YASKAWA SGDV series User Manual page 312

Alarm Number:
Alarm Name
(Alarm Description)
An encoder fault occurred.
A.CA0:
Encoder Parameter
Error
A fault occurred in the SERVO-
PACK.
The wiring and contact for
encoder cable are incorrect.
Noise interference occurred due
to incorrect cable specifications
of encoder cable.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
The FG potential varies because
A.Cb0:
of influence from machines on
Encoder Echoback
the servomotor side, such as the
Error
welder.
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A fault occurred in the SERVO-
PACK.
The multiturn limit value of the
encoder is different from that of
the SERVOPACK. Or, the multi-
A.CC0:
turn limit value of the SERVO-
Multiturn Limit
PACK has been changed.
Disagreement
A fault occurred in the SERVO-
PACK.
Wiring of cable between serial
converter unit and SERVOPACK
is incorrect or contact is faulty.
The specified cable is not used
A.CF1:
between serial converter unit and
Feedback Option
SERVOPACK.
Module
Cable between serial converter
Communications Error
unit and SERVOPACK is too
(Reception error)
long.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Cause Investigative Actions
−
−
Check the wiring.
−
−
Check the cable layout for encoder
cable.
Check the operating environment.
−
−
Check the value of the Pn205 of the
SERVOPACK.
−
Check the external encoder wiring.
Confirm the external encoder wir-
ing specifications.
Measure the length of this cable.
Check the cable for damage.
9.1 Alarm Displays
(cont'd)
Corrective Actions
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Correct the wiring.
Use tinned annealed copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
2
core of at least 0.12 mm .
The wiring distance must be 50 m
max.
Properly ground the machines to
separate from encoder FG.
Reduce the machine vibration or
correctly install the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Execute Fn013 at the occurrence of
alarm.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Correct the cable wiring.
Use the specified cable.
Use 20-m cable max.
Replace the cable.
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