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4 Servo Adjustment
MITSUBISHI CNC
4-2 Servo adjustment procedure
Perform adjusting the servo in the factory configuration of the machine. When the servo is adjusted 
without having an enough running-in or a cover, friction torque, machine resonance frequency or 
resonance gain may be different, resulting in an incorrect adjustment.
NO
YES 
Mainly measure the position droop 
waveform.
Measure the electrical end position 
FB (detector position FB) waveform.
Setup has completed.
 
Set speed loop gain 
Set position loop gain 
Measures against the vibration 
·
  Notch filter 
·
  Jitter compensation 
·
  Variable speed loop gain 
Vibration occurs? 
Adjusting servo 
Set the functions of overload detection, 
deceleration control at emergency stop, 
vertical axis drop up
r evention, etc .
 
Improve protrusion at quadrant 
Perform lost motion compensation 
Set protective function 
Adjusting servo completed 
Accuracy adjustment of 
the electrical end position FB has completed.
Perform the adjustment so that vibration or 
overshooting does not occur.
Look for the maximum value not causes
machine resonance. The final setting
value should be 70 to 80% of the
maximum value at which the machine
does not resonate.
CAUTION