Easy Fft (Fn206) - YASKAWA E-7 Series Operating Manual

3.2 Operating Procedures for Utility Functions

3.2.33 Easy FFT (Fn206)

3.2.33 Easy FFT (Fn206)

You can use this utility function to send a frequency waveform reference
from the SERVOPACK to the Servomotor and operate the Servomotor at
very low speed several times over a certain period to cause machine
vibration. The SERVOPACK detects the resonance frequency from the
generated vibration and makes notch filter settings according to the
detected resonance frequencies. The notch filters are effective for elimi-
nating high-frequency vibration and noise.
Execute this utility function after the Servomotor power is turned OFF if
operation of the SERVOPACK results in high-frequency noise and vibra-
tion.
Preparations
Always check the following before you execute Easy FFT.
• The parameters must not be write-prohibited (Fn010 must be set to
0000).
• The servo must be OFF.
• The servo must be in ready status.
• There must be no overtravel.
• The test without a motor function must be disabled (Pn00C =

n.
• An external reference must not be input.
3-104
0).