YASKAWA SGD7S series Product Manual page 146

4.2 SERVOPACKs with MECHATROLINK-III Communications References
4.2.3 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.bF2:
System Alarm 2
A.bF3:
System Alarm 3
A.bF4:
System Alarm 4
A.C10:
Servomotor Out
of Control
(Detected when
the servo is
turned ON.)
A.C20:
Phase Detection
Error
4-78
Possible Cause
A failure occurred in
–
the SERVOPACK.
A failure occurred in
–
the SERVOPACK.
A failure occurred in
–
the SERVOPACK.
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.
Confirmation
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
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.
Continued from previous page.
Correction Reference
–
–
–
–
*1
–
–
–
*1
–
Continued on next page.