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7. SPECIAL ADJUSTMENT FUNCTIONS
(2) Parameters
The operation of adaptive vibration suppression control selection (DRU parameter No.25).
DRU 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 o
f
machine resonance is stopped.
POINT
Adaptive vibration suppression control is factory-set to be "invalid" (DRU
parameter No. 25: 0000).
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 level 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 (DRU parameter No.25).
DRU 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.