2/13/2023 0 Comments Project xto7 serial![]() ![]() The software is now working well enough to test the hardware, which is yet to be built. It has an input pin for the value to convert to a binary bit stream output pin, plus output pins for Clock and Load*. The software interface with EMC is an HAL component. It has just the features I need, which helps to make it easier to implement than more complex DAC's. The DAC is a Linear Technologies LTC1257 12 bit unipolar converter. ![]() An overview of my plan so far is shown below. ![]() My VFD's are set up to be controlled by a 0 to 10 Volt analog signal for speed and sinking Forward or Reverse to a Control Common terminal for rotation direction. This page will contain the information I gather for developing an adapter between EMC and VFD's, or more generally, a DC analog adapter In addition to driving spindles, I found small VFD's on eBay cheap enough to use as three-phase converters for coolant pumps. Other than some torque issues at low speed, they work pretty well. I have VFD's driving the spindle motors for my Bridgeport and a couple of lathes. ![]()
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