YASKAWA Sigma-V Series User Manual page 266

Alarm Number:
Alarm Name
(Alarm Description)
Contact fault of connector or
incorrect wiring for encoder
cable.
Cable disconnection for encoder
cable or short-circuit.
Or, incorrect cable impedance.
Corrosion caused by improper
temperature, humidity, or gas,
short-circuit caused by intrusion
of water drops or cutting oil, or
A.C90:
connector contact fault caused by
Encoder
vibration.
Communications Error
Malfunction caused by noise
interference.
A fault occurred in the multi-
winding drive unit.
Noise interference occurred on
the I/O signal line because the
encoder cable is bent and the
sheath is damaged.
A.C91:
The encoder cable is bundled
Encoder
with a high-current line or near a
Communications
high-current line.
Position Data Error
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Noise interference occurred on
the I/O signal line from the
encoder.
Excessive vibration and shocks
were applied to the encoder.
A.C92:
Encoder
An encoder fault occurred.
Communications
Timer Error
A fault occurred in the multi-
winding drive unit.
An encoder fault occurred.
A.CA0:
Encoder Parameter
Error
A fault occurred in the multi-
winding drive unit.
Cause Investigative Actions
Check the connector contact status
for encoder cable.
Check the encoder cable.
Check the operating environment.
−
−
Check the encoder cable and con-
nector.
Check the cable layout for encoder
cable.
Check the cable layout for encoder
cable.
−
Check the operating environment.
−
−
−
−
8.1 Alarm Displays
(cont'd)
Corrective Actions
Re-insert the connector and confirm
that the encoder is correctly wired.
Use the cable with the specified rat-
ing.
Improve the operating environmen-
tal conditions, and replace the cable.
If the alarm still occurs, replace the
multi-winding drive unit.
Correct the wiring around the
encoder by separating the encoder
cable from the servomotor main cir-
cuit cable or by checking the
grounding and other wiring.
Connect the servomotor to another
SERVOPACK, and turn ON the
control power supply. If no alarm
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
Confirm that there is no problem
with the cable layout.
Confirm that there is no surge volt-
age on the cable.
Properly ground the machines to
separate from the encoder FG.
Take countermeasures against noise
for the encoder wiring.
Reduce the machine vibration or
correctly install the servomotor.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
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