CHAPTER 4 PARAMETER
4-18
Basic Parameters
4
PA1_14 Load inertia ratio
No. Name Setting range
Default value
Change
14 Load inertia ratio
GYS and GYC, 750 [W] or less:
0.0 to 300.0 [times]
GYS and GYC, 1 [kW] or more:
0.0 to 100.0 [times]
GYG : 0.0 to 30.0 [times]
1.0 Always
This parameter is enabled under position and speed control.
Enter the moment of inertia of the load of the mechanical system in relation to the motor shaft (moment
of inertia of load converted to motor shaft) in a ratio to the moment of inertia of the motor.
Load inertia ratio
Load inertia of converted to motor shaft
Inertia of motor
=
The parameter must be entered according to some settings of PA1_13 (tuning mode selection).
With auto tuning, the value is automatically updated and saved in EEPROM every 10 minutes.
The value must be entered in the mode other than auto tuning.
How to enter the ratio of inertia of load
(1) Entering the value monitored on display
Use the monitor mode of the display to monitor.
Enter the monitored value.
If the value drifts, enter an average value.
If fluctuation is substantial and the ratio of the maximum to the minimum exceeds two, adopt
entry method (2).
(2) Entering the calculated value
Calculate the moment of inertia of load converted to the motor shaft and enter the ratio to the
moment of inertia of the motor. For the moment of inertia calculation method, refer to "CHAPTER
14 APPENDICES."
The value is automatically calculated with the capacity selection software (visit Fuji Electric's
home page to download).
PA1_15 Auto tuning gain 1
No. Name Setting range
Default
value
Change
15 Auto tuning gain 1 1 to 40 12 Always
This parameter is enabled under speed and position control.
Specify the response of the servomotor in the mode other than manual tuning.
While a larger setting shortens command following characteristic and positioning settling time, too large
a value causes vibration of the motor.
on14
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