Low-Pass Filter; Gain Changing Function; Applications - Mitsubishi Electric Melservo MR-J3-A Instruction Manual

8. SPECIAL ADJUSTMENT FUNCTIONS

8.5 Low-pass filter

(1) Function
When a ballscrew 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:
When parameter No. PB23 is set to "
(2) Parameter
Set the operation of the low-pass filter selection (parameter No. PB23.)

8.6 Gain changing function

This function can change the gains. You can change between gains during rotation and gains during stop or
can use an external signal to change gains during operation.

8.6.1 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 using an external signal 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).
Filter frequency(rad/s)
1
Parameter No. PB23
Low-pass filter selection
0: Automatic setting (initial value)
1: Manual setting (parameter No. PB18 setting)
VG2
1 + GD2
", manual setting can be made with parameter No. PB18.
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