E-STOP Circuit - will this cause any problems?

[birchy]

I have a 3-axis CNC kit from Zapp which consists of 3Nm steppers, M542 drives, 50V PSU and a PCPPS V3 interface board. Bought it some time ago but only just getting on with it. You know what these projects are like...

For the E-Stop circuits, I'm going to use a Telemecanique contactor with a latching circuit and a reset button. Obviously all the stop buttons will be wired in series with dual N.C. contacts on each. I was planning to maintain a constant 24V DC supply for the safety circuit and then drop all remaining AC supplies which would be the Milling machine I'm converting, the 50V PSU and the PC. The PCPPS board would still be powered as it will be connected to the 24V DC supply. Will this setup cause any problems or risk buggering any of the components? I can probably cut the 24V to the PCPPS as well but may not have a N.O. aux available on the contactor.

[JAZZCNC]

Yes this will work fine and using relays it's basicly how I do all my control boxs. It's very Safe and much better at handling noise.

Leave the PCPPS powered, Don't kill the PC power and if your using a VFD for spindle then Keep the VFD powered but kill the Run signal.

[Web Goblin]

Is K1 going to be the emergency stop contacts?
If so why are you killing power to the pc. If you do this you wont be able to restart any jobs after an estop activation. You would need to home the machine again.

[audioandy]

You DON'T run mains voltage through an E Stop circuit!

[Web Goblin]

Right enough Andy, I missed that bit but the drawing is not complete and I just assumed that he would be using a 24VDC coil and usin the maintained 24VDC supply for the estop circuit and switching the 240V AC.

[audioandy]

Right enough Andy, I missed that bit but the drawing is not complete and I just assumed that he would be using a 24VDC coil and usin the maintained 24VDC supply for the estop circuit and switching the 240V AC.

Yes you are right it's not complete, I have assumed that K1 and K2 are the E Stop N/C contacts, no doubt birchy will be along shortly to clarify.

[JAZZCNC]

Yes you are right it's not complete, I have assumed that K1 and K2 are the E Stop N/C contacts, no doubt birchy will be along shortly to clarify.

I didn't think anybody would be that Stupid Andy and also like GOBY presumed it incomplete.!! . . But suppose I should know better Esp after Seeing first hand the Strike time Bomb.!!

[Web Goblin]

I didn't think anybody would be that Stupid Andy and also like GOBY presumed it incomplete.!! . . But suppose I should know better Esp after Seeing first hand the Strike time Bomb.!!

I didnt think I had said anything that required being called "Goby" but never mind.

Birchy the estop input is not relying on the software to stop the machine but rather informing it that an estop has occurred but I think youve got that now.
I would still leave the pc on a seperate supply though but thats a personal opinion. I would not like a fault on the machine control side to trip the mcb and dump the pc at the same time.

[JAZZCNC]

I didnt think I had said anything that required being called "Goby" but never mind.

Didn't say anything wrong and No offence ment Mr was just being lazy.!!

[birchy]

Yes you are right it's not complete, I have assumed that K1 and K2 are the E Stop N/C contacts, no doubt birchy will be along shortly to clarify.

As I said previously, K1 is the contactor. Terminals (1) and (2) are N.O. contacts that will switch the L and N when the contactor is latched following a reset. The latching circuit will obviously drop out if an E-Stop is active. BTW, there aren't any N.C. contacts on the drawing I posted...