Mitsubishi Electric Melservo-J3 Series MR-J3-B Instruction Manual page 164

7. SPECIAL ADJUSTMENT FUNCTIONS
POINT
When machine end vibration does not show up in motor end vibration, the
setting of the motor end vibration frequency does not produce an effect.
When the anti-resonance frequency and resonance frequency can be
confirmed using the machine analyzer or external FFT 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 PG1, e.g.
reduce the response setting.
1
(1.5 PG1) vibration frequency
2
7 - 9