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10.5 Frequency response measurement
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SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
Bandwidth
Analyzed frequency range
S 4.0 kHz at 840D, double axis module (sampling rate 16.0 kHz).
S 0.8 kHz on the 840D (sampling rate 16.0 kHz).
Averaging operations
The accuracy of the measurement, but also the measurement time, are in-
creased with this value. A value of 20 is normally suitable.
Settling time
This value represents the delay between recording of the measured data and
injection of the test setpoint and offset. A value of approximately 10 ms is rec-
ommended.
The measuring parameters and the results of the measurement (diagrams) can
be loaded and saved with softkey File functions.
10.5.2 Measurement of speed control loop
This measurement function basically analyzes the response to the motor mea-
suring system. Depending on which basic measurement setting has been se-
lected, various measurement parameters lists as described below are made
available.
The traversing range monitoring function is set and the enabling logic (external/
internal) selected in the basic display.
1. Set the traversing range monitoring function and enabling logic in the basic
display.
Four different types of measurement are available for testing the speed con-
trol loop:
S Reference frequency response
S Interference frequency response
S Setpoint step change
S Disturbance step change
2. Set the necessary parameters in the measuring parameter display
3. Display the results of the measurement on the screen with softkey Display
Additional
information
Functionality
Procedure
10 Drive Optimization with Start-Up Tool
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