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Hi!
Try to connect +12V-I to probe input when touching, not GND. This works for me!. (I tried out using a 1k Pullup for probe, inverting the input signal by the configuration but had no luck - which may be due to another error I had (my fault) - after detecting this error I did not try the pull up version anymore because I implemented the "normal" solution in between (also, since my spindle axis has no conducting connection to ground because of ceramic bearings...)
Josef
See also other postings concerning the problem posted by me in this forum.
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Posted at 2019-2-22 20:43:39