
B-65150E/04 4. SERVO FUNCTION DETAILS
− 121 −
(4) Proper use of the observer and torque command filter
The torque command filter is set in the forward direction. Therefore,
there are fewer bad influences exerted upon the entire velocity control
system than the observer that filters a feedback signal. If the resonance
is very strong and it cannot be eliminated, use the observer.
Use the torque command filter first when the mechanical system
resonates at high frequency. If the resonance cannot be eliminated, use
the observer.
(5) Setting parameters
1895 8x67 Torque command filter (FILTER)
2067 1067
[Setting value] 1166 (200 Hz) to 2327 (90 Hz)
When changing the torque command filter setting, see Table 4.5.3.
As the cut-off frequency, select the parameter value corresponding to a
half of the vibration frequency from the table below.
(Example)
In the case of 200-Hz vibration, select a cutoff frequency of 100
Hz for the torque command filter, and set FILTER = 2185.
Table 4.5.3 Parameter setting value of torque command filter
Cutoff frequency
(Hz)
Parameter
Cutoff frequency
(Hz)
Parameter
60
65
70
75
80
85
90
95
100
110
120
130
2810
2723
2638
2557
2478
2401
2327
2255
2185
2052
1927
1810
140
150
160
170
180
190
200
220
240
260
280
300
1700
1596
1499
1408
1322
1241
1166
1028
907
800
705
622
CAUTION
Do not specify 2400 or a greater value. Such a high
value may increase the vibration.