Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 268)

8.1 Troubleshooting
8-17
8
T
roubleshooting
A.C54:
Polarity Detection
Error 2
External force was applied to the
linear servomotor.
−
Increase the value of the polarity
detection confirmation force refer-
ence (Pn495).
Increase the value of the polarity
detection allowable error range
(Pn498).
(Note that increasing the allowable
error range will also increase the
motor temperature.)
A.C80:
Absolute Encoder
Clear 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.C90:
Encoder
Communications Error
Contact fault of cable connector
for linear scale or incorrect wir-
ing.
Check the status of cable connector
contact for linear scale.
Re-insert the cable connectors for
linear scale and confirm that the lin-
ear scale is correctly wired.
Disconnection or short-circuit of
the cable for linear scale.
Or, incorrect cable impedance.
Check the linear scale connection
cables. Use the linear scale connection
cables with the specified rating.
• Corrosion caused by improper
temperature, humidity, or gas.
• Short-circuit caused by intru-
sion of water drops or cutting
oil.
• Connector contact fault caused
by vibration.
Check the operating environment.
Improve the operating environmen-
tal conditions, and replace the cable.
If the alarm still occurs, replace the
SERVOPACK.
Malfunction caused by noise
interference.
−
Correct the wiring around the linear
scale to avoid noise interference
(Separate the linear scale connec-
tion cables from the linear servomo-
tor main circuit cable, improve
grounding, etc.)
A SERVOPACK fault occurred. −
Connect the linear servomotor to
another SERVOPACK, and turn ON
the control power. If no alarm
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.C91:
Encoder
Communications
Position Data Error
The noise interference occurred
on the input/output signal line
because the linear scale connec-
tion cables are bent and the
sheath is damaged.
Check the cables and connectors for
linear scale.
Confirm that there is no problem
with the layout of the linear scale
connection cables.
The linear scale connection
cables are bundled with a high-
current line or near a high-current
line. Check the layout of the linear scale
connection cables.
Confirm that there is no surge volt-
age on the linear scale connection
cables.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the layout of the linear scale
connection cables. Properly ground the device to sepa-
rate from the linear scale side FG.
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions