YASKAWA SGMJV User Manual page 348

10 Troubleshooting
10.1.2 Troubleshooting of Alarms
Alarm:
Alarm Name
A.C90:
Encoder
Communications Error
A.C91:
Encoder
Communications
Position Data Error
A.C92:
Encoder
Communications
Timer Error
A.CA0:
Encoder Parameter
Error
10-16
Cause
Contact fault of encoder connec-
tor or incorrect encoder wiring.
Encoder cable disconnection 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
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 encoder cable is bent
and the sheath is damaged.
The encoder cable is 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.
Noise interference occurred on
the input/output signal line from
the encoder.
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A SERVOPACK fault occurred.
An encoder fault occurred.
A SERVOPACK fault occurred.
Investigative Actions
Check the encoder connector con-
tact status.
Check the encoder cable.
Check the operating environment.
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−
Check the encoder cable and con-
nector.
Check the encoder cable layout.
Check the encoder cable layout.
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Check the operating environment.
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−
−
−
Corrective Actions
Re-insert the encoder connector and
confirm that the encoder is correctly
wired.
Use the encoder cable 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
encoder to avoid noise interference
(Separate the encoder cable from
the servomotor main circuit cable,
improve grounding, etc.)
Connect the 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 encoder cable layout.
Confirm that there is no surge volt-
age on the encoder cable.
Properly ground the device to sepa-
rate from the encoder FG.
Take countermeasures against
noise.
Reduce the machine vibration or
correctly install the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.