VFD Wiring Diagram

[JAZZCNC]

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.

[EddyCurrent]

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.

I've come across this several times and it's why I mentioned it above, the last time was with a 120kw inverter driving a steel beam straightening machine and due to the HSE requirement of stopping the machine within 10 seconds ( I think that time is right) it was best to allow the drive to ramp it down. If it had been left to coast down it would have taken ages to stop and a physical brake was not an option.
Using the on board output relay of the drive to detect 'motor stop' the power supply was then removed from the inverter as you say.

[JAZZCNC]

I've come across this several times and it's why I mentioned it above, the last time was with a 120kw inverter driving a steel beam straightening machine and due to the HSE requirement of stopping the machine within 10 seconds ( I think that time is right) it was best to allow the drive to ramp it down. If it had been left to coast down it would have taken ages to stop and a physical brake was not an option.
Using the on board output relay of the drive to detect 'motor stop' the power supply was then removed from the inverter as you say.

Ermm how does that make it safe.? What happens if the Drive fails what stops the machine then.? But in all honesty these examples are so far removed from each other that it's not worth the effort going any further on this.

Tom's got what he asked for and it's safe enough for his needs. If it's not connected to Reverse then can't go backwards so switch not required simplizzzz.

Regards coasting then again not often a problem with these small spindles and taking DC braking to far without Brake resistor can lead to Trips etc so often having longer ramp down is advised, esp for those who are not used to DC braking and the Complexity's of Setting VFD's correctly.