Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors MECHATROLINK-III Communications Reference - Manual (Page 280)

8.1 Alarm Displays
8-19
8
Trou
blesh
ooting
A.C92:
Encoder
Communications
Timer Error
Noise interference occurred on
the I/O signal line from the linear
scale.
−
Take countermeasures against noise
for the linear scale wiring.
Excessive vibration and shocks
were applied to the linear scale.
Check the operating environment.
Reduce the machine vibration or
correctly install the linear scale.
A linear scale fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
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.CA0:
Encoder Parameter
Error
A linear scale fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
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.Cb0:
Encoder Echoback
Error
The wiring and contact for linear
scale connection cables are incor-
rect.
Check the wiring. Correct the wiring.
Noise interference occurred due
to incorrect cable specifications
of linear scale connection cables.
−
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 linear scale connection cables
are 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 cable layout for linear
scale connection cables. Properly ground the machines to
separate from linear scale FG.
Excessive vibration and shocks
were applied to the linear scale.
Check the operating environment.
Reduce the machine vibration or
correctly install the linear scale.
A linear scale fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
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.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions