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I have a RAMPS 1.4 with Arduino Mega 2560 with 2 steppers connected to an external power supply using Polulo stepper drivers. The steppers are for X and Y axis movement. This external power supply is set to 12 volts and power is applied. I have configured the marlin firmware also.

Can I connect my setup to my PC using USB when the external power is also on? If i connect the USB while the external power is off, do the motors take power from USB? Will this will burn my board?

1 Answer 1

The motors are powered from 12/24V external power supply, so the motors will not be powered. the ramps Schematics shows the connection diagram and the power is provided via the VMot pin/12V.

Stepper diagram