Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 134 / 500

7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 5
7.4 Low-pass filter
(1) Function
When a ball screw or the like is used, resonance of high frequency may occur as the response level 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(rad/s)
1 + GD2
VG2
10
When parameter No.PB23 is set to " 1 ", manual setting can be made with parameter No.PB18.
(2) Parameter
Set the low-pass filter selection (parameter No.PB23.)
Low-pass filter selection
0: Automatic setting (factory setting)
1: Manual setting (parameter No.PB18 setting)
Parameter No.PB23
7.5 Gain changing function
This function can change the gains. The gains are switched by using the control instruction from the controller or
gain switching conditions (including the servo motor speed).
7.5.1 Applications
This function is used when.
(1) You want to increase the gains during servo lock but decrease the gains to reduce noise during rotation.
(2) You want to increase the gains during settling to shorten the stop settling time.
(3) You want to change the gains by using the control instruction from the controller to ensure stability of the
servo system since the load inertia moment ratio varies greatly during a stop (e.g. a large load is mounted
on a carrier).