Quote Originally Posted by mturneruk View Post
Thanks again for your help chaps.

It seems sensible to have the whole system shut down when e-stop is pressed. I would agree that it's a basic safety requirement.
So the next question is how to do that with a relay?

Jazz.
5v transformer in the box sounds sensible. I should be able to get a very small one. This could also possible run the case fans instead of 48v.

I think I understand what your saying about having one plug socket.
I would love to use one socket, but I was told to use 2 plugs by someone else at CNC4YOU so as not overload the wall socket. I thought 13A was the max?
Isn't the VFD using 8amps ish and the steppers / 600w power supply using a load more. E.g. Taking the load over what you can pull from a standard house socket?

EDIT : Can anyone confirm how many amps should be allowed for VFD driving spindle + 600 watt power supply driving stepper motors?

Obviously it's confusing on the forums, cause you have a load of guys talking about 3 phase and it's hard to tell what's what.
I thought I knew what i was doing. Obviously not.

If I have to scrap the case and get / make a bigger one I will (Or i might just take the VFD out into it's own box), but it would be nice to get it all in one.

Cheers
Martin
I run my 2.2kW VFD on a 13A plug, same for my CNC router which powers the driver PSU (gives 72V DC) and the 230V AC driver I have for my Nema 34 motor.....they're on the same circuit.

I'm sure Jazz will come back with a wiring diagram shortly....I'm on my mobile whilst cutting stuff on my machine!!! In essence if you get a 24V (DIN rail mounted) PSU (1.5A or there abouts) and take the +ve from it through the E_stops and into a relay (take the -VE to the relay too but direct), when you hit the E-stop button it cuts power to the relay. You wire your mains through the relay contacts (NO) so that when it drops the power to the relay (E-stop) it cuts the power (the contacts open as no power to the relay) to the drivers etc. You can then get 24V fans for your case and supply them from this PSU as well! I suggest 24V as it's pretty noise resistant so good for safety circuits.