10
03/2006
10.1 Overview
10-178
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
Apart from the usual method of optimizing the control loop machine data based
on transient response, i.e. time characteristics, a particularly powerful tool for
assessing the control loop setting is provided in the form of the integrated
Fourier analysis (FFT) function which also be applied to analyze the given
mechanical characteristics. This tool must be used if
S unsteady current, speed or position signal curves indicate problems with
stability.
S only long rise times can be obtained in the speed loop.
The circularity test is used to analyze the contour accuracy at the quadrant tran-
sitions of circular contours achieved by means of friction compensation (con-
ventional or neural quadrant error compensation).
Reference material: /FB3/ K3 Function manual for advanced functions
Compensation, section: Circularity test
The servo trace is used to analyze the changes over time in servo and drive
data with the aid of graphs. For example:
S Actual position value
S Position setpoint
S Following error
S Contour deviation
Saving measurement resultsThe measurement diagrams can be archived via
file functions, allowing machine settings to be documented and facilitating re-
mote diagnostics.
FFT analysis
(Fourier analysis)
Circularity test
Servo trace
Saving
measurement
results
10 Drive O
timization
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