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4. Servo Adjustment
4 - 12
(1) Notch filter
This servo drive unit mounts 5 notch filters. Measure the resonance frequency with the current
feedback analog output function, and set that frequency in parameter.
However, if the notch filter is set to a particularly low frequency, another resonance frequency that
did not vibrate initially may occur. If the notch filter's depth compensation (SV033, nfd1, nfd2) is
adjusted so that the filter does not operate unless necessary, the servo control will be stabilized.
Notch filter 3 is a filter with frequency fixed to 1125Hz, and has no depth compensation.
<Setting method>
[1] Set the resonance frequency in the notch filter frequency (1, 2, 4, 5).
[2] If the machine starts to vibrate at another frequency, raise (make shallower) the notch filter
depth compensation value, and adjust to the optimum value at which the resonance can be
eliminated.
[3] When the vibration cannot be completely eliminated, use also another notch filter for this
frequency.
No. Abbrev. Parameter name Explanation Setting range
FEDCBA98765 4 3 2 10
hvx svx nfd2 nf3 nfd1 zck
bit Meaning when "0" is set Meaning when "1" is set
1 Set the filter depth for Notch filter 1 (SV038).
2 nfd1 Value 000 001 010 011 100 101 110 111
3
Depth (dB)
DeepÅ
Infntly
deep
-18.1 -12.0 -8.5 -6.0 -4.1 -2.5 -1.2
ShallowÆ
4 nf3 Notch filter 3 stop Notch filter 3 start (1125Hz)
5 Set the filter depth of Notch filter 2 (SV046).
6 nfd2 Value 000 001 010 011 100 101 110 111
SV033 SSF2
Servo function
selection 2
7
Depth (dB)
DeepÅ
Infntly
deep
-18.1 -12.0 -8.5 -6.0 -4.1 -2.5 -1.2
ShallowÆ
SV038 FHz1
Notch filter frequency
1
Set the vibration frequency to suppress if machine vibration occurs.
(Valid at 36 or more) When not using, set to "0".
0 to 9000
(Hz)
SV046 FHz2
Notch filter frequency
2
Set the vibration frequency to suppress if machine vibration occurs.
(Valid at 36 or more) When not using, set to "0".
0 to 9000
(Hz)
FEDCBA98765 4 3 2 10
hvx svx nfd2 nf3 nfd1 zck
bit Meaning when "0" is set Meaning when "1" is set
1 Set the filter depth for Notch filter 4 (SV038).
2 nfd4 Value 000 001 010 011 100 101 110 111
3
Depth (dB)
DeepÅ
-
∞
-18.1 -12.0 -8.5 -6.0 -4.1 -2.5 -1.2
ShallowÆ
5 Set the filter depth for Notch filter 5 (SV046).
6 nfd5 Value 000 001 010 011 100 101 110 111
SV083 SSF6
Servo function
selection 6
7
Depth (dB)
DeepÅ
-∞
-18.1 -12.0 -8.5 -6.0 -4.1 -2.5 -1.2
ShallowÆ
SV087 FHz4
Notch filter
frequency 4
0 to 2250
(Hz)
SV088 FHz5
Notch filter
frequency 5
Set the vibration frequency to suppress if machine vibration occurs.
(Valid at 141 or more) When not using, set to "0".
To use this function, set to not "0" (normally "1") when turning the power
ON. This function cannot be used with adaptive filter.
0 to 2250
(Hz)