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Chapter 10 Adjustment
10–11
(1) Machine resonance suppression filter
The machine resonance suppression filter will function at the set frequency. Use the D/A output
function to output the current feedback and measure the resonance frequency. Note that the
resonance frequency that can be measured is 0 to 500 Hz. For resonance exceeding 500 Hz,
directly measure the phase current with a current probe, etc.
When the machine resonance suppression filter is set, vibration may occur at a separate
resonance frequency that existed latently at first. In this case, the servo control is stabilized when
the machine resonance suppression filter depth is adjusted and the filter is adjusted so as not to
operate more than required.
<Setting method>
1. Set the resonance frequency in the machine resonance suppression filter frequency (SV038:
FHz1, SV046: FHz2).
2. If the machine starts to vibrate at another frequency, raise (make shallower) the machine
resonance suppression filter depth compensation value (SV033: SSF2.nfd), and adjust to the
optimum value at which the resonance can be eliminated.
3. When the vibration cannot be completely eliminated, use another vibration suppression
control (jitter compensation, adaptive filter) in combination with the machine resonance
suppression filter.
No. Abbrev. Parameter name Unit Explanation Setting range
SV038 FHz1 Machine resonance
suppression filter center
frequency 1
Hz Set the resonance frequency to be suppressed. (Valid at
36 or more).
Set 0 when the filter is not to be used.
0 to 9000
(Hz)
SV046 FHz2 Machine resonance
suppression filter center
frequency 2
Hz Set the resonance frequency to be suppressed. (Valid at
36 or more).
Set 0 when the filter is not to be used.
0 to 9000
(Hz)
SV033 SSF2 Special servo function
selection 2
The machine resonance suppression filter depth compensation is set with the
following parameters.
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
dos dis nfd2 nfd3 nfd1 zck
bit Explanation
0
to
3
nfd1
Set the filter depth for the 1st machine resonance suppression
filter.
The control stability can be improved by setting amount equivalent
to the resonance elimination amount.
Deeper ← → Shallower
Setting value 000 001 010 011 100 101 110 111
Depth (dB) −∞ −18 −12 −9 −6 −4 −3 −1
4 nfd3
The 3rd machine resonance suppression filter is validated. (Center
frequency 1125Hz)
5
to
7
nfd2
Set the filter depth for the 2nd machine resonance suppression
filter.
The control stability can be improved by setting amount equivalent
to the resonance elimination amount.
Deeper ← → Shallower
Setting value 000 001 010 011 100 101 110 111
Depth (dB) −∞ −18 −12 −9 −6 −4 −3 −1