YASKAWA SGMJV User Manual page 349

Alarm:
Alarm Name
The encoder wiring and contact
are incorrect.
Noise interference occurred due
to incorrect encoder cable specifi-
cations.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
The FG potential varies because
of influence from machines on
A.Cb0:
the servomotor side, such as the
Encoder Echoback
welder.
Error
Excessive vibration and shocks
were applied to the encoder.
An encoder fault occurred.
A SERVOPACK fault occurred.
When using a direct-drive (DD)
servomotor, the multi-turn limit
value (Pn205) is different from
that of the encoder.
The multi-turn limit value of the
A.CC0:
encoder is different from that of
the SERVOPACK. Or, the multi-
Multi-turn Limit
turn limit value of the SERVO-
Disagreement
PACK has been changed.
A SERVOPACK fault occurred.
Wiring of cable between serial
converter unit and SERVOPACK
is incorrect or contact is faulty.
The specified cable is not used
*2
A.CF1 :
between serial converter unit and
Feedback Option
SERVOPACK.
Module
Cable between serial converter
Communications Error
unit and SERVOPACK is too
(Reception error)
long.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Noise interferes with the cable
∗2
A.CF2 : between serial converter unit and
SERVOPACK.
Feedback Option
Module
A serial converter unit fault
Communications Error
occurred.
(Timer stop)
A SERVOPACK fault occurred.
∗2. The alarm that may occur in a SERVOPACK with option module for fully-closed loop control.
Cause Investigative Actions
Check the encoder wiring.
−
−
Check the encoder cable and con-
nector.
Check the operating environment.
−
−
Check the value of the Pn205.
Check the value of the Pn205 of the
SERVOPACK.
−
Check the external encoder wiring.
Confirm the external encoder wir-
ing specifications.
Measure the external encoder cable
length.
Check the external encoder cable.
−
−
−
10.1 Troubleshooting
Corrective Actions
Correct the encoder wiring.
Use tinned annealed copper twisted-
pair or shielded twisted-pair cable
2
with a core of at least 0.12 mm
The wiring distance must be 20 m
max.
Make the grounding for the
machine separately from encoder
side FG.
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.
Correct the setting of Pn205 (0 to
65535).
Execute Fn013 at the occurrence of
alarm.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Correct the cable wiring.
Use the specified cable.
Use 20 m cable max.
Replace the cable.
Correct the wiring around serial
converter unit, e.g., separating
input/output signal line from main
circuit cable or grounding.
Replace the serial converter unit.
Replace the SERVOPACK.
.
10
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