YASKAWA E-7S SERVOPACK SGD7S Product Manual page 541

15.2 Alarm Displays
15.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.bF7:
System Alarm 7
A.bF8:
System Alarm 8
A.C10:
Servomotor Out
of Control
(Detected when
the servo is
turned ON.)
A.C20:
Phase Detection
Error
A.C21:
Polarity Sensor
Error
15-30
Possible Cause
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 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 Selec-
encoder does not
tion). Check the installa-
match the forward
tion orientation for the
direction of the Mov-
linear encoder and
ing Coil in the motor.
Moving Coil.
The polarity sensor
signal is being –
affected by noise.
The setting of Pn282 Check the setting of
Pn282 (Linear Encoder
(Linear Encoder Scale
Pitch) is not correct. Scale Pitch).
The polarity sensor is
protruding from the Check the polarity sen-
Magnetic Way of the sor.
motor.
The polarity sensor is Check the wiring of the
not wired correctly. polarity sensor.
The polarity sensor
–
failed.
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.
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.
Check the specifications
of the linear encoder and
set a correct value.
Correctly reinstall the
Moving Coil or Magnetic
Way of the motor.
Correct the wiring of the
polarity sensor.
Replace the polarity sen-
sor.
Continued from previous page.
Correction Reference
–
–
–
page 5-21
–
–
–
page 5-21
–
page 5-16
–
–
–
Continued on next page.