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8. SPECIAL ADJUSTMENT FUNCTIONS
8. SPECIAL ADJUSTMENT FUNCTIONS
POINT
The functions given in this chapter need not be used generally. Use them if you
are not satisfied with the machine status after making adjustment in the methods
in chapter 7.
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.
8.1 Function block diagram
0
1
Speed
control
Low-pass
filter
Parameter
No.PB23
0
1
Automatic setting
Manual
setting
Machine resonance
suppression filter 2
Parameter
No.PB16
Parameter
No.PB01
Filter tuning
mode
Manual mode
Machine resonance
suppression filter 1
2
1
0
M
Servo
motor
Current
command
Encoder
8.2 Adaptive filter
(1) Function
Adaptive filter
(adaptive tuning) is a function in which the servo amplifier detects machine vibration for a
predetermined period of time and sets the filter characteristics automatically to suppress mechanical
system vibration. 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
Frequency
Notch
depth
Notch frequency
Frequency
Mechanical
system
response
level
Machine resonance point
Frequency
Notch
depth
Notch frequency
Frequency
When machine resonance is large and
frequency is low
When machine resonance is small and
frequency is high