Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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10 - 10
10. SPECIAL ADJUSTMENT FUNCTIONS
10.5 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 enabled for a torque command as default.
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
However, when the automatically adjusted value is smaller than VG2, the filter frequency will be the VG2
value.
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.)
0 0 0
Parameter No.PB23
Low-pass filter selection
0: Automatic setting (initial value)
1: Manual setting (parameter No.PB18 setting)
10.6 Gain switching function
This function can change the gains. You can change between gains during rotation and gains during stop or
can use an input device to change gains during operation.
10.6.1 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 input device 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).