made a mistake. It's actually on the same power rail as the motors, so the max current would be 5A as the F2 fuse is rated at 5A.

[antfurn]

Thanks for the info.

It's weird, on my Lulzbot supplied Rambo v1.0e - the 'marked as 5v' aux power connection (the one on the bottom left of the board, under the hotend connections) is definitely supplying 12v !