Quote Originally Posted by EddyCurrent View Post
Dean, I know you know what you're on about and I know Tom asked for a simple diagram but in addition to your diagram I would personally program one of the digital inputs as a STOP/RUN signal. For me this is standard procedure such that you have to select both RUN and FWD to get output. While it's not used in this application it makes more sense when you want to change direction.
Tom wanted it simple and that's what I gave him.

Agree that if wanting to change direction then having some way to select direction, whether that be thru outputs or selectable switch is a Good idea but Because he's using the 2.2Kw spindle with a Minimum usable RPM of 5000Rpm then I very much doubt he will want to change direction so why bother complicating things.!!. . . . The only way it can run is FORWARD and the relay acts has a RUN switch. . .Simple.!

Now there is a case for routing RUN signal thru limit system so Spindle is hard-wired to stop rather than relying on Software stopping if limit is Tripped.
In case of E-stop then really you wouldn't have RUN signal tied to this because safe E-Stop should Kill power To VFD and everything else on machine.

So if I changed my drawing at all it would be to show Input lines going thru Limit system but that's about it.

BUT KISS will work fine here I'm sure.