10 Troubleshooting
10.1.2 Troubleshooting of Alarms
10-16
A.8A5:
External Encoder
Overspeed
The overspeed from the external
encoder occurred.
Check the maximum speed of the
external encoder.
Keep the external encoder below its
maximum speed.
A.8A6:
External Encoder
Overheated
The overheat from the external
encoder occurred.
− Replace the external encoder.
A.b10:
Speed Reference A/D
Error
(Detected when the
servo is ON.)
A malfunction occurred in the
speed reference input section.
−
Clear and reset the alarm and restart
the operation.
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b11:
Speed Reference A/D
Data Error
A malfunction occurred in the
speed reference input section.
−
Clear and reset the alarm and restart
the operation.
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b20:
Reference Torque In-
put Read
Error
(Detected when the
servo is ON.)
A malfunction occurred in the
reading section of the torque ref-
erence input.
−
Clear and reset the alarm and restart
the operation.
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b31:
Current Detection
Error 1
The current detection circuit for
phase U is faulty.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b32:
Current Detection
Error 2
The current detection circuit for
phase V is faulty.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.b33:
Current Detection
Error 3
The detection circuit for the cur-
rent is faulty.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
The servomotor main circuit
cable is disconnected.
Check for disconnection of the ser-
vomotor main circuit cable.
Correct the servomotor wiring.
A.bF0:
System Alarm 0
A fau
lt occurred in the SERVO-
PA
CK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.bF1:
System Alarm 1
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.bF2:
System Alarm 2
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.bF3
:
System Alarm 3
A fault occurred in the SERVO-
PACK.
−
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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