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4.5
Low-pass filter
When a ball screw or the like is used, resonance of a high frequency may occur as the response level of the servo system is
increased. To prevent this, the low-pass filter has been enabled for a torque command as the initial value. Use automatic
setting as normal setup. To increase the responsiveness, set the filter frequency of the low-pass filter manually.
Low-pass filter setting method
Set [Pr. PB23.1 Low-pass filter selection]. When [Pr. PB23.1 Low-pass filter selection] is set to "1" (manual setting), the filter
frequency can be set through [Pr. PB18 Low-pass filter setting].
Servo parameter
Description
PB23.1
Low-pass filter selection
0: Automatic setting
1: Manual setting
2: Disable
Operation of low-pass filter
When [Pr. PB23.1 Low-pass filter selection] is set to "0" (automatic setting), the filter frequency is automatically adjusted to the
value of the following equation.
VG2
Filter frequency ([rad/s]) =
1 + GD2
4.6
Robust filter
The robust filter provides both high response and stability to large inertia devices driven by belts and gears, such as printing
and packaging machines, which is difficult to achieve with the conventional control. Greater stability can be achieved by
gradually reducing the torque of the wide frequency range. When the load to motor inertia ratio of a machine is 10 times or
more, use this filter to more increase the response level of the machine.
Robust filter restrictions
Enabling the robust filter disables the machine resonance suppression filter 5.
Robust filter setting method
Set [Pr. PE41.0 Robust filter selection]. The characteristics of the robust filter are calculated automatically from the servo
parameter.
Servo parameter
Description
PE41.0
Robust filter selection
0: Disable
1: Enable
× 10
4 VIBRATION SUPPRESSION FUNCTION
4.5 Low-pass filter
4
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