YASKAWA SGD7S Product Manual page 498

Problem Possible Cause
Servomotor
The polarity detection was
Does Not
not executed.
Start
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-
Servomotor
ear encoder wiring.
Moves
The setting of Pn282 (Linear
Instanta-
Encoder Pitch) is not correct.
neously,
and Then
The count-up direction of the
Stops
linear encoder does not
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.
Servomotor
The count-up direction of the
Moves with-
linear encoder does not
match the forward direction
out a Refer-
of the Moving Coil in the
ence Input
motor.
Polarity detection was not
performed correctly.
14.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
Check the setting of
Pn080 =n.X (Polar-
ity Sensor Selection).
Check the Servo ON
command input.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
Turn OFF the power sup-
ply to the servo system.
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.
Turn OFF the power sup-
ply to the servo system.
Check the wiring.
−
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
Correct the parameter
page 5-24
setting.
• If you are using an
incremental linear
encoder, send the
Servo ON command
from the host control-
page 5-25
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 5-17
Pn282.
Change the setting of
Pn080 = n.X
(Motor Phase Selec-
page 5-22
tion). 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.
Turn OFF the power
supply to the servo
−
system.
Replace the SERVO-
PACK.
Change the setting of
Pn080 = n.X
(Motor Phase Selec-
tion).
page 5-22
Match the linear
encoder direction and
Servomotor direction.
Correct the settings for
−
the polarity detection-
related parameters.
Continued on next page.
14
14-57