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Question #: 14489

Question: limit switch does not work as wired mach3 usb

Current Solution

Are you connecting the limit switch in normally open mode? I would suggest connecting a single limit switch from the DCM terminal to one of the input terminals. Make sure you have a 24v power supply connected between the 24V terminal and the DCM terminal.

Additional Information:
Are you connecting the limit switch in normally open mode? I would suggest connecting a single limit switch from the DCM terminal to one of the input terminals. Make sure you have a 24v power supply connected between the 24V terminal and the DCM terminal.

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Other Possible Solutions to this Question

  • Mach3 USB Interface Board, My switch inputs are def wired active-LOW but I need to set them as active-HI (red x) in ports & pins to make them work correctly, why would this be?

    The inputs on the Mach3 USB board require that you complete the circuit with the V-, so that means that the inputs will fire on a high signal, hence the "Active High". That is simply how the Mach3 USB board is designed. The inputs, output and spindle connections on that side of the board require the V+ and V- to be connected to a 24V supply (most spindle VFDs have an available 24V output terminal for this use).

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    Mach3 USB Interface Board, My switch inputs are def wired active-LOW but I need to set them as active-HI (red x) in ports & pins to make them work correctly, why would this be?

  • Mach3 USB Interface Board, Backlash Compensation in Mach3 is not working. Does this board support the backlash function?

    In our experience, the backlash compensation is not an ideal mechanism to solve backlash issues. It is best to resolve the backlash issue mechanically regather than through software.

    Boards that handle all instructions on its own chip (which is the case for this all other USB boards) take some control away from Mach3. Without Mach3 having granular control. With that said, we do not have experience with the backlash compensation with that particular board. Our experience with backlash compensation with other boards have resulted in very poor accuracy and undesirable geometrical moves.

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    Mach3 USB Interface Board, Backlash Compensation in Mach3 is not working. Does this board support the backlash function?

  • What power supply do you recommend for the spindle and limit switches if I buy the USB Mach3 breakout board?

    Any of the following power supplies will be fine for powering the Mach3 USB controller:
    https://www.buildyourcnc.com/item/24v

    however, the limit switches do not need high current, so the following power supply is sufficient for the task of connecting limit switches:
    https://www.buildyourcnc.com/item/electronicsAndMotors-power-supply-24v-1a-dc

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    What power supply do you recommend for the spindle and limit switches if I buy the USB Mach3 breakout board?

  • limit switch triggered in mach3

    http://buildyourcnc.com/PrimeronHomingandLimitSwitches.aspx
    There is a pin setting in Mach3 that says how to react to the inputs from the switches. Your setting is probably wrong as the trigger happens immediately.

    You may want to think about shielded wire and/or a resistor on each limit switch line. If there are stray wires, connect them to ground. Additionally, the shield from the shielded cable insulation should alse connected to ground at both ends.
    Try upping the Debounce interval in Mach3. You have to adjust the debounce interval. You go to config,general config, and it is in the top right corner. I set mine to 100 and it seems to work well.

    Additional Information:
    how to solution cnc revo 540 limit tripped error?


    Additional Information:


    Additional Information:

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    limit switch triggered in mach3

  • Does the Laser Controller work with Mach3?

    The laser Controller will not work with Mach3.

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    Does the Laser Controller work with Mach3?

  • I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

    Yes, the best way to attach a relay to the output of the Mach3 USB board is to use an SSR (Solid State Relay) at the 24 Volt rating. This is the standard supply for this side of the Mach3 USB board.

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    I am converting from a Parallel Port to the Mach3 USB. My limit switches can accomodate up to 5VDC and I want to Drive a Relay from one of the outputs. Will my switches work and do I need a 24VDC Relay?

  • When the machine hits the limits it stops but the switch is still tripped so clicking the Mach3 RESET button doesn't do anything. How am I supposed to get the machine to move off of the limit switch so I can continue working?

    If you select the Settings Page and select or tick Auto Limit Override - this will allow you to back off the switch.

    Additional Information:
    limit and home switch

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    When the machine hits the limits it stops but the switch is still tripped so clicking the Mach3 RESET button doesn't do anything. How am I supposed to get the machine to move off of the limit switch so I can continue working?

  • Using USB Controller Board with Planet-CNC software. The S/W recognizes limit switches but not soft limits. Help?

    "Soft limits are used to decelerate machine to stop before machine is stopped hard way at limit switch or before it crashes. I recommend "Soft Limits Decelerate" and "Soft Limits Strict" settings are also checked. Sometimes we need to disable soft limits and there is a command for this in menu "Machine/Soft Limits". When soft limit is triggered position display will be yellow."

    Are the soft limits "grayed out"?
    Here is a link to a very useful forum post from the Planet-CNC crew:
    http://www.planet-cnc.com/faq/machine_setup/



    Additional Information:
    i keep getting scratches when engraving pictures on dog tags

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    Using USB Controller Board with Planet-CNC software. The S/W recognizes limit switches but not soft limits. Help?

  • Limit switches connect to AWC708c laser controller

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

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    Limit switches connect to AWC708c laser controller

  • Laser controller limit switch connection

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

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    Laser controller limit switch connection

  • Does Mach3USB have a selection for motor tuning, if so, where, the selection in the config menu doesn't work

    The motor tuning for any controller under Mach3 is independent of the actual controller. It is actually a function of the steps per unit and setting the velocity which is units/minute and acceleration which is units/minute/minute.

    To adjust the velocity, acceleration and steps/unit, click on config -> motor tuning.

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    Does Mach3USB have a selection for motor tuning, if so, where, the selection in the config menu doesn't work

  • Does Mach3USB have a selection for motor tuning, if so, where, the selection in the config menu doesn't work

    The motor tuning for any controller under Mach3 is independent of the actual controller. It is actually a function of the steps per unit and setting the velocity which is units/minute and acceleration which is units/minute/minute.

    To adjust the velocity, acceleration and steps/unit, click on config -> motor tuning.

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    Does Mach3USB have a selection for motor tuning, if so, where, the selection in the config menu doesn't work

  • How should I connect the limit switches to my laser controller?

    If you are using the AWC708 or equivalent laser controller, the limit switches will connect between the EL input terminal and the GND terminal in normally open (NO) connection. Most limit switches can be connected as NO, or normally closed (NC).

    For instance, a limit switch for the X- limit will be connected from the ELX- terminal to the NO connection of the limit switch, then a connection from the GND terminal on the laser controller to the COM connection to the same limit switch.

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    How should I connect the limit switches to my laser controller?

  • WILL THE USB BREAKOUT BOARD WORK WITH MACH3?

    Sure, the USB interface has a place for 4 axes of limit switches.

    Each axis can have two limit switches: one for the ++ (positive) end and one for the -- (negative) end. The positive end would be the limit switch at the end of the machine that, say the machine has a 4'x8' area, reaches a bit after the 8 foot mark. The negative end would be the limit switch behind the 0 foot location behind the origin. If the origin is in the middle, the negative would be at a little more than the -4 foot end and the positive would be at a bit more than the +4 foot end. Note that you can have more than one switch on each pin where the NC is connected in serial fashion and the NO is connected in parallel fashion (this can be seen on the diagram in the multiple limits switch section). The software configurations for the limits switches are under File -> Settings -> Limit.

    A typical limit switch has three connections on it. These connections consist of COM (common), NC (normally closed) and NO (normally open). The COM would generally go to GND and the NC or the NO would go to the pin. If the NC is used, then the the switch is constantly connected until the switch is pushed (engaged) then the connection from the pin to gnd is broken (open). Use the settings in software to set whether in NC or NO configuration.

    Let me know if this information was helpful (or not) by adding information to this question. Thanks.

    User response:
    Thank you very much for this helpful information. I'm still a little fuzzy on how the 6 limit switches physically connect to each other and to the USB breakout board. You've stated one switch (home) goes to positive and another switch (limit) goes to negative. Are all the GND prongs from all 6 switches connected to each other and going to GND on the breakout board, or no? And the NC prongs, how exactly are they connected to each other? And to the board? There has to be a diagram somewhere shows this visually, no? I don't know how to wire the switches in series or in parallel. I have already physically installed all the switches on the machine and ran the wires to where the board is. Now I just need to know where to plug these wires into the board. Also, taking into consideration that I'm using the Planet CNC software, the only settings I have pertaining to limit switches is "Enable/Disable" for each axis, and the actual limit for each axis. Nothing about NC or NO. Is that only in Mach3?
    Thank you.

    buildyourcnc response:
    On the USB interface, the COM on the switch connects to GND and the NC or NO connects to the input pin (i.e. x++, y--, etc.)

    Limit switch configuration is rather difficult to understand, especially with series and parallel. You can think of series as a single wire going from GND to the axis letter input terminal (i.e. X++ or X--). If the wire is broken, then the circuit is open (or the switch is engaged in a normally closed scenario). Normally closed is like an actual wire, and when engaged, the switch "opens" (breaks the wire). This is why we recommend in some systems that you can put many switches in series on a single pin. When one of the switches is engaged (breaking the connection) then the entire circuit of switches is broken and the machine stops.

    In a parallel scenario, the state of the circuit is always broken until the one of the switches is engaged and the circuit is then closed or connected. The topology looks like a ladder. All the switches connect to both sides of the ladder and the switches are like the runs of the ladder (the horizontal bars that the feet are placed while climbing). Imagine all of the switches broken in this scenario (normally open). It would be like the ladder could be split in two, but if one of the ladder runs (switches) is closed by engaging it, then that run would connect both sides of the ladder and the two sides of the ladder would have a connection.

    There is a diagram on the USB page of the various limit switch configurations. If you need more information (visual and/or otherwise), please let us know and we will immediately add that information to benefit everyone.

    Click the link to respond:
    WILL THE USB BREAKOUT BOARD WORK WITH MACH3?

  • Will the USB breakout board work with Mach3?

    Our newer USB board will work with Mach3 and can be found here at this URL:

    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Click the link to respond:
    Will the USB breakout board work with Mach3?

  • I can't get the Mach3 USB interface to work

    Please follow the steps on the following webpage:

    https://www.buildyourcnc.com/item/electronicsAndMotors-electronic-component-breakout-Mach3-USB-Board

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

    Additional Information:
    Mach3 interface board not connected

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    I can't get the Mach3 USB interface to work

  • DOES MACH3 WORK ON A MAC?

    There are several CAD/CAM programs out there for MacOS. Here is a list of a few: http://www.macuser.de/forum/f53/3d-2d-cad-395058/#post4499316
    I've also read good things about punchCAD: http://www.punchcad.com/
    Of course, there is always SketchUp if you are in a pinch. There are a few CAM plugins for SketchUp as well, but I've never used them, so I can't vouch for them.

    CAD/CAM will get you as far as designing your parts and producing the g-code, but if you also want to run the CNC machine with your Mac, you will need a piece of software similar to Mach3 or EMC to run the g-code. I haven't been able to find anything like these programs that runs on Mac, so you may have to run Mach3 or EMC in Windows using Boot Camp or a virtual machine such as VMware or Parallels.

    Personally, I would use the Mac to do all the CAD/CAM, then use a cheap PC to run the CNC machine.

    Additional Information:


    Additional Information:
    EasyDNC for OSX
    www.dnc-x.com

    Additional Information:

    Click the link to respond:
    DOES MACH3 WORK ON A MAC?

  • x and y on plasma does not work but x and y on mill does work. why?

    I assume you are referring to Mach3 mill versus mach3 plasma. These are two xml files that contain settings for "mill" and "plasma".

    If the machine moves (the stepper motors are moving and the drivers are receiving signals from the controller) in the settings for mill, but are not moving in the plasma settings, then you need to deeply investigate the settings and make sure they are exactly the same in the:
    - motor outputs tab of ports and pins dialog box
    - port address in the ports and pins dialog box

    If you are just trying to move it manually, make sure the jog button is "on" in the program run tab. Press the tab button to reveal the mach3 pendant screen and make sure the jog is set to continuous.

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    x and y on plasma does not work but x and y on mill does work. why?

  • I have a usb cnc driver board on your 1'x3' cnc and i cant get the z+ limit switch to stop the machine in the provided software. It registers the button but doesn't inhibit movement. inversly the button works when selected as '-' for negative movement.

    All USB boards, are tested and checked before shipment for all axis, and inputs. Here is a link with clear instructions on how to setup Planet-CNC (http://www.planet-cnc.com/faq/machine_setup/).

    Please check continuity and for any crossover disruption when wiring your board, try to wire each as cleanly and with out crossing any live power wires and or motor motion wires.

    Click the link to respond:
    I have a usb cnc driver board on your 1'x3' cnc and i cant get the z+ limit switch to stop the machine in the provided software. It registers the button but doesn't inhibit movement. inversly the button works when selected as '-' for negative movement.

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