
B-65150E/04 3. α SERIES PARAMETER ADJUSTMENT
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(Adjustment procedure)
• Operate the machine at a relatively low feedrate (F1000 to
F10000).
• Increase the velocity loop gain gradually until a slight
vibration sound occurs at feed time. If an excessively large
velocity loop gain is set at this time, vibration of low
frequencies within 200 Hz becomes dominant, disabling the
observation of high-frequency vibration that occurs first. If
vibration of a high frequency cannot be observed, the
vibration suppression filter cannot be used.
• After setting a velocity loop gain that generates a slight
vibration sound, observe the TCMD to measure the
frequency.
• Set the measured frequency in the parameters described
below.
[Parameters for setting the vibration suppression filter]
No. 2113 (Series 16), No. 1706 (Series 15)
Attenuation center frequency (Hz): Set the
resonance frequency of the machine.
No. 2117 (Series 16), No. 2620 (Series 15)
Attenuation bandwidth: 30 (40 when the center
frequency is 600 Hz or more)
Fig. 3.4.1 (e) Effect of a vibration suppression filter (torque command waveform)
<3> Velocity loop gain setting
Adjust the velocity loop gain according to Subsec. 3.3.1, "Gain
Adjustment Procedure."
[Parameters for velocity loop gain adjustment]
No. 2017 (Series 16), No. 1959 (Series 15), B7:
1 (Enables the velocity loop proportional high-
speed processing function.)
Velocity gain (gain on the servo adjustment screen):
Increase the velocity gain gradually starting at
about 400%. The target is about 1000%.
Resonance frequency:
500 Hz
Before a vibration
suppression filter is used
Velocity gain: 600%
After a vibration
suppression filter is used
Velocity gain: 800%
(× 10 Hz) (× 10 Hz)