Block diagram of easy gain tuning function
• Easy gain tuning is valid for the first motor. When applying the second motor (RT signal is ON), tuning is not performed.
Execution procedure for easy gain tuning (Pr.819 = "1" Load inertia ratio
Easy gain tuning (load inertia ratio automatic calculation) is only valid in the speed control and position control modes of Vector
control. It is invalid under torque control, V/F control, Advanced magnetic flux vector control, Real sensorless vector control,
and PM sensorless vector control.
Set the response level in Pr.818 Easy gain tuning response level setting.
Setting this parameter higher improves the trackability for commands, but setting it too high causes vibration. The
following figure shows the relationship between the setting and the response level.
Pr. 818 setting
The load inertia ratio is calculated during acceleration/deceleration, and from this value and the value of Pr.818 Easy
gain tuning response level setting, the gain for each control is set automatically.
Pr.880 Load inertia ratio is used as the initial value of the load inertia ratio when performing tuning. During tuning,
the estimated value is set in Pr.880.
The calculation of the load inertia ratio may take excessive time or otherwise not be performed properly if the
following conditions are not satisfied.
Speed control/position loop gain
Model speed control gain
[Pr.820, Pr.821, Pr.828, Pr.422]
ON when [Pr.819 = "1, 2"]
Load inertia ratio
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
[Pr.819 = "1"]
Actual motor speed
98 122 150