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  1. #11
    Quote Originally Posted by birchy View Post
    K1 is the 24V DC contactor. All the safety stuff will be run from the 24V DC supply, so the E-Stops will be 24V and NOT 240V. I've not yet drawn the latching circuit. The above drawing is only for the AC side of things and doesn't show any E-Stops.
    Ok I will let you off this time

  2. #12
    Birchy thats the safest way to do it especially if you are going to have a hand held control box at any time.

    Damn Andy beat me. Need to type faster.

  3. #13
    FWIW, I work in engineering and have built many machine control panels over the years, so am familiar with standard conventions. However, CNC conversions are new territory and I'm a little concerned that I might blow a drive card or something if I break the wrong circuits on an E-Stop.

  4. #14
    Quote Originally Posted by audioandy View Post
    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.!!

  5. #15
    Quote Originally Posted by audioandy View Post
    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...

  6. #16
    Quote Originally Posted by birchy View Post
    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...
    No but you mention them in your post, my fault for assuming!

  7. #17
    Birchy I take it that your control pcb does not have estop contacts?

  8. #18
    Quote Originally Posted by Web Goblin View Post
    Birchy I take it that your control pcb does not have estop contacts?
    It's a PCPPS V3.0 board. Doesn't appear to have any E-Stop contacts on it. My thinking is that if I kill all the AC devices, then the 50V supply to the steppers will also be killed which should be as safe as it can get?

  9. #19
    It would stop the machine but you would lose position and not be able to restart the job from the same position easily. I dont have any experience with this pcb but I would think that one of the inputs would be able to be configured as a estop sense so that the software can recognise an estop signal.

  10. #20
    Must admit I hadn't really considered maintaining position in order to restart as I assumed that an E-Stop would be in emergencies only because something had gone drastically wrong. Would it not be more accurate to re-zero the tool because it would most likely overrun slightly when the E-Stop is activated? Plus a tool breakage would probably require manual movement of the Z-axis in order to replace it.

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