3.2 Operating Procedures for Utility Functions
3.2.28 Advanced Autotuning without Reference (Fn201)
3-78
Errors during Calculation of Moment of Inertia
The following table gives the probable causes of errors that may occur
during calculation of the moment of inertia (Jcalc = ON), along with cor-
rective actions for the errors.
Error
Display
Probable Cause Corrective Action
Err1
The SERVOPACK started cal-
culating the moment of inertia
but the calculation was not
completed.
• Increase the setting of Pn100
(Speed Loop Gain).
• Increase the setting of the stroke.
Err2
The moment of inertia fluctu-
ated greatly and did not con-
verge within 10 tries.
Calculate the moment of inertia
based on the machine specifica-
tions, set the value in Pn103, and
execute advanced autotuning with
the Jcalc set to OFF.
Err3
Low-frequency vibration was
detected.
Double the setting of Pn324
(Moment of Inertia Calculation
Starting Level).
Err4 The torque limit was reached.
• If you are using the torque limit,
increase the torque limit.
• Double the setting of Pn324
(Moment of Inertia Calculation
Starting Level).
Err5
The speed control section
changed to proportional con-
trol during calculation of the
moment of inertia, e.g., the /
P-CON (Proportional Control)
signal was input.
Use PI control when calculating the
moment of inertia.
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