The explanation of the message is:
Line 1: Shows that node 1020 is changing state between two successive iterations. The (0, -1, 0) indicates the direction cosine of the restraint.
Line 2: Shows that in the previous itertaion the restraint was active, i.e. the pipe was agains the restraint.
Line 3: Shows that in the current iteration the restraint is inactive, i.e. the pipe moved off of the restraint.
You can find a lot of information here on the "Convergence" issue, just search on the work "convergence".
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Regards,
Richard Ay - Consultant