I'm having a devil of a time getting the last bits operational. I can get the VFD to control the 800W spindle from the panel, I can get it to control the speed from the analog dial on the VFD. The XPro v4 is doing a great job moving the motors. But I cannot get the XPro v4 to control the spindle speed. After getting the spindle turning manually, I did the following: Connected the spindle control pin to "VI" on the VFD. Connected the ground pin near the spindle control pin to "ACM" on the VFD Moved the jumper on the VFD to bridge pins 1 & 2 (from previously bridging 2 & 3) Set PD002 to 1 (external control) Set PD070 to 0 (10V range) Set the switch on the XPro V4 to 10V. I'm using CNCjs, which for the most part does quite well. But sending M3 or M4 does not make the spindle move at all. I used the interface to set an rpm of 1000rpm and then measured the voltage at VI and got 9.83V so that seems to be working normally. Photo of the VFD wiring is included. At this point I'm at my wit's end. Any suggestions?