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

[chefffe]

I use simple Arduino with Ramps controlled by Marlin 2.0. As I mentioned, this is only a MPCNC.

[Chaz]

I use simple Arduino with Ramps controlled by Marlin 2.0. As I mentioned, this is only a MPCNC.

Ok, so can you have an option where, in your code, you enable a G Code and then enable an output signal? I used Marlin and RAMPS for my 3D printers, so it should be possible.

The same way a heatbed is activated (Relays on the board) you can do here. Enable a relay, switch an external relay that has logic. Ill draw a circuit diagram if it helps ... ?

[chefffe]

Yes sure, this might be an option too. How to do it on a Ramps I am aware.
As I also dont see getting these UPF DCM DRV Ports running like I want, I will rethink this. Thank you for now.

[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.

[chefffe]

Thanks for your drawing!

[Chaz]

Thanks for your drawing!

Does it make sense / help?

[Kitwn]

I have a 240v pump which is simply wired in parallel with the mains supply to the VFD. This means the pump runs continuously and therefore removes residual heat after each cut, reducing the starting temperature for the next cut. Simple but effective!

Kit

[chefffe]

Yes it makes sense, just dont know what you mean with "flood".
I am still in building phase of the CNC. Meanwhile I drive the pump simply with +24V and DCM triggering a 24V Relay. That means its always on when VFD is on, thats good enough for now. I will later on realize your idea with switching from Ramps with Gcode which is pretty smart.

I build a complete watercooling solution like for PCs with radiator and fan. What I read in the net, the Spindles dont need high flowrates so the little 12V pump should be enough (I hope).
Another question is for Machine Safety. I included a Killswitch which cuts the 230V input power completely. Now I read somewhere that its better to kill just the wires to the spindle, so that the capacitors cannot uncharge via the spindle and making the spindle down time longer? Is that true?
Do you all use RCD Type B for your CNC with VFD?