Electronics for New Machine + Chinese Spindle + VFD

[JAZZCNC]

Why can i not use a 10Amp mains emergency stop button which cuts power in the AC mains line, thus doing away with the relay, transformer and all associated wiring....
e.g.

I want to keep things simple.

Ok I've done you a quick Diagram but If your not going to listen your just wasting peoples time and I'm time short as it is.! So either take heed or don't waste my time asking questions your going to ignore just because it's not what you want to hear.!!

The reason that isn't safe is because the minute you release the E-stop the machine is live again and in some circumstances could just takeoff if the Control software is still out putting pulses.
Also your dealing with Mains voltage levels at the E-stop switch which isn't ideal. Much better to handle control of high voltage with low voltage switch gear.

Proper Safe system should shut down Critical power in safe manner and inform any relavant parties, ie Control software. Then when fault is cleared power should only be restored in a controlled manner IE: With Reset Button that won't allow Reset unless fault is cleared.

The system I've drawn you is the simpliest but Safest E-stop there is without getting daft. It may look complicated but it isn't. It uses only one 4 pole Normally Open relay for the Safety side and one Momentery NO Switch.

On top of this I've included another relay to give you a better Limit switch system to protect against noise. This uses 24V running thru the switches to control turn on Relay that if tripped or wire breaks then cuts Signal from BOB and informs the Control system Limit trip as occured.
This means the 5V Signal wires form the BOB can be kept very short so much better protected from noise than if running all the way around the limit wires acting like an arial. 24V also keeps the contacts of the switches cleaner so less switch bounce.

I've drawn the Fan running on 48V which isn't ideal because they would be turned off with E-stop but thought you already had them so if you haven't got them already then buy 24Vdc fans and run directly from the 24vdc supply.

All this lot, inc VFD will happily run of a 13amp fuse on a single socket.

Now here's my Disclaimer. Use this diagram at your own risk I accept no liabilty if any errors and warn you it's a minimum of safety.


Regards the Fans then you will get dust even with an extractor so fit a filter. Ideally you want 2 fans with filters blowing Air into the case and then vent hot air out. This provides positive pressure and keeps dust out while rapidly removing heat.
Your lack of space makes this even more important so skip this step and you'll shorten life of anything in there.!