by rsm5178 » Fri May 02, 2014 10:22 pm
My RAMPS 1.4 will disconnect from my computer when I connect a 12V power source
When I have my RAMPS 1.4/Mega board connected to my computer via USB, the connection is fine. Repetier Host will recognize the printer. When I connect the 12V power source the RAMPS board disconnects from the computer. It appears that the USB power source is over ridden by the 12V source?
Any ideas?
I found this out when I was trying to PID tune my extruder heater.
I am able to control my motors with only the LCD controller and the power source.
My setup:
Sainsmart kit that you see on ebay with the Mega board, RAMPS 1.4, heated plate, end stops, stepper motors, and the large LCD controller (RepRap Discount Smart LCD Controller equivalent)
Power source: 12-16V laptop power pack. 6.6A max
Marlin firmware