8.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
8-54
Servomotor
Moves with-
out a Refer-
ence Input
A failure occurred in the SER-
VOPACK.
–
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
–
The count-up direction of the
linear encoder does not
match the forward direction
of the Moving Coil in the
motor.
Check the directions.
Change the setting of
Pn080 = n.X
(Motor Phase Selec-
tion).
Match the linear
encoder direction and
Servomotor direction.
–
Polarity detection was not
performed correctly.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
Correct the settings for
the polarity detection-
related parameters.
–
Dynamic
Brake Does
Not Operate
The setting of Pn001 =
n.X (Servo OFF or
Alarm Group 1 Stopping
Method) is not suitable.
Check the setting of
Pn001 = n.X.
Set Pn001 = n.X
correctly.
–
The dynamic brake resistor is
disconnected.
Check the moment of
inertia, motor speed, and
dynamic brake frequency
of use. If the moment of
inertia, motor speed, or
dynamic brake frequency
of use is excessive, the
dynamic brake resis-
tance may be discon-
nected.
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK. To pre-
vent disconnection,
reduce the load.
–
There was a failure in the
dynamic brake drive circuit.
–
There is a defective
component in the
dynamic brake circuit.
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
–
Abnormal
Noise from
Servomotor
The Servomotor vibrated
considerably while perform-
ing the tuning-less function
with the default settings.
Check the waveform of
the motor speed.
Reduce the load so
that the moment of
inertia ratio or mass
ratio is within the allow-
able value, or increase
the load level or reduce
the rigidity level in the
tuning-less level set-
tings.
–
The machine mounting is not
secure.
Turn OFF the power sup-
ply to the servo system.
Check to see if there are
any loose mounting
screws.
Tighten the mounting
screws.
–
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
misalignment in the cou-
pling.
Align the coupling.
–
Turn OFF the power sup-
ply to the servo system.
Check to see if the cou-
pling is balanced.
Balance the coupling.
–
Continued on next page.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference
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