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7. SPECIAL ADJUSTMENT FUNCTIONS
7. SPECIAL ADJUSTMENT FUNCTIONS
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.
If a mechanical system has a natural resonance level point, increasing the servo system response 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
Encoder
Current
command
Low-pass
filter
Machine resonance
suppression filter 1
Adaptive vibration
suppression control
00
or1 2
0
0
1
00
except
Servo
motor
DRU parameter
No.18
DRU parameter
No.25
DRU parameter
No.25
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.
Mechanical
system
response
level
Machine resonance point
Frequency
Notch
depth
Notch frequency
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.