A.Cb0:
Encoder Echoback
Error
The encoder wiring and contact
are incorrect.
Check the encoder wiring. Correct the encoder wiring.
Noise interference occurred due
to incorrect encoder cable specifi-
cations.
−
Use tinned annealed copper twisted-
pair or shielded twisted-pair cable
with a core of at least 0.12 mm
2
.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
−
The wiring distance must be 20 m
max.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the encoder cable and con-
nector.
Make the grounding for the
machine separately from encoder
side FG.
Excessive vibration and shocks
were applied to the encoder.
Check the operating environment.
Reduce the machine vibration or
correctly install the servomotor.
An encoder fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
A SERVOPACK fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.CC0:
Multi-turn Limit
Disagreement
When using a direct-drive (DD)
servomotor, the multi-turn limit
value (Pn205) is different from
that of the encoder.
Check the value of the Pn205.
Correct the setting of Pn205 (0 to
65535).
The multi-turn limit value of the
encoder is different from that of
the SERVOPACK. Or, the multi-
turn limit value of the SERVO-
PACK has been changed.
Check the value of the Pn205 of the
SERVOPACK.
Execute Fn013 at the occurrence of
alarm.
A SERVOPACK fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.CF1
*2
:
Feedback Option
Module
Communications Error
(Reception error)
Wiring of cable between serial
converter unit and SERVOPACK
is incorrect or contact is faulty.
Check the external encoder wiring. Correct the cable wiring.
The specified cable is not used
between serial converter unit and
SERVOPACK.
Confirm the external encoder wir-
ing specifications.
Use the specified cable.
Cable between serial converter
unit and SERVOPACK is too
long.
Measure the external encoder cable
length.
Use 20 m cable max.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Check the external encoder cable. Replace the cable.
A.CF2
∗2
:
Feedback Option
Module
Communications Error
(Timer stop)
Noise interferes with the cable
between serial converter unit and
SERVOPACK.
−
Correct the wiring around serial
converter unit, e.g., separating
input/output signal line from main
circuit cable or grounding.
A serial converter unit fault
occurred.
− Replace the serial converter unit.
A SERVOPACK fault occurred. − Replace the SERVOPACK.
∗2. The alarm that may occur in a SERVOPACK with option module for fully-closed loop control.
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions
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