YASKAWA SGD7S Product Manual page 273

8.5 Estimating the Moment of Inertia
8.5.4 Operating Procedure
4.
Click the Execute Button.
5.
Set the conditions as required.



 Speed Loop Setting Area
Make the speed loop settings in this area.
If the speed loop response is too bad, it will not be possible to measure the moment of
inertia ratio accurately.
The values for the speed loop response that are required for moment of inertia estimation
are set for the default settings. It is normally not necessary to change these settings.
If the default speed loop gain is too high for the machine (i.e., if vibration occurs), lower
the setting. It is not necessary to increase the setting any farther.
 Identification Start Level Group
This is the setting of the moment of inertia calculation starting level.
If the load is large or the machine has low rigidity, the torque limit may be applied, caus-
ing moment of inertia estimation to fail.
If that occurs, estimation may be possible if you double the setting of the start level.
 Edit Buttons
Click the button to display a dialog box to change the settings related to the speed loop
or estimation start level.
 Help Button
Click this button to display guidelines for setting the reference conditions. Make the fol-
lowing settings as required.
• Operate the Servomotor to measure the load moment of inertia of the machine in com-
8-18
parison with the rotor moment of inertia.





