Mitsubishi Electric MELDAS MDS-R Series Specifications And Instruction Manual page 199

<Setting the machine resonance filter frequency when resonance cannot be eliminated>
This function is compatible with the MDS-R-V1/V2 Series' machine resonance suppression filter
(SV038: FHz1, SV046: FHz2). Some machines have three or more machine resonance points and
the resonance cannot be eliminated. Try the following methods in this case.
(a) When there are three machine resonance points including one exceeding 800Hz
(b) When there are three or more machine resonance points
(c) When machine resonance does not change even when machine resonance filter is set
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When the 3rd machine resonance filter is set (SV033: nfd3),
the resonance filter is applied at 1125Hz, and the machine may
not resonate at 800Hz or more. Then, remove the remaining
two machine resonance with the 1st and 2nd machine
resonance suppression filters.
If the machine resonance cannot be eliminated even by setting
the 1st and 2nd machine resonance suppression filter
frequencies, it may be possible to suppress the machine
resonance by additionally setting the 3rd machine resonance
suppression filter.
[Example] If the machine resonance is approx. 1100Hz and high, validate the 3rd machine
resonance suppression filter. Then, adjust the machine resonance suppression
filters (SV038: FHz1, SV046: FHz2).
With the MDS-R-V1/V2
suppression filter, the filter is also applied at the odd-fold of the
set frequency. If one machine resonance is near the odd-fold
of another machine resonance, set the machine resonance
suppression filter frequency to the lower resonance, and try
changing it by approx. 10 to 20Hz. It may be possible to
eliminate two machine resonance by setting the most effective
value.
[Example] If the machine resonates at 300Hz and 900Hz,
both machine resonance can be eliminated by
setting 300Hz.
The MDS-R-V1/V2 Series machine resonance suppression filter frequency can be set by 1Hz.
However, the internal control is operated with the nearest value of the frequency setting range
obtained by the following expression.
Frequency setting range (Hz)=4500/N (N: integer)
If the value of the above expression is not the frequency to be set, set a frequency that is 1
part of the odd amount (1/3, etc.). Doing so may be possible to eliminate the machine
resonance.
[Example] To set 1350Hz, setting 450Hz may be just as effective.
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9. Adjustment
Series machine resonance
9 - 14
Machine resonance filter
800Hz 1125Hz 1450Hz
Machine resonance
300Hz 900Hz 1500Hz
Machine resonance filter
Set 300Hz to suppress the
machine resonance near 900Hz.