Thursday, May 28, 2020

Root 3 CNC - Running power for the VFD

In order to run the VFD/Spindle on a second circuit, another power cable and cutoff switch was purchased.  This is basically the same process used when running the power for the Arduino/RAMPS/motors, only with larger gauge wires.

The components used were:

  • 12/3 SJOOW cable from Home Depot
  • 12/3 extension cable from Amazon (this is a 20A cable incorrectly labelled as 15A)
  • Powertec 71007 Paddle Switch from Amazon
  • 1 gang weatherproof box from Amazon


First the wires were pulled into the box, and ring terminals soldered onto the ground wires:


The ground wires were connected to the box:


Hot and neutral wires were run to the switch screw terminals, and covered with electrical tape:


The screws that come with the Powertec cover are not compatible with US boxes.  They were discarded and replaced with standard outlet cover screws:


Finally the cover was installed and mounted to the CNC cart:



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