9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-18
A.Cb0:
Encoder Echoback
Error
The wiring and contact for
encoder cable are incorrect.
Check the wiring.
Correct the wiring.
Noise interference occurred due
to incorrect cable specifications
of encoder cable.
−
Use tinned annealed copper
shielded twisted-pair or screened
unshielded 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 50 m
max.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the cable layout for encoder
cable.
Properly ground the machines to
separate from encoder 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 to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
A SERVOPACK fault occurred.
−
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.CC0:
Multiturn Limit
Disagreement
When using a direct drive (DD)
servomotor, the multiturn 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 multiturn 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 to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
A.CF1:
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 length of this cable.
Use 20-m cable max.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Check the cable for damage.
Replace the cable.
A.CF2:
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 I/O
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.
(cont’d)
Alarm Number:
Alarm Name
Cause
Investigative Actions
Corrective Actions