Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors MECHATROLINK-III Communications Reference - Manual (Page 279)

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-18
A.C54:
Polarity Detection
Error 2
External force was applied to the
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 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 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.C90:
Encoder
Communications Error
Contact fault of connector or
incorrect wiring for linear scale
connection cables.
Check the connector contact status
for linear scale connection cables.
Re-insert the connectors and con-
firm that the linear scale is correctly
wired.
Cable disconnection for linear
scale connection cables or short-
circuit.
Or, incorrect cable impedance.
Check the linear scale connection
cables. Use the cables with the specified
rating.
Corrosion caused by improper
temperature, humidity, or gas,
short-circuit caused by intrusion
of water drops or cutting oil, or
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 by separating the linear scale
connection cables from the servo-
motor main circuit cable or by
checking the grounding and other
wiring.
A SERVOPACK fault occurred. −
Connect the 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
Noise interference occurred on
the I/O signal line because the
linear scale connection cables are
bent and the sheaths are dam-
aged.
Check the linear scale connection
cables and connectors. Confirm that there is no problem
with the cable layout.
The linear scale connection
cables are bundled with a high-
current line or near a high-current
line.
Check the cable layout for linear
scale connection cables. Confirm that there is no surge volt-
age on the cables.
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 the linear scale FG.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions