12.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
12-54
Servomotor
Moves
Instanta-
neously,
and Then
Stops
There is a mistake in the Ser-
vomotor wiring.
Check the wiring.
Wire the Servomotor
correctly.
–
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
Check the wiring.
Wire the Serial Con-
verter Unit correctly.
–
There is a mistake in the lin-
ear encoder wiring.
Check the wiring.
Wire the cable cor-
rectly.
–
The setting of Pn282 (Linear
Encoder Scale Pitch) is not
correct.
Check the setting of
Pn282.
Correct the setting of
Pn282.
page 5-19
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
Sequence Selection).
Place the linear
encoder and motor in
the same direction.
page 5-25
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.
–
Servomotor
Speed Is
Unstable
There is a faulty connection
in the Servomotor wiring.
The connector connec-
tions for the power line
(U, V, and W phases) and
the encoder or Serial
Converter Unit may be
unstable. Check the wir-
ing.
Tighten any loose ter-
minals or connectors
and correct the wiring.
–
Servomotor
Moves with-
out a Refer-
ence Input
Speed control: The speed
reference input is not appro-
priate.
Check between the
speed reference input (V-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Correctly set the con-
trol method and input
method.
page 9-7
Torque control: The torque
reference input is not appro-
priate.
Check between the
torque reference input (T-
REF) and signal ground
(SG) to see if the control
method and the input
agree.
Correctly set the con-
trol method and input
method.
page 9-7
The speed reference offset is
not correct.
The SERVOPACK offset
is adjusted incorrectly.
Adjust the SERVO-
PACK offset.
page 6-18
Position control: The refer-
ence pulse input is not
appropriate.
Check the setting of
Pn200 =n.X (Refer-
ence Pulse Form) and the
sign and pulse signals.
Correctly set the con-
trol method and input
method.
–
A failure occurred in the
SERVOPACK.
–
Replace the SERVO-
PACK.
–
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
Sequence Selection).
Match the linear
encoder direction and
Servomotor direction.
page 5-25
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.
–
Continued on next page.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference
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