Where to place an E Stop in CNC wiring Circuit ??

[The Gresley Luthier]

Hi All.

I have started to put my CNC router control circuit together, and I am concerned where in the circuit I should place an E Stop.
I have noticed the my PSU (240 vac > 36 vdc) transformer, on the 36 volt side stays powered for a few seconds, my initial thought was to place the E Stop in the 240 vac line to the PSU, If I am right this will not stop the motors dead will it due to the fact that there are Capacitors on the 36 volt rails keeping them live for a few seconds, or have I got it all wrong.

Regards.

Ray

[EddyCurrent]

If it's any help, here is a link to my schematics, https://www.mycncuk.com/threads/6565...2213#post52213
They have changed slightly since that post but the fundamentals are the same.

I used a PILZ PNOZ Emergency Stop Safety Relay which is much easier to use, they are quite reasonably priced on eBay for example.

Keep in mind you also have to stop the spindle.

[The Gresley Luthier]

Thanks Eddy Current.

My initial thought was to place one E Stop in the circuit, then power all 3, 36v outlets on my PSU through the E Stop, therefore having 3 outlets one to each Stepper Driver. My spindle is 240 vac therefore I will have to have a separate E Stop for it. The ARDUINO I am using has its own fused 9 vdc supply, plus the ARDUINO board carries it's own fuses.

Regards.

Ray

[The Gresley Luthier]

Just had a look at those PILZ relays, a bit steep for me.

Ray

[EddyCurrent]

Just had a look at those PILZ relays, a bit steep for me.

Ray

There's a couple on eBay for around £20 also there are others such as Telemecanique Preventa.
My background is electrical by the way,
I think you need to develop a schematic before deciding what is required.. After that you need a 'box' to put it all in so a scale layout drawing is also required.

[The Gresley Luthier]

Hi, can you send me a link to the item?

Ray