Quick addition of 2.2kw spindle with VFD - Is this possible?

[Doddy]

The 0-10v tests ok but the two feeds that went to the sprint board appear to be always closed.

"to be always closed." - you'll have to explain that a bit more.

From what you're written I understand that you've got 0-10V from the Spindle board, and have "somehow" connected this via a connector system to the VFD (guessing through an analogue 10V input, referenced to Analogue ground - two wires). You would then also likely have to reconfigure the VFD to take an analogue input rather than, e.g. front panel control (assuming you're currently using the push buttons for speed control at the moment on the VFD). Of course, you'll also have to work out the forward/reverse discrete controls (although for now you can do this from the front panel).

I can't recall seeing which VFD you've got, if the generic "Huanyang" Chinese jobs then look at:-

PD001 - Run Command : set to 0 (front panel) or 1 (discrete input)
PD002 - Operating frequency (RPM) : set to 0 (front panel) or 1 (analogue input - what you want)
PD070 - Analogue input : set to 0 (0-10V)
PD044 - FOR : set to 2 (forward rotation)
PD045 - REV : set to 3 (reverse rotation)

Preston, eh?, that's handy - if you need a lift with the VFD settings.