Mitsubishi Electric MELSERVO-J3 Series Instruction Manual page 350

10. SPECIAL ADJUSTMENT FUNCTIONS
POINT
When vibrations in the machine side are not transmitted to the motor side, no
effect is obtained from setting the vibration frequency in the motor side.
When the anti-resonance frequency and resonance frequency can be
confirmed using the machine analyzer or external device, do not set the same
value but set different values to improve the vibration suppression
performance.
A vibration suppression control effect is not produced if the relationship
between the model loop gain (parameter No.PB07) value and vibration
frequency is as indicated below. Make setting after decreasing model loop
gain (PG1), e.g. reduce the response setting.
1
(1.5 PG1) vibration frequency
2
10 - 9