6 Adjustments
6.2.2 Procedure for Calculating the Moment of Inertia
6-14
(2) Failure in Operation
When "NO-OP" Flashes on the Display
When an Error Occurs during Calculation of Moment of Inertia
The following table shows the probable causes of errors that may occur during the calculation of the moment
of inertia with the Jcalc set to ON, along with corrective actions for the errors.
Probable Cause
Corrective Actions
The main circuit power supply was OFF.
Turn ON the main circuit power supply.
An alarm or warning occurred.
Remove the cause of the alarm or the warning.
Overtraveling occurred.
Remove the cause of the overtravel.
Gain setting 2 was selected by gain switching.
Disable the automatic gain switching.
The HWBB function operated.
Disable the HWBB function.
Error
Display
Probable Cause
Corrective Actions
Err1
The multi-winding drive unit started calculating
the moment of inertia, but the calculation was
not completed.
• Increase the speed loop gain (Pn100).
• Increase the STROKE (travel distance).
Err2
The moment of inertia fluctuated greatly and
did not converge within 10 tries.
Set the calculation value based on the machine specifi-
cations in Pn103 and execute the calculation with the
Jcalc set to OFF.
Err3
Low-frequency vibration was detected.
Double the set value of the moment of inertia calculat-
ing start level (Pn324).
Err4
The torque limit was reached.
• When using the torque limit, increase the torque
limit.
• Double the set value of the moment of inertia calcu-
lating start level (Pn324).
Err5
While calculating the moment of inertia, the
speed control was set to proportional control
with the /P-CON input.
Operate the multi-winding drive unit with PI control
while calculating the moment of inertia.
