Right we now know what a PRT E1500W is. It's the inverter for the machine and not the control box.

Did they supply a Mach setup file with the machine. It should end up blar-blar.xml ?
If so you need to copy this into the Mach3 folder and when you start up, use the icon that says mach3 Loader and select that name.
Try that and let us know.

Where in the country are you ? Someone may be local to you.