Mitsubishi Electric MELDAS MDS-B Series Instruction Manual page 122

(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
SV038 FHz1 Machine resonance
suppression filter center
frequency 1
SV046 FHz2 Machine resonance
suppression filter center
frequency 2
SV033 SSF2 Special servo function
selection 2
Chapter 10 Adjustment
Unit
Hz Set the resonance frequency to be suppressed. (Valid at
36 or more).
Set 0 when the filter is not to be used.
Hz Set the resonance frequency to be suppressed. (Valid at
36 or more).
Set 0 when the filter is not to be used.
The machine resonance suppression filter depth compensation is set with the
following parameters.
15 14 13 12 11 10
dos
bit
Set the filter depth for the 1st machine resonance suppression
filter.
The control stability can be improved by setting amount equivalent
0
to the resonance elimination amount.
to nfd1
Deeper ←
3
Setting value 000
Depth (dB)
The 3rd machine resonance suppression filter is validated. (Center
4 nfd3
frequency 1125Hz)
Set the filter depth for the 2nd machine resonance suppression
filter.
The control stability can be improved by setting amount equivalent
5
to the resonance elimination amount.
to nfd2
Deeper ←
7
Setting value 000
Depth (dB)
10–11
Explanation
9 8 7 6 5
dis nfd2
Explanation
001 010 011 100
−∞ −18 −12 −9 −6
001 010 011 100
−∞ −18 −12 −9 −6
Setting range
0 to 9000
(Hz)
0 to 9000
(Hz)
4 3 2 1 0
nfd3 nfd1 zck
→ Shallower
101 110 111
−4 −3 −1
→ Shallower
101 110 111
−4 −3 −1