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Troubleshooting
6.4.4 Motor hunts
(1) Speed control
Y
Y
N
N
Y
N
Y
Increase the torque restriction
level.
Lighten the load.
N
The motor hunts.
Is the speed setting
varying?
PLG has not been set.
Is there load variation?
Is torque restriction
being made?
Take proper action to stabilize
the speed setting.
(Example: Enter the filter time
constant (Pr. 822) to the
analog terminal.)
Perform easy gain tuning
(Pr. 819 = 1 (load estimation,
gain estimation), 2
(gain estimation)).
However, gain estimation and
load estimation may not be
made well depending on the
machine and operational
specifications.
(For details, refer to
Choose model adaptive speed
control. (Pr. 877) <Refer to the
Instruction Manual (detailed).>
Alternatively, if load variation is large,
the motor speed also varies.
Increasing the response of speed
control decreases speed variation.
Perform PLG setting
Is the speed gain too
high compared to the
machine?
Y
N
Please contact your sales
representative.
page 43.)
(Refer to page 12 for details.)