I'm working on a Wirth & Gruffat machining center that utilizes 6 spindles with superior and inferior x and z axis for each station. On the previous shift there was an issue with X5 superior, in the process of it being worked on someone mistakenly unplugged the data cables for X6 & Z6 causing it to lose its position data. After all of the problems were rectified on station 5 an attempt was made to reference the machine, assess how far station 6 was off and correct it and/or reference it if needed. The issue is that the machine alarmed out with an X6 and Z6 axis limit error. Upon clearing the alarm and attempting to initiate the re-reference procedure the X6 and Z6 axis moved very sporadically in the minus direction by only depressing the deadman controls on the pendant. I checked the position data for the axis in question and discovered that both X and Z are both thought to be at a position of 3500+/- a few millimeters. Very unusual that it would automatically move the axis just with the initialization of the deadman switch. The reference procedure calls for the software limit value to be opened to 100 mm. Curious as to whether or not opening this software limit up past the current position would correct the sporadic uncommanded movement long enough to complete the reference procedure. It just doesn't make much sense that the axis would move without a commanded input. Any ideas, info, solutions and/or advice would be greatly appreciated.

Thanks in advance,

Johnny O.

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