Chapter 1 Adjustment Function Types; Adjustment Function Available To Servo Amplifier Alone; Functions To Automatically Adjust Machine Stability - Mitsubishi Electric MELSERVO J5 Series User Manual

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ADJUSTMENT FUNCTION TYPES
A servo amplifier is equipped with various servo parameters that can be used to adjust operation status. To maximize the
machine's performance , these servo parameters are required to be set in accordance with the machine's characteristic. The
gain adjustment is set to "Auto tuning mode 1" at the factory setting. Use each adjustment function to improve the
responsiveness.
Precautions
• MR-J5-_G_-RJ and MR-J5-_A_-RJ will be available in the future.
• When using the torque mode, gain adjustment is not required.
• Before adjusting gains, check that your machine has not been operated at the maximum torque of the servo motor. If
operated in excess of the maximum torque, the machine may vibrate and operate unexpectedly. In addition, adjust gains
taking into account that each machine is different. It is recommended to keep the torque of the servo motor generated
during operation to be under 90 % of the maximum torque of the servo motor.
• If the torque of the servo motor reaches the torque limit value, even if the gain is changed, the response of the servo motor
does not change and the gain adjustment cannot perform accurately.
• When using a linear servo motor, replace the wording of the sentence as follows.
Load to motor inertia ratio → Load to motor mass ratio
Torque → Thrust
1.1
Adjustment function available to servo amplifier
alone
The following table shows the adjustment functions available to servo amplifier alone.

Functions to automatically adjust machine stability

Adjustment function Outline
Quick tuning Use this function to prioritize reduction of the overshoot rather than shortening the settling time. An
adjustment is enabled without the positioning operation.
Auto tuning mode 1 Use this function to adjust the machine while checking the response waveform when the load to motor
inertia ratio of the device is unknown. Also use this function when the load to motor inertia ratio of a
machine varies during operation.
Auto tuning mode 2 Use this function to adjust the machine while checking the response waveform when the load to motor
inertia ratio of the device is known.
2 gain adjustment mode 1 Use this function for auto tuning a machine that requires path accuracy improvement, such as XY table
and tandem mechanism, and to suppress inter-axis interference.
2 gain adjustment mode 2 Use this function to adjust settling time and overshoot amount after the quick tuning or one-touch tuning
was performed.
1 ADJUSTMENT FUNCTION TYPES

1.1 Adjustment function available to servo amplifier alone

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Reference
Page 12
Quick tuning
Page 37 Auto
tuning mode 1
Page 41 Auto
tuning mode 2
Page 43 2
gain adjustment
mode 1
Page 44 2
gain adjustment
mode 2
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