You can't see it in the pic without enlarging it, but he has the cap in the bottom of the cabinet that wasn't connected labeled as "extra". Guess it was a spare.
I was referring mainly to low voltage control wiring. I'd like to keep the controls on front of my lathe (with the addition of a speed pot) and control the VFD from the lathe. Unfortunately, I don't have a schematic for my lathe so it'll be quite a bit of wire tracing.
On my SouthBend 13" lathe the control was a 3 phase drum switch. After I wired the motor directly to the VFD I wired the 3ph drum switch to the VFD using just one of the three poles as low voltage control lines. I used three 18 gauge shielded stranded wires. Ground, Fwd, Rev. Then I had to tell the VFD to use external switching controls and an always on switch (as opposed to a momentary switch). I used 3 more 18g shielded stranded wires to install a mini potentiometer mounted in the rotary switch box. It ended up working exactly like the original controls with the addition of speed control. There was an option to NOT start the motor if power is applied to the VFD while the switch is in the FWD or REV position; which I enabled.
