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7 - 2 7. SPECIAL ADJUSTMENT FUNCTIONS (2) Parameters The operation of adaptive tuning mode (parameter No.PB01). Filter tunin g mode selection 000 Parameter No.PB01 Setting Filter adjustment mode Automatically set paramet…

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7. SPECIAL ADJUSTMENT FUNCTIONS
7. 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.
7.1 Function block diagram
Parameter
No.PB23
Parameter
No.PB16
Parameter
No.PB01
Adaptive tuning
Manual setting
Speed
control
Machine resonance
suppression filter 2
Encoder
Current
command
Low-pass
filter
Servo
motor
Machine resonance
suppression filter
1
7.2 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
Mechanical
system
response
level
Machine resonance point
Machine resonance point
Frequency Frequency
Notch
depth
Notch
depth
Notch frequency Notch frequency
Frequency Frequency
When machine resonance is large and frequency is low When machine resonance is small and frequency is high
POINT
The machine resonance frequency which adaptive tuning mode can respond
to is about 100 to 2.25kHz. Adaptive vibration suppression control has no
effect on the resonance frequency outside this range.
Adaptive vibration suppression control may provide no effect on a mechanical
system which has complex resonance characteristics.
7 - 2
7. SPECIAL ADJUSTMENT FUNCTIONS
(2) Parameters
The operation of adaptive tuning mode (parameter No.PB01).
Filter tuning mode selection
000
Parameter No.PB01
Setting Filter adjustment mode Automatically set parameter
0 Filter OFF (Note)
1 Filter tuning mode
Parameter No.PB13
Parameter No.PB14
2 Manual mode
Note. Parameter No.PB19 and PB20 are fixed to the initial values.
7 - 3
7. SPECIAL ADJUSTMENT FUNCTIONS
(3) Adaptive tuning mode procedure
The response has increased to the
machine limit.
The machine is too complicated to
provide the optimum filter.
Factor
Adaptive tuning adjustment
Operation
Is the target response
reached?
Tuning ends automatically after the
predetermined period of time.
(Parameter No.PB01 turns to "0002"
or "0000".)
Decrease the response until vibration
or unusual noise is resolved.
End
Yes
No
No
Yes
Increase the response setting.
Has vibration or unusual noise
occurred?
Has vibration or unusual noise
been resolved?
Using the machine analyzer, set the
filter manually.
Yes
No
Execute or re-execute adaptive
tuning. (Set parameter No.PB01 to
"0001".)
If assumption fails after tuning is executed at
a large vibration or oscillation, decrease the
response setting temporarily down to the
vibration level and execute again.