6.3 Advanced Autotuning (Fn201)
6-25
6
Adjustm
e
nts
(2) Failure in Operation
When "NO-OP" Flashes on the Display
When "Error" 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
Probable Cause
Corrective Actions
The gain adjustment was
not successfully complet-
ed.
Machine vibration is occurring or the posi-
tioning completed signal (/COIN) is turning
ON and OFF when the servomotor is
stopped.
• Increase the set value for Pn522.
• Change the mode from 2 to 3.
• If machine vibration occurs, suppress the
vibration with the anti-resonance control
adjustment function and the vibration
suppression function.
An error occurred during
the calculation of the mo-
ment of inertia.
Refer to the following table
When an Error Occurs during Calculation of Moment of
Inertia
.
Travel distance setting er-
ror
The travel distance is set to approximately
0.5 rotation or less, which is less than the
minimum adjustable travel distance.
Increase the travel distance. It is recom-
mended to set the number of motor rota-
tions to around 3.
The positioning complet-
ed signal (/COIN) did not
turn ON within approxi-
mately 10 seconds after
positioning adjustment
was completed.
The positioning completed width is too nar-
row or proportional control (P control) is
being used.
• Increase the set value for Pn522.
• If P control is used, turn OFF the /P-CON
signal.
The moment of inertia
cannot be calculated
when the tuning-less func-
tion was activated.
When the tuning-less function was activat-
ed, Jcalc was set to OFF so the moment of
inertia was not calculated.
• Turn OFF the tuning-less function.
• Set Jcalc to ON
,
so the moment of inertia
will be calculated.
Error
Display
Probable Cause
Corrective Actions
Err1
The SERVOPACK 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 SERVOPACK with PI control while calcu-
lating the moment of inertia.