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IndustryArena Forum > Machine Controllers Software and Solutions > Fanuc > Need Help Takisawa TC-20 Fanuc 21-T Over travel error
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  1. #1
    Join Date
    Mar 2010
    Posts
    130

    Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    Hi,
    I can't home the X or Z.
    Attempt to home the Z come up with a error "500 over travel in the +Z". It fails to move to or away from home.
    The X will move away from home but not to home.
    Any idea greatly apricated.
    Tony

  2. #2
    Join Date
    Apr 2024
    Posts
    12

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    If your current location is already overtravel, I recommend that you disconnect the machine and move manually (rotating yourself the screw) to a location that will overcome the limit.
    Check if the limit switches are working, then proceed as normal.

  3. #3
    Join Date
    Mar 2010
    Posts
    130

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    I have wound the screw back manually but it doesn't make any difference.
    .I wonder if the position encoder is showing the incorrect number on start up and assumes its to far.

  4. #4
    Join Date
    Apr 2024
    Posts
    12

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    It the machine needs home, i think the encoder is not absolute (I can be wrong).

  5. #5
    Join Date
    Dec 2009
    Posts
    967

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    if the zero return way is on + plus side ,you can increase the limit on paramater 1320 with 999999 ,move the axis in minus direction around 100mm,make the zero return and fater that put back the value you found on 1320

  6. #6
    Join Date
    Mar 2010
    Posts
    130

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    I tried that and it still didn't let me move in the -Z, I also can't move the X in the home direction. I have checked the drives and it doesn't show any error. Seems the Z & X will only go in one direction.
    Thanks for your suggest all help is greatly apricated.
    Tony

  7. #7
    Join Date
    Dec 2009
    Posts
    967

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    did you have a tool setter on the machine or the machine had one?The tool setter can block the machine go only in measuring direction
    Also can you send a picture with the first diagnose page while you try to jog the axis?

  8. #8
    Join Date
    Mar 2010
    Posts
    130

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    When I use 1320 at 99999999 it allows me to travel to the home but I can't move back. When I put 1320 back to 5000 (what it was) and wind the ball screw back by hand with the power off. Power up thentry to move to home it errors. I attached pic's.
    Tony
    Attachment 504928
    Attachment 504930
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  9. #9
    Join Date
    Dec 2009
    Posts
    967

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    post the machine position screen when you overtravel and also post what you have in parameters 1815 and in 1320 1321

  10. #10
    Join Date
    Mar 2010
    Posts
    130

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    The machine has a inbuilt tool setter and the points that don't work relay to the same as the axis that don't drive in.

    Attachment 505086

    Click image for larger version. 

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  11. #11
    Join Date
    Mar 2010
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    130

    Re: Meed Help Takisawa TC-20 Fanuc 21-T Over travel error

    If I change 1320 Z to 99999999 as you suggested before I can move right to home on the Z axis but if I leave it at the current setting it just errors with out moving at all. Attached are the images you requested.
    Tony
    Position after error.
    Attachment 505090

    Para 1320 & 1321
    Attachment 505092

    Para 1815
    Click image for larger version. 

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  12. #12
    Join Date
    Dec 2009
    Posts
    967

    re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    Is axis 3 the C axis?
    What is axis 3?
    in the parameters it seems that the 3 axis is using absolute encoders and not incremental
    you need to go to the reference point if you know it and make the APZ from 1 to 0 ,restart machine,put back the APZ to 1 ,restart again
    in this way the new reference point is taking where you let the axis

  13. #13
    Join Date
    Mar 2010
    Posts
    130

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    Axis 3 is the turret tool position.
    By reference point do you mean the home position.
    Do you know the parameter to turn off the tool setter as it maybe causing the issue and if we can tell the controller it doesn't have one we may get the X & Z to move home.

  14. #14
    Join Date
    Mar 2010
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    130

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    Were do I find APZ setting?

  15. #15
    Join Date
    Dec 2009
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    967

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    the tool setter is disabled by keeprelay and is done on PMC by manufacturer,you should have it on the book
    APZ-1815 parameter

  16. #16
    Join Date
    Mar 2010
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    130

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    1815 is already "0" not "1" as I expected see below.
    What happens if I change the limits in 1320 and 1321 to 99999999?

    Attachment 505636


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  17. #17
    Join Date
    Dec 2009
    Posts
    967

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    Because you have APC and APZ set to 0 it means you have incremental encoders using dog for deccelerating and finding the reference marker.
    You can increase the limits ,make the reference zero and put back the values you found there and will solve the problem

  18. #18
    Join Date
    Mar 2010
    Posts
    130

    Re: Need Help Takisawa TC-20 Fanuc 21-T Over travel error

    I changed the 1320 and 1321 to 99999999 & -99999999,
    Still got the same problem sadly.

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