Mitsubishi Electric MR-J4-10B(-RJ) Instruction Manual page 572

17. APPLICATION OF FUNCTIONS
(5) Filter setting
The following filters are available with the J3 extension function.
+
Command Command
filter
pulse train -
(a) Machine resonance suppression filter
If a mechanical system has a unique resonance point, increasing the servo system response level
may cause resonance (vibration or unusual noise) in the mechanical system at that resonance
frequency. Using the machine resonance suppression filter and adaptive tuning can suppress the
resonance of the mechanical system. The setting range is 10 Hz to 4500 Hz.
Speed
[Pr. PB18]
control
Low-pass
filter
setting
[Pr. PX19]
[Pr. PX20]
Machine
resonance
suppression
filter 4
[Pr. PB17]
Shaft
resonance
suppression
filter
POINT
The machine resonance suppression filter is a delay factor for the servo system.
Therefore, vibration may increase if you set an incorrect resonance frequency or
set notch characteristics too deep or too wide.
If the frequency of machine resonance is unknown, decrease the notch
frequency from higher to lower ones in order. The optimum notch frequency is
set at the point where vibration is minimal.
A deeper notch has a higher effect on machine resonance suppression but
increases a phase delay and may increase vibration.
A wider notch has a higher effect on machine resonance suppression but
increases a phase delay and may increase vibration.
The machine characteristic can be grasped beforehand by the machine analyzer
on MR Configurator2. This allows the required notch frequency and notch
characteristics to be determined.
[Pr. PB13] [Pr. PB15]
Machine Machine
resonance resonance
suppression suppression
filter 1 filter 2
[Pr. PX21]
[Pr. PX31]
Machine
resonance
suppression
filter 5
Robust filter
17 - 41
[Pr. PX17]
Machine
resonance
suppression
filter 3
Load
M
PWM
Servo motor
Encoder