YASKAWA SGDH User Manual page 538

1. Sufficient precautions must be taken when setting the notch frequency. Do not set the notch filter fre-
IMPORTANT
quency (Pn409) that is close to the speed loop's response frequency. Set the frequency at least four times
higher than the speed loop's response frequency. Setting the notch filter frequency too close to the
response frequency may cause vibration and damage the machine. The speed loop response frequency is
the value of the Speed Loop Gain (Pn100) when the Moment of Inertia Ratio (Pn103) is set to the correct
value.
2. Change the Notch Filter Frequency (Pn409) only when the servomotor is stopped. Vibration may occur if
the notch filter frequency is changed when the servomotor is rotating.
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9.4 Servo Gain Adjustment Functions
9