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10.5 Frequency response measurement
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 Siemens AG 2000 All Rights Reserved
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
10.5.3 Measurement of position control loop
This measurement function basically analyzes the response to the position
measuring system. If the function is activated for a spindle without a position
measuring system, the NCK generates an error message. Depending on which
basic measurement setting has been selected, various measurement parame-
ters lists as described below are made available.
1. Set the traversing range monitoring function and enabling logic in the basic
display.
One of three different types of measurement can be selected:
S Reference frequency response
S Setpoint step change
S Setpoint ramp
2. Set the necessary parameters in the measuring parameter display
3. Display the results of the measurement on the screen with softkey Display
Fig. 10-4 Display diagram: Example of position control loop
The reference frequency response measurement determines the response of
the position controller in the frequency range (active position measuring sys-
tem). The setpoint filters, K
v
value and feedforward control must be parameter-
ized such that resonance is avoided wherever possible over the entire fre-
quency range. In the case of dips in the frequency response, the setting of the
feedforward control balancing filters should be checked. Excessive resonance
requires
1. Decrease of the K
v
value
2. Decrease of the feedforward control value
3. Use of setpoint filters
Functionality
Procedure
Reference
frequency
response
10 Drive Optimization with Start-Up Tool
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