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  1. #25
    Community Moderator Al_The_Man's Avatar
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    I don't think pin 1 is a ground on a DB25 printer port? Look at the DB25 port pin out.
    AFAIK the G540 just conditions the two outputs on the DB25 to out 1 & 2 and the outputs are triggered by whatever you have set them for in Mach output configuration.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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    Member kolias's Avatar
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    Sorry Al but I said that output 1 goes to pin 17 which is the GND.

    So the config for these two outputs is done with Mach3 which sounds good, thanks

    Nicolas


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    Member kolias's Avatar
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    Quote Originally Posted by Al_The_Man View Post
    ......This relay would also advise Mach or other controller that a E-stop had taken place.
    Al.
    I don't see an input pin on the G540 to advise Mach that a E-stop had taken place.

    So where do I connect the signal to tell Mach that an E-stop has taken place?

    Nicolas


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    Member john-100's Avatar
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    Hi Nicolas ,

    the E stop input to the G540 is terminal 10

    in the diagram from Homann designs its the "enable switch"
    linking terminal 10 to terminal 12

    in post 16 ,its half of the N/C E stop switch in my diagram

    in the G540 manual its labled as the "disable( E stop)" connection to
    terminal 10

    this E stop signal is combined with signals from the charge pump /watch dog detector circuit and current overload protection circuit

    provided terminals 10 & 12 are linked and no fault is detected
    an optoisolator connects printer port pin 15 to ground pins 18 to 25

    Mach 3 monitors printer port pin 15 to check it is at a logic 0 (low)

    John

    Last edited by john-100; 05-21-2012 at 06:58 AM.


  5. #29
    Member kolias's Avatar
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    My apologies John but I never noticed your schematic in post 16. Thank you for taking the time, it is simple and easy to understand this kind of schematic.

    And now I get it how Mach3 gets the input

    On your schematic why you have 270 Ohms resistors on the 36V line?

    And what is the thing on the bottom relay next to the 24V relay connecting the +24V and -24V lines, perhaps a diode? And why?

    Nicolas


  6. #30
    Member john-100's Avatar
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    Hi Nicolas ,

    the 270 ohm 1 Watt resistor is to drop 12V so a 24 V relay with a 576 ohm coil can be connected to your +36V supply to the G540

    yes that is a diode connected across the third relay
    it provides a path for the back emf when the E-switch opens
    with out the diode the arc inside the switch will shorten its life
    if you use a diode like the 1N4001 , connect the cathode marked with the white or silver band to the positive supply (use any from 1N4001 to 1N4007)

    http://www.vishay.com/docs/88503/1n4001.pdf

    the third relay and a low power 24V power supply is only needed if you use the low current SW-05 E-stop switch to switch the mains supply to
    the 36V power supply for the G540

    a 24V @ 100mA power supply will be enough to power the E-stop relay
    eg POWER SUPPLY 24VDC OUT 100MA - PW2-24

    to power three relays you need a 24V @ 200Ma power supply (if you don't power 2 relays from the 36V supply)

    with the low power 24V supply for the e-stop relay added
    you have a choice of how you power the relays controlled by the two
    G540 outputs

    you can power them from the 24V supply without the resistor
    or the 36V supply with the resistors
    check the coil resistance of your relays is about 540 to 600 ohms

    John

    Last edited by john-100; 05-21-2012 at 10:16 AM. Reason: add not about the diode marking


  7. #31
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    I'm not sure if this has been mentioned....

    I am currently building a CNC router table as well. I am putting in a mechanical selector switch that will allow me to manually disable power to spindle controller (Hitachi X200). I still have a contactor that will be used for the estop circuit but I wanted a mechanical switch to disable the spindle when I am doing a tool change.

    Although contactor failures are not that common I don't want to leave anything to chance. I wouldn't want the spindle (3hp) to start while I had a wrench on it.

    Just my 2 cents...



  8. #32
    Member kolias's Avatar
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    That is always a good idea scgt40. I haven't got yet my X200 so I dont know where to connect the switch. Perhaps the X200 has a location for this switch.

    Where did you connect the switch to disable the spindle?

    Nicolas


  9. #33
    Community Moderator Al_The_Man's Avatar
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    There are a couple of options, If you have a Contactor that is energized when the E-stop is released you could put the switch in the contactor coil conductor.
    If no contactor fitted, a couple of other options for the Hitachi, the input terminals are configurable by code, there is one called FRS Free Run Stop, code 11 and it can be made active Hi or Low as desired, it defaults N.O. = run so it would pay to change it, the other possibility is to put the switch in the feed to the FWD/REV terminals.
    The latter methods do not involve shutting down the VFD.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  10. #34
    Member kolias's Avatar
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    Good options Al, thanks

    I got my linear rails /screws now and started building the cnc. When the time comes for the electrical and I have the X200 I may have to revisit this thread plus I will post my schematic for comments

    Nicolas


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    Quote Originally Posted by kolias View Post
    That is always a good idea scgt40. I haven't got yet my X200 so I dont know where to connect the switch. Perhaps the X200 has a location for this switch.

    Where did you connect the switch to disable the spindle?
    I'm drawing up the electrical drawings now. I can share them with you when complete if you want.

    What I have done so far is to provide power to the X200 via a contactor (for e-stop functionality) and a mechanical switch (for L1 & L2). The mechanical switch would be used when I want to change the spindle cutter. On an industrial machine the accepted practice is to power down and lockout machine when doing anything that could put you or any body part in harms way. I know some people would argue that current technology interlocks are acceptable....I am old school....kill the power and release all stored energy.

    I am slowly reading through the entire x200 manual to make sure I am fully utilizing it's features.

    Hope this helps



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    Quote Originally Posted by Al_The_Man View Post
    There are a couple of options, If you have a Contactor that is energized when the E-stop is released you could put the switch in the contactor coil conductor.
    If no contactor fitted, a couple of other options for the Hitachi, the input terminals are configurable by code, there is one called FRS Free Run Stop, code 11 and it can be made active Hi or Low as desired, it defaults N.O. = run so it would pay to change it, the other possibility is to put the switch in the feed to the FWD/REV terminals.
    The latter methods do not involve shutting down the VFD.
    Al.
    Thanks Al!



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