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7. SPECIAL ADJUSTMENT FUNCTIONS
(2) Parameters
The operation of adaptive vibration suppression control selection (parameter No.25).
00
Parameter No. 25
Adaptive vibration suppression control selection
0: Invalid
1: Valid
Machine resonance frequency is always detected to
generate the filter in response to resonance, suppressing
machine vibration.
2: Held
Adaptive vibration suppression control sensitivity selection
Set the sensitivity of detecting machine resonance.
0: Normal
1: Large sensitivity
Filter characteristics generated so far is held, and detection of
machine resonance is stopped.
POINT
Adaptive vibration suppression control is factory-set to be "invalid"
(parameter No. 25: 0000).
The filter characteristics generated are saved in the motion controller every
10s since power-on. At next power-on, vibration suppression control is
performed with this data saved in the motion controller being used as an
initial value.
Selection the adaptive vibration suppression control sensitivity can change
the sensitivity of detecting machine resonance. Selection of "large
sensitivity" detects smaller machine resonance and generates a filter to
suppress machine vibration. However, since a phase delay will also
increase, the response of the servo system may not increase.
7.4 Low-pass filter
(1) Function
When a ballscrew or the like is used, resonance of high frequency may occur as the response of the
servo system is increased. To prevent this, the low-pass filter is factory-set to be valid for a torque
command. The filter frequency of this low-pass filter is automatically adjusted to the value in the
following expression:
Filter frequency
(Hz)
Speed control gain 2 set value
10
(1 ratio of load inertia moment to servo motor inertia moment set value 0.1)
2
(2) Parameter
Set the operation of the low-pass filter (parameter No.25).
0
Parameter No. 25
Low-pass filter selection
0: Valid (automatic adjustment) initial value
1: Invalid
POINT
In a mechanical system where rigidity is extremely high and resonance is
difficult to occur, setting the low-pass filter to be "invalid" may increase
the servo system response to shorten the settling time.