YASKAWA SGD7S series Product Manual page 179

9.1 Alarm Displays
9.1.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.C10:
Servomotor Out
of Control
(Detected when
the servo is
turned ON.)
A.C20:
Phase Detection
Error
A.C21:
Polarity Sensor
Error
A.C22:
Phase Informa-
tion Disagree-
ment
9-26
Possible Cause
The order of phases
U, V, and W in the Check the Servomotor
motor wiring is not wiring.
correct.
There is an error in the
setting of Pn080 =
Check the setting of
n.X (Motor
Pn080 = n.X.
Phase Sequence
Selection).
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
Check the voltage of
The linear encoder
the linear encoder sig-
signal level is too low.
nal.
Check the setting of
The count-up direc-
Pn080 = n.X
tion of the linear
(Motor Phase Sequence
encoder does not
Selection). Check the
match the forward
installation orientation
direction of the Mov-
for the linear encoder
ing Coil in the motor.
and Moving Coil.
The polarity sensor
signal is being –
affected by noise.
The polarity sensor is
protruding from the Check the polarity sen-
Magnetic Way of the sor.
motor.
The setting of Pn282 Check the setting of
(Linear Encoder Scale Pn282 (Linear Encoder
Pitch) is not correct. Scale Pitch).
The polarity sensor is Check the wiring of the
not wired correctly. polarity sensor.
The polarity sensor
–
failed.
The SERVOPACK
phase information is
different from the lin- –
ear encoder phase
information.
Confirmation
Make sure that the Servo-
motor is correctly wired.
Set Pn080 = n.X to
an appropriate value.
If the motor wiring is cor-
rect and an alarm still
occurs after turning the
power supply OFF and
ON again, the Servomotor
or linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Fine-tune the mounting of
the scale head. Or,
replace the linear
encoder.
Change the setting of
Pn080 = n.X.
Correctly reinstall the lin-
ear encoder or Moving
Coil.
Correct the FG wiring.
Implement countermea-
sures against noise for the
polarity sensor wiring.
Correctly reinstall the
Moving Coil or Magnetic
Way of the motor.
Check the specifications
of the linear encoder and
set a correct value.
Correct the wiring of the
polarity sensor.
Replace the polarity sen-
sor.
Perform polarity detec-
tion.
Continued from previous page.
Correction Reference
–
*1
–
–
–
*1
–
–
*1
–
–
*1
Continued on next page.