Hey Atroz,
just an addition, I think you already know that – at least when I looked at the circuit the last time – the big red/yellow button on top of the Onefinity Controller case is NOT wired to enter the smart “estopped mode” which will make sure the spindle is also stopped (or the “tool-enable”-wired router), but instead just cuts power to the Onefinity Controller at the input of the internal power supply (and leaves spindle running!). If you want to use the true “estopped mode” of the Onefinity Controller, either you got to have the Emergency button wired to pin 23 of the 25-pin I/O port and ground (as described here), or you use the red/yellow Emergency Stop icon that is shown on the top right of your display to enter this mode.
What is important to know (possibly also for others finding this thread later), is that there is a standard way to put a VFD in a safe mode to be able to change the bit, and it’s not powering the VFD off. It’s not correct to power off the VFD for this and it’s also not needed.
Furthermore it can harm the VFD if you constantly power it on and off. In the manual of my VFD it says:
Do not turn on the power and then turn it off again more than once every 3
minutes. Doing so may damage the Inverter.