YASKAWA E-V Series User Manual page 232

8 Troubleshooting
Problem
Abnormal Noise
from Servomotor
(cont'd)
Servomotor
Vibrates at about
200 to 400 Hz
High
Speed
Overshoot on
Starting and
Stopping.
8-28
Probable Cause
Linear scale fault
Speed loop gain value (Pn100) is
too high.
Position loop gain value (Pn102) is
too high.
Incorrect speed loop integral time
constant (Pn101) setting
Mass ratio data is incorrect.
When the autotuning is used: Incor-
rect mass ratio data setting
Speed loop gain value (Pn100) is
too low.
Position loop gain value (Pn102) is
too high.
Incorrect speed loop integral time
constant (Pn101) setting
Mass ratio data is incorrect.
When the autotuning is used:
Mass ratio data is incorrect.
The force reference is saturated.
The force limit (Pn483, Pn484) is
set to the initial value.
Investigative Actions
−
Check the setting of Pn100 (Speed
Loop Gain).
Check the setting of Pn102 (Posi-
tion Loop Gain).
Check the setting of Pn101 (Speed
Loop Integral Time Constant).
Check the setting of Pn103 (Mass
Ratio).
Check the setting of Pn103 (Mass
Ratio).
Check the setting of Pn100 (Speed
Loop Gain).
Check the setting of Pn102 (Posi-
tion Loop Gain).
Check the setting of Pn101 (Speed
Loop Integral Time Constant).
Check the setting of Pn103 (Mass
Ratio).
Check the setting of Pn103 (Mass
Ratio).
Check the force reference wave
form.
Initial value of force limit:
Pn483 = 30%
Pn484 = 30%
Corrective Actions
Replace the linear scale.
Reduce speed loop gain (Pn100)
preset value.
Reduce position loop gain (Pn102)
preset value.
Correct the speed loop integral time
constant (Pn101) setting.
Correct the setting of Pn103 (Mass
Ratio).
Correct the setting of Pn103 (Mass
Ratio).
Reduce the speed loop gain (Pn100)
preset value.
Reduce the position loop gain
(Pn102) preset value.
Correct the speed loop integral time
constant (Pn101) setting.
Correct the setting of Pn103 (Mass
Ratio).
Correct the setting of Pn103 (Mass
Ratio).
Use the mode switch function.
Set a appropriate value for Pn483
and Pn484 (Force Limit).