Mitsubishi Electronics MDS-D-SVJ3 ユーザーズマニュアル

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The load inertia becomes much smaller than usual if the motor position enters the machine backlash when 

the motor is stopped.

Because this means that an extremely large VGN1 is set for the load inertia, vibration may occur.

Jitter compensation can suppress the vibration that occurs at the motor stop by ignoring the backlash 

amount of speed feedback pulses when the speed feedback polarity changes.

This filter can damp vibrations of servo torque commands at a specified frequency.

Machine vibrations can be suppressed by adjusting the notch filter frequency to the machine's resonance 

frequency.

Filter depth adjustment is also available that allows stable control even when the filter is set to an extremely 

low frequency.

Machine's specific resonance frequency tends to change due to aged deterioration or according to 

machine's operation conditions. Therefore, the frequency may be deviated from the filter frequency set at the 

initial adjustment. With adaptive tracking-type notch filter, resonance point fluctuation due to the machine's 

condition change is estimated using the vibration components of the current commands, and effective notch 

filter frequency, which has been deviated from the setting value, is automatically corrected to suppress the 

resonance.

Notch filter 1

50Hz to 2250Hz

Enabled

Notch filter 2

50Hz to 2250Hz

Enabled

Notch filter 3

Fixed at 1125Hz

Disabled

Notch filter 4

50Hz to 2250Hz

Enabled

Notch filter 5

50Hz to 2250Hz

Enabled

+20

-20

-40

0

+20

-20

-40

0

10

30

50 70 100

300 500 700 1k

10

30

50 70 100

300 500 700 1k

Gain

[dB]

Gain

[dB]

Frequency 

[Hz]

Frequency 

[Hz]

Example of filter characteristic set to 300Hz

For shallow setting by additionally using the depth compensation at 300Hz