YASKAWA Σ-V Series User Manual page 261

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.C54:
Polarity Detection
Error 2
A.C80:
Absolute Encoder
Clear Error
A.C90:
Encoder
Communications Error
A.C91:
Encoder
Communications
Position Data Error
8-16
Cause
External force was applied to the
linear servomotor.
A linear scale fault occurred.
A SERVOPACK fault occurred.
Contact fault of cable connector
for linear scale or incorrect wir-
ing.
Disconnection or short-circuit of
the cable for linear scale.
Or, incorrect cable impedance.
• 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.
Malfunction caused by noise
interference.
A SERVOPACK fault occurred.
The noise interference occurred
on the input/output signal line
because the linear scale connec-
tion cables are bent and the
sheath is damaged.
The linear scale connection
cables are bundled with a high-
current line or near a high-current
line.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Investigative Actions
−
−
−
Check the status of cable connector
contact for linear scale.
Check the linear scale connection
cables.
Check the operating environment.
−
−
Check the cables and connectors for
linear scale.
Check the layout of the linear scale
connection cables.
Check the layout of the linear scale
connection cables.
Corrective Actions
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.)
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.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Re-insert the cable connectors for
linear scale and confirm that the lin-
ear scale is correctly wired.
Use the linear scale connection
cables with the specified rating.
Improve the operating environmen-
tal conditions, and replace the cable.
If the alarm still occurs, replace the
SERVOPACK.
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.)
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.
Confirm that there is no problem
with the layout of the linear scale
connection cables.
Confirm that there is no surge volt-
age on the linear scale connection
cables.
Properly ground the device to sepa-
rate from the linear scale side FG.