Need clarification on ramps 1.4 power

I have built my ramps but I am not sure which connection to use the 5a or 11a and how do you plug the usb in without over powering it ? I want to be able to connect it to usb to update firmware etc and also be able use it stand alone from sd card.

Thanks Nikki

Edited 1 time(s). Last edit at 04/27/2015 04:00PM by Nikki81.

If you have a heated bed, you need to supply power to both the 5A and 11A connections. The 11A connection supplies power for the bed; the 5A connection supplies power for the rest of the electronics.

You're fine having USB and RAMPS power connected at the same. The USB cable will only supply power to the Arduino board, but isn't necessary for operation as the RAMPS board will also supply power to the Arduino.

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Thanks just to be safe I have removed diode 1 and I'll run the ardrino separately

Thanks Nikki