Special Adjustment Functions; Function Block Diagram; Machine Resonance Suppression Filter - Mitsubishi Electric MR-J2S B Series Instruction Manual

7. SPECIAL ADJUSTMENT FUNCTIONS

7. SPECIAL ADJUSTMENT FUNCTIONS
If a mechanical system has a natural resonance point, increasing the servo system response level may
cause the mechanical system to produce resonance (vibration or unusual noise) at that resonance
frequency.
Using the machine resonance suppression filter and adaptive vibration suppression control functions can
suppress the resonance of the mechanical system.

7.1 Function block diagram

Speed
control
Machine resonance
suppression filter 1
Adaptive vibration
suppression control

7.2 Machine resonance suppression filter

(1) Function
The machine resonance suppression filter is a filter function (notch filter) which decreases the gain of
the specific frequency to suppress the resonance of the mechanical system. You can set the gain
decreasing frequency (notch frequency) and gain decreasing depth.
POINT
The functions given in this chapter need not be used generally. Use them if
you are not satisfied with the machine status after making adjustment in
the methods in chapter 6.
Parameter
Parameter
No.18 No.25
00
0
except
00
1 or 2
Mechanical
system
response
level
Notch
depth
Notch frequency
POINT
The machine resonance suppression filter is a delay factor for the servo
system. Hence, vibration may increase if you set a wrong resonance
frequency or a too deep notch.
Low-pass
filter
Machine resonance point
Frequency
Frequency
7 - 1
Current
Parameter
command
No.25
0
Servo
motor
1
Encoder