I have some documentation but as I said, it is rather sketchy. Most of the screen shots are in Chinese, the English translations are bad; I've done better with the Mach3 manuals and using the machine docs as clues. I've worked out all my other problems that way and have it running now to where I could use a manual control router to get my job done, but I am still trying to solve the spindle control issue, since I paid an extra $500 for it, and it is too big for a paper weight. I blew out a surge suppressor monkeying with the 220V wiring to verify that the spindle would run if it had power. Fortunately I didn't fry any electronics in the process. Now I need some new parts that I'll have to wait until Monday to get, then I'll try some more experiments.

Do you have a name and model of the VFD as that may get a manual.
Does the relay on the breakout connect to the VFD Start/Stop terminal?
Can you take some pics of the breakout board and post them as it may help.

Hood