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TI71M01D06-01EN 3rd Edition: 2012.12.01
7.4 How to Use the FFT Function
7.4.1 Overview
The FFT function allows measuring the loop transfer characteristics of a velocity control loop.
These measurement values can be used as reference data when tuning the servo. This
function is included in the utility software version 1.03.03 or later.
7.4.2 Measurement Procedure
Step 1 Select [Servo Tuning] from [#parameter].
Step 2 Set 1 [Hz] for #8 [Position control bandwidth 1].
Step 3 Click [FFT] to open the FFT dialog box.
Step 4 Turn the servo on from the Operation window if the servo is turned off.
Step 5 Click [Start measurement].
* The amplitude fluctuates depending on the load conditions. If the amplitude
cannot be displayed at several Hz, make the input signal larger and adjust such
that the amplitude becomes several degrees.
The motor moves several degrees during the FFT measurement. Please exercise sufficient
caution at the start of this operation.
Step 6
Open the ”FFT” dialog box
Step 8
Click [Start measurement]
WARNING