Finding:
After lots of testing, the condition that indicated my 4328 Servo tracking error source is actually the rotary position of the encoder when coupled to the motor.
As a last ditch effort in testing to allow jogging without the fault, I loosened the encoder screws and rotated the encoder to the limits of the space in the bolt holes. The result was improvement to an intermittant fault occurring less often and after only some movements. Removing the bolts and rotating the encoder another "degree" (?), resulted in full operation without fault. I have it temporily held to allow full testing until a fix is completed
It is assumed that the timing between the motor and encoder is critical and that I have somehow rotated the rectangular coupling flange on the motor shaft, or the encoder shaft and that the "alignment" or timing is now off ( by perhaps a degree). I have not yet gone into the coupling to see if I can resolve or reset it to the needed position.
I haven't devised a way to move it precisely and/or easily in terms of how much to turn it or even how it's attached, ( via setscrew or press fit or even keyed?).
Perhaps there is a software adjustment to tune the motor to the encoder? making physical adjustment un-neccessary?
Thank You
Scott