Mitsubishi Electric MELSERVO-J4 series, Instruction Manual

Page: 259 / 646

7 SPECIAL ADJUSTMENT FUNCTIONS
7.1 Filter setting
257
7
• When vibration can be confirmed using monitor signal or external sensor
3.
Fine-adjust "Vibration suppression control - Vibration frequency damping" and "Vibration suppression control -
Resonance frequency damping".
Command notch filter
• By using the advanced vibration suppression control

and the command notch filter, the load-side vibration
of three frequencies can be suppressed.
• The frequency range of machine vibration, which can be supported by the command notch filter, is between
4.5 Hz and 2250 Hz. Set a frequency close to the machine vibration frequency and within the range.
• When [Pr. PB45 Command notch filter] is changed during the positioning operation, the changed setting is
not reflected. The setting is reflected approximately 150 ms after the servo motor stops (after servo-lock).
Function
Command notch filter has a function that lowers the gain of the specified frequency contained in a position command. By
lowering the gain, load-side vibration, such as work-side vibration and base shake, can be suppressed. Which frequency to
lower the gain and how deep to lower the gain can be set.
t
Motor-side vibration
(droop pulses)
Position command frequency
t
External acceleration pickup signal, etc.
Vibration suppression control -
Vibration frequency
Vibration suppression control -
Resonance frequency
Set the same value.
Vibration cycle [Hz] Vibration cycle [Hz]
Command notch filter: disabled Command notch filter: enabled
Position
Load side
t
Load side
t
Position