Huanyang VFD, how to get Waterpump switching on with UPF/DRV/DCM connectors?

[Chaz]

It should be as simple as this. Your spindle already has some logic to start stop. Tap into that, use a Normally Open switch (add a new relay if needed) to then feed a Normally Open switch triggered by Ramp's output for M8 G Code which then goes to your Coolant Pumps FWD connection. I've Grounded the common side but you need to work out what your VFD wants here.