Mitsubishi Electronics MR-J2S- B User Manual

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7. SPECIAL ADJUSTMENT FUNCTIONS

7. SPECIAL ADJUSTMENT FUNCTIONS

POINT
The functions given in this chapter need not be used generally. Use them if
you are not satisfied with the machine status after making adjustment in
the methods in chapter 6.

If a mechanical system has a natural resonance point, increasing the servo system response level may
cause the mechanical system to produce resonance (vibration or unusual noise) at that resonance
frequency.
Using the machine resonance suppression filter and adaptive vibration suppression control functions can
suppress the resonance of the mechanical system.

7.1 Function block diagram

Speed
control

Encoder

Current 

command

Low-pass

filter

Parameter

No.18

Parameter

No.25

Parameter

No.25

Machine resonance 

suppression filter 1

Adaptive vibration

 suppression control

00

or

1

2

0

0

1

00

except

Servo
motor

7.2 Machine resonance suppression filter

(1) Function

The machine resonance suppression filter is a filter function (notch filter) which decreases the gain of
the specific frequency to suppress the resonance of the mechanical system. You can set the gain
decreasing frequency (notch frequency) and gain decreasing depth.

Mechanical 
system 
response
level

Machine resonance point

Frequency

Notch 
depth

Notch frequency

Frequency

POINT
The machine resonance suppression filter is a delay factor for the servo
system. Hence, vibration may increase if you set a wrong resonance
frequency or a too deep notch.