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

[Doddy]

I wouldn’t have the Sprint in circuit for the new VFD - previous point of all pins floating at mains remains.

I’m not familiar with the Spindle board (and on mobile so not going to start googling) but looks to take step/dir signals to generate the 0-10v analogue output - why not simply use the or a similar replacement (as you suggest) - if it ain’t broke....

The other easy alternative is a parallel Bob with onboard 0-10v output but that would need a PWM Drive from the controlling pc for effective speed control.

I could suggest you’d be best taking the RUN relay output from the Spindle board (if used) into the FOR input on the new VFD