YASKAWA E-V Series User Manual page 222

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.C92:
Encoder
Communications
Timer Error
A.CA0:
Encoder Parameter
Error
A.Cb0:
Encoder Echoback
Error
8-18
Cause
Noise interference occurred on
the input/output signal line from
the encoder.
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A SERVOPACK fault occurred.
An encoder fault occurred.
A SERVOPACK fault occurred.
The encoder wiring and contact
are incorrect.
Noise interference occurred due
to incorrect encoder cable specifi-
cations.
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 SERVOPACK fault occurred.
Investigative Actions
−
Check the operating environment.
−
−
−
−
Check the encoder wiring.
−
−
Check the encoder cable and con-
nector.
Check the operating environment.
−
−
Corrective Actions
Take countermeasures against
noise.
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. Repair or replace the servo-
motor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Repair or replace the SER-
VOPACK.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Repair or replace the servo-
motor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Repair or replace the SER-
VOPACK.
Correct the encoder wiring.
Use tinned annealed copper twisted-
pair or shielded twisted-pair cable
with a core of at least 0.12 mm
The wiring distance must be 20 m
max.
Make the grounding for the
machine separately from encoder
side 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. Repair or replace the servo-
motor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Repair or replace the SER-
VOPACK.
2
.