February 2012 6 – 67
6.8 Finding position differences of direct and indirect encoders
This procedure serves to compare the signals of the motor encoder to those of the position encoder.
This allows to draw conclusions about the quality of the mechanics and the coupling system.
Prerequisite The machine tool to be investigated must be equipped with digital drives and direct encoders (dual
encoder system).
These instructions do not apply for digital axes with linear motors.
Integrated
oscilloscope
The integrated oscilloscope features the Pos. Diff. signal (difference between position and speed
encoder in mm).
Activation and operation --> See ”Integrated oscilloscope” on page 10 – 95.
An example of recording a position difference:
8 Make the following settings:
8 Use an NC program which moves the X axis back and forth several times.
(Ask the machine operator.)
8 Start the NC program and start oscilloscope recording.
8 Stop recording and adjust the signals.
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