YASKAWA Sigma-V Series User Manual page 374

10 Troubleshooting
10.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
(Alarm Description)
A.C92:
Encoder
Communications
Timer Error
A.CA0:
Encoder Parameter
Error
A.Cb0:
Encoder Echoback
Error
A.CC0:
Multiturn Limit
Disagreement
10-18
Cause
Noise interference occurred on
the I/O signal line from the
encoder.
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A fault occurred in the SERVO-
PACK.
An encoder fault occurred.
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
of influence from machines on
the servomotor side, such as the
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-
turn limit value of the SERVO-
PACK has been changed.
A fault occurred in the SERVO-
PACK.
Investigative Actions
−
Check the operating environment.
−
−
−
−
Check the wiring.
−
−
Check the cable layout for encoder
cable.
Check the operating environment.
−
−
Check the value of the Pn205 of the
SERVOPACK.
−
(cont'd)
Corrective Actions
Take countermeasures against noise
for the encoder wiring.
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.
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.