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Tuning Tool Step Move Timeout


eloew61
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When performing a two-way step move using the tuning tool (Position Interactive), the load moves the desired number of counts in the positive direction, stops, and fails to return to the initial position. The move then times out without a plot. When performing a one-way step move, the load moves the desired number of counts in the positive direction, stops, then the move times out without a plot. Can anyone explain this behavior?
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[quote='eloew61' pid='341' dateline='1268859228'] When performing a two-way step move using the tuning tool (Position Interactive), the load moves the desired number of counts in the positive direction, stops, and fails to return to the initial position. The move then times out without a plot. When performing a one-way step move, the load moves the desired number of counts in the positive direction, stops, then the move times out without a plot. Can anyone explain this behavior? [/quote] The step move id done through a background PLC and there might be a few reasons for the process not to complete: 1. If there is a fault on the amplifier which PMAC is not aware of (if the amplifier fault is not wired to the controller). 2. The PLC is stopping in the middle of process. Is there any other PLC running on the machine or is there any other device connected to the PMAC which can stop the PLC from running. 3. After the move, the gathered data should be uploaded to the PC, if this fails also the software assumes the process was not complete. Most likely the problem is Number 2, but to double check, on PEWIN32PRO2, open the "view Motion Program/PLC status" from "View" Menu and while the test in Tuning program is going on Monitor the status of PLC 30 and PLC31, and also other PLCs and see if you notice anything irregular.
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This can happen "mostly" with analog (+/-10V) systems if the DAC offsets are not well balanced and/or weak proportional gain. The motor moves the load in one direction and fails to perform in the opposite direction (is the fatal following error Ixx11 set to zero?). The data gather and plot will then timeout and ignore the gathered data. Try increasing the step time and gains.
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