YASKAWA SGMJV User Manual page 317

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
A.Cb0:
Encoder Echoback
Error
A.CC0:
Multiturn Limit
Disagreement
A.CF1:
Feedback Option
Module
Communications Error
(Reception error)
A.CF2:
Feedback Option
Module
Communications Error
(Timer stop)
9-18
Cause
The wiring and contact for
encoder cable are incorrect.
Noise interference occurred due
to incorrect cable specifications
of encoder cable.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
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 multiturn limit
value (Pn205) is different from
that of the encoder.
The multiturn limit value of the
encoder is different from that of
the SERVOPACK. Or, the multi-
turn limit value of the SERVO-
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
between serial converter unit and
SERVOPACK.
Cable between serial converter
unit and SERVOPACK is too
long.
Sheath of cable between serial
converter unit and SERVOPACK
is broken.
Noise interferes with the cable
between serial converter unit and
SERVOPACK.
A serial converter unit fault
occurred.
A SERVOPACK fault occurred.
Investigative Actions
Check the wiring.
−
−
Check the cable layout for encoder
cable.
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 length of this cable.
Check the cable for damage.
−
−
−
(cont'd)
Corrective Actions
Correct the wiring.
Use tinned annealed copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
2
core of at least 0.12 mm .
The wiring distance must be 50 m
max.
Properly ground the machines to
separate from encoder FG.
Reduce the machine vibration or
correctly install the servomotor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK 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 to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK 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 I/O
signal line from main circuit cable
or grounding.
Replace the serial converter unit.
Replace the SERVOPACK.