3.2 Operations
3-91
9
head1
3
Utility Function Mode
3.2.32
EasyFFT (Fn206)
This function sends a frequency waveform reference from the SERVOPACK to the
servomotor and rotates the servomotor at very low speed several times over a certain
period, thus causing machine vibration. The SERVOPACK detects the resonance fre-
quency from the generated vibration and makes notch filter settings according to the
resonance frequency detection. The notch filter is effective for the elimination of
high-frequency vibration and noise.
Execute this function after the servomotor power is turned OFF if operation of the
SERVOPACK results in high-frequency noise and vibration.
(1) Preparation
The following conditions must be met to perform EasyFFT.
• The write prohibited setting (Fn010) must not be set to write-protect parameters.
• The main circuit power supply must be ON.
• All alarms must be cleared.
• The hardwire baseblock (HWBB) must be disabled.
• The servomotor power must be OFF.
• There must be no overtravel.
• The test without a motor function must be disabled (Pn00C.0 = 0).
• An external reference must not be input.
(2) Operating Procedure
Use the following procedure.
WARNING
• The servomotor rotates at very low speed when EasyFFT is executed. Do not
touch the servomotor or machine during execution of EasyFFT, otherwise injury
may result.
CAUTION
• Use the EasyFFT when the servo gain is low, such as in the initial stage of servo
adjustment. If EasyFFT is executed after increasing the gain, the servo system
may vibrate depending on the machine characteristics or gain balance.
Step
Display after Operation
Keys
Operation
1
Press the
Key to view the main
menu for the utility function mode.
Use the
or
Key to move
through the list and select Fn206.
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