Dialog 4 Error Code 14
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    Default Dialog 4 Error Code 14

    I've found an issue with my Z axis. (After fifteen years!)

    It appears we don't have all the 450mm of Z-Axis travel. I noticed the limit switch cam plate looked different than the others, and in fact someone has made a slightly longer version to stop the Z-axis using the last 79mm of travel.
    When I remove it, the error message 'Code 14' appears, indicating a problem with the LS904 scale.
    Since this area of travel is very rarely used on the machine, it has therefor never been noticed. But, I now have a job where I need all of the 450mm.
    I have had the scale professionally examined, and other than a weak reading from the scale 'head' there are no serious issues revealing themselves. I have been informed that the issue he found with the 'head' would if anything stop the scale working completely, but not in the specific area we have the issue.
    I can have the scale head refurbished, but this still may not cure the 'black spot' area.

    Any ideas?

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    First note:
    There are two limit stop cams that Deckel used on that machine.
    The shorter travel version was used when the universal table was fitted.
    The 2038 table is taller and the extra height is needed to allow the top to rotate over the "X" slide...The short travel cam is used for safety...

    There is a companion part that is also fitted when the 2038 table is fitted..It is an extended hard stop that physically limits the travel.....

    Need to be sure that your machine is not fitted with this stop.
    Be sure that you have free travel to the top of the slide (hand wheel)
    If not check to be sure the hard limit is not fitted....

    Sorry i don't have my FP4NC book here to show the location of the stop.
    If you look under the "Z" slide on the side away form the operator, nested between the raised portions of the box way...there are two cap screws that secure a plate between then.
    That plate carries the stop block which sits vertical in a pocket.

    Other than that...I would have the scale cleaned by a competent service agency (Heidenhain) or do so your self....Some instructions on this board nicely done by Bruce...
    But my suspicion is that the scale is working well enough....generally problems reading the scale result in an error indicator showing the letter "V" to the right of the axis numerical display.....

    Might try swapping the axis cards...(be sure to set the DIP switches) Doubt this will make any difference.....

    Cheers Ross



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    Ross,

    Regardless of the stops (I removed it, carefully), the machine wont travel the full 450mm because there is an error in the scale. It simpley stops 79mm short becase of a Error Code 14.
    The Heidenhain engineer has run tests on the scale, and cannot find any errors to cause and individual positioning error. Only that what he found may cause complete error over the full range. Which in my case isn't happening.
    It has since been suggested that the scale wasn't fitted parallel to the axis, and may be pulling the head when it reaches its furthest extreme.

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    If you set the machine to run using the hand wheels, and advance above the stop point by hand does the display still read correctly?
    And will it return to the same point when going back down (set an indicator to verify)

    Not seen this fault and as i said before, the machine should show an error on the axis display if the scale is being cranky....
    Scale alignment is set by the machine....you just seat the ends of the spar against the machined pads on the casting and the scale is aligned....
    Only other setting is to set the gap between the read head outer part to the scale body. Should be set at .040" (1mm) ...I use two feeler gauges one top one bottom so that things are parallel...

    Cheers Ross

    Additional thoughts....Would first be sure the Tach comm is clean...Yea i know the scale is the issue...but the error code says that its a "Contour" error...suggests that the scale and the slide velocity are not happy....
    Would also be sure to adjust the "Tach" and drift on your Bosch cards before going too far...

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    Tach and drift are fine. I've already gone through that .
    However, trying to wind past the point in 'hand' . I thought about that as well, I shall give it a try but I need to wait for the scale to come back from the specialist.
    Should be interesting to see what we get back from the measuring system, right?

    Ta,
    Nick,

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