Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 269)

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-18
A.C92:
Encoder
Communications
Timer Error
Noise interference occurred on
the input/output signal line from
the linear scale.
−
Take countermeasures against
noise.
Excessive vibration and shocks
were applied to the linear scale.
Check the operating environment.
Reduce the machine vibration or
correctly install the linear servomo-
tor.
A linear scale fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear servomotor may
be faulty. Replace the linear servo-
motor.
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 servomotor may
be faulty. Replace the linear servo-
motor.
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 linear scale wiring and con-
tact are incorrect.
Check the linear scale wiring. Correct the linear scale wiring.
Noise interference occurred due
to incorrect specifications of the
linear scale connection cables.
−
Use tinned annealed copper twisted-
pair or shielded twisted-pair cable
with a core of at least 0.12 mm
2
.
Noise interference occurred
because the wiring distance of the
linear scale connection cables is
too long.
−
The wiring distance must be 20 m
max.
The FG potential varies because
of influence from machines, such
as welder, on the linear servomo-
tor side.
Check the cables and connectors for
linear scale.
Make the grounding for the
machine separately from linear
scale side FG.
Excessive vibration and shocks
were applied to the linear scale.
Check the operating environment.
Reduce the machine vibration or
correctly install the linear servomo-
tor.
A linear scale fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear servomotor may
be faulty. Replace the linear servo-
motor.
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.
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions