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

[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?

[Kitwn]

Like stepper drivers, the VFD can suffer terminal damage if you connect or disconnect the load when powered. Putting a kill switch in the spindle wiring is only appropriate if you believe there is a real risk of someone getting an electric shock from the spindle itself and don't care if the VFD gets wrecked to save them. If you believe such a risk is real then you shouldn't switch it on in the first place! Safety in this respect has more to do with adequate earthing and proper installation of the wiring. If you're still worried then never touch the powered spindle.
How long the spindle takes to run down to a stop (which is what I think you mean by the spindle 'down time') is not relevant in regard to a personal injury from the spinning tool since by the time you or someone else gets to hit the kill switch it will be too late.

[chefffe]

Ok thank you. I have no experience yet. I just did my first part today (just a little cut on a plate to 230x230) and it worked great. I will keep then my Killswitch as it is but will use a RCD Type B.
Just bought one with pretty insane price ... :-)

[Clive S]

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?

What ever you do. Do not put any switch between the spindle and the vfd as that would kill the vfd.

[Kitwn]

It's also worth pointing out that an RCD will not give you any protection in the event of a shock from the output of the VFD, only from contact with the mains supply. The choice of RCD type relates to the risk of spurious tripping caused by earth leakage in the VFD input filter.

[chefffe]

I built yet lots of 3D printers and such things and I have a solid education with electrics.
Just VFDs are completely new to me. I found information that a B-Type RCD should be used cause of the direct current which might give an issue when using VFD.
Its also important to know that between the outputs there should never be any switch, Thanks!

[Clive S]

I found information that a B-Type RCD should be used cause of the direct current which might give an issue when using VFD.

That's a new one on me. Would you mind giving a link to the info so we can all be educated.

[chefffe]

The maker of the program "Estlcam" mentioned that in a german forum:
https://cncwerk.de/forum/viewtopic.php?t=611

Here is the same info:
http://cnc.a-ueberbach.de/spindle/al...schalter_fircd

Translated with Google:
Residual current circuit breaker (FI / RCD)

In the case of a fault, DC residual currents with low residual ripple or high-frequency pulsating fault currents can occur in frequency inverters, which do not recognize the residual current circuit breakers normally installed in a domestic installation (FI type A). Likewise, the possible DC components in the fault current can lead to a saturation of the coil installed in the FI and render it significantly less sensitive to alternating currents.
According to VDE 0100-530, all-current-sensitive RCCBs (also known as RCD type B) must be installed here, but this entails costs of a few hundred euros.

[Clive S]

Well I read the forum posts you linked to as the spindle is not correctly grounded (ie only through the screen) If the spindle only has a 3 pin plug then I always change that to a 4 pin and connect the 4th pin to the spindle socket screw. Then use 4 core to supply the spindle with its 3 phase and earth.