YASKAWA SGD7S Product Manual page 465

Problem Possible Cause
A failure occurred in the SER-
VOPACK.
Servomotor
Does Not
The polarity detection was
Start
not executed.
There is a mistake in the Ser-
vomotor wiring.
There is a mistake in the wir-
ing of the encoder or Serial
Converter Unit.
There is a mistake in the lin-
ear encoder wiring.
The setting of Pn282 (Linear
Servomotor
Encoder Scale Pitch) is not
Moves
correct.
Instanta-
neously,
The count-up direction of the
and Then
linear encoder does not
Stops
match the forward direction
of the Moving Coil in the
motor.
Polarity detection was not
performed correctly.
Servomotor
There is a faulty connection
Speed Is
in the Servomotor wiring.
Unstable
A failure occurred in the SER-
VOPACK.
The count-up direction of the
linear encoder does not
Servomotor
match the forward direction
Moves with-
of the Moving Coil in the
out a Refer-
motor.
ence Input
Polarity detection was not
performed correctly.
12.5 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
–
Check the setting of
Pn080 =n.X (Polar-
ity Sensor Selection).
Check the inputs to the
SV_ON (Servo ON) com-
mand.
Check the wiring.
Check the wiring.
Check the wiring.
Check the setting of
Pn282.
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
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.
–
Check the directions.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
Continued from previous page.
Correction Reference
Replace the SERVO-
–
PACK.
Correct the parameter
page 5-23
setting.
• If you are using an
incremental linear
encoder, send the
SV_ON command
from the host control-
page 5-24
ler.
• If you are using an
absolute linear
encoder, execute
polarity detection.
Wire the Servomotor
–
correctly.
Wire the Serial Con-
–
verter Unit correctly.
Wire the cable cor-
–
rectly.
Correct the setting of
page 5-16
Pn282.
Change the setting of
Pn080 = n.X
(Motor Phase
Sequence Selection).
page 5-21
Place the linear
encoder and motor in
the same direction.
Correct the settings for
the polarity detection-
–
related parameters.
Tighten any loose ter-
minals or connectors
–
and correct the wiring.
Replace the SERVO-
–
PACK.
Change the setting of
Pn080 = n.X
(Motor Phase
Sequence Selection).
page 5-21
Match the linear
encoder direction and
Servomotor direction.
Correct the settings for
the polarity detection-
–
related parameters.
Continued on next page. 12
12-59