Mitsubishi Electric MELSERVO-JN Series - 7.2 Machine resonance suppression function; 7.2.1 Function block diagram; 7.2.2 Adaptive filter II

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7. SPECIAL ADJUSTMENT FUNCTIONS
7.2 Machine resonance suppression function
POINT
The functions given in this section are not generally required to use. Use these
functions when the machine status is not satisfactory after making adjustment in
the methods given in chapter 6.
If a mechanical system has a natural resonance point, increasing the servo system response level may cause
the mechanical system to produce resonance (vibration or unusual noise) at that resonance frequency.
Using the machine resonance suppression filter and adaptive tuning can suppress the resonance of the
mechanical system.
7.2.1 Function block diagram
Speed control
Machine
resonance
suppression
filter 2
Parameter
No.PB01
Manual mode
Machine resonance
suppression filter 1
2
0
Encoder
Current
command
Low-pass filter
M
Servo
motor
Manual setting
Automatic setting
Machine
resonance
suppression
filter 3
Parameter
No.PB16
0
1
0
Parameter
No.PB39
1
Parameter
No.PB23
1
0
7.2.2 Adaptive filter II
(1) Function
The adaptive filter II (adaptive tuning) sets the filter characteristics automatically with the one-touch tuning,
and suppresses vibrations of the mechanical system. Since the filter characteristics (frequency, depth) are
set automatically, you need not be conscious of the resonance frequency of a mechanical system.
Mechanical
system
response
level
Machine resonance point
Notch frequency
Frequency
Notch frequency
Frequency
Frequency
Mechanical
system
response
level
Machine resonance point
Frequency
Notch
depth
Notch
depth
When machine resonance is large and frequency is low When machine resonance is small and frequency is high