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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 Frequency response measurement
10.5.1 Measurement of torque control loop
The torque control loop need only be measured for diagnostic purposes in the
event of an error or in cases where no standard data are available for the motor/
power section combination used, resulting in unsatisfactory speed controller
frequency responses.
Note
The user must take special safety precautions before measuring the torque
control loop for vertical axes that have no external weight compensation (drive
must be securely clamped).
1. Set the traversing range monitoring function and enabling logic in the basic
display.
2. Set the necessary parameters in the measuring parameter display
3. Display the results of the measurement on the screen with softkey Display
Fig. 10-1 Display diagram: Example of current control loop
Amplitude
This parameter determines the magnitude of the test signal amplitude (unit:
peak torque specified in %). Values between 1% and 5% are suitable.
Functionality
Procedure
Measurement
parameter
10 Drive Optimization with Start-Up Tool
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