YASKAWA SGMGV - Page 348

10 Troubleshooting
10.1.2 Troubleshooting of Alarms
10-16
A.C90:
Encoder
Communications Error
Contact fault of encoder connec-
tor or incorrect encoder wiring.
Check the encoder connector con-
tact status.
Re-insert the encoder connector and
confirm that the encoder is correctly
wired.
Encoder cable disconnection or
short-circuit.
Or, incorrect cable impedance.
Check the encoder cable.
Use the encoder cable with the
specified rating.
Corrosion caused by improper
temperature, humidity, or gas
Short-circuit caused by intrusion
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
encoder to avoid noise interference
(Separate the encoder cable from
the servomotor main circuit cable,
improve grounding, etc.)
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
The noise interference occurred
on the input/output signal line
because the encoder cable is bent
and the sheath is damaged.
Check the encoder cable and con-
nector.
Confirm that there is no problem
with the encoder cable layout.
The encoder cable is bundled
with a high-current line or near a
high-current line.
Check the encoder cable layout.
Confirm that there is no surge volt-
age on the encoder cable.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the encoder cable layout.
Properly ground the device to sepa-
rate from the encoder FG.
A.C92:
Encoder
Communications
Timer Error
Noise interference occurred on
the input/output signal line from
the encoder.
−
Take countermeasures against
noise.
Excessive vibration and shocks
were applied to the encoder.
Check the operating environment.
Reduce the machine vibration or
correctly install the servomotor.
An encoder fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
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
An encoder fault occurred. −
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
A SERVOPACK fault occurred.
−
T
urn 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