Your first question should be why does it fault. Your VFD should never fault, unless there's a problem. If it's faulted more than once, than you have a problem, and need to fix it.1) Is there a way to have mach3 receive an input from the inverter in case of a fault
No, you need a board that can convert PWM to 0-10V, like this. https://www.ebay.com/itm/Upgraded-5-...kAAOSwIFtaAfTm2) Is there a way to control spindle rpm via mach3 with my current equipment and again if not, is it possible with some extra hardware and if so, what hardware?