The ACORN itself requires 500mA which is listed in the ACORN's manual http://www.centroidcnc.com/centroid_...pec_manual.pdf. I would not recommend using the same supply to both supply your motor bus voltage as well as the logic for ACORN. The ACORN is shipped with a 5V/24VDC power supply. I would highly recommend looking through the ACORN with Leadshine schematic.