7. SPECIAL ADJUSTMENT FUNCTIONS
7 - 1
7. SPECIAL ADJUSTMENT FUNCTIONS
POINT
The functions given in this chapter need not be used normally. Use them if you
are not satisfied with the machine status after making adjustment in the methods
in chapter 6.
7.1 Filter setting
The following filters are available with MR-JE servo amplifiers.
Command
pulse train
Command
filter
Low-pass
filter
setting
Encoder
Servo motor
PWM
M
Load
[Pr. PB18]
+
-
Machine
resonance
suppression
filter 1
[Pr. PB13] [Pr. PB15] [Pr. PB46]
Machine
resonance
suppression
filter 2
Machine
resonance
suppression
filter 3
Machine
resonance
suppression
filter 4
Machine
resonance
suppression
filter 5
Shaft
resonance
suppression
filter
Robust filter
[Pr. PB48]
[Pr. PB50]
[Pr. PB17]
Speed
control
[Pr. PB49] [Pr. PE41]
7.1.1 Machine resonance suppression filter
POINT
The machine resonance suppression filter is a delay factor for the servo system.
Therefore, vibration may increase if you set an incorrect resonance frequency or
set notch characteristics too deep or too wide.
If the frequency of machine resonance is unknown, decrease the notch
frequency from higher to lower ones in order. The optimum notch frequency is
set at the point where vibration is minimal.
A deeper notch has a higher effect on machine resonance suppression but
increases a phase delay and may increase vibration.
A wider notch has a higher effect on machine resonance suppression but
increases a phase delay and may increase vibration.
The machine characteristic can be grasped beforehand by the machine analyzer
on MR Configurator2. This allows the required notch frequency and notch
characteristics to be determined.
If a mechanical system has a unique resonance point, increasing the servo system response level may
cause resonance (vibration or unusual noise) in the mechanical system at that resonance frequency. Using
the machine resonance suppression filter and adaptive tuning can suppress the resonance of the
mechanical system. The setting range is 10 Hz to 4500 Hz.
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