YASKAWA SGD7S Product Manual page 440

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.Cb0:
Encoder Echo-
back Error
A.CC0:
Multiturn Limit
Disagreement
12-34
Possible Cause
The encoder is wired
Check the wiring of the
incorrectly or there is
encoder.
faulty contact.
The specifications of
the Encoder Cable are
–
not correct and noise
entered on it.
The Encoder Cable is
too long and noise –
entered on it.
There is variation in
the FG potential
Check the condition of
because of the influ-
the Encoder Cable and
ence of machines on
connectors.
the Servomotor side,
such as a welder.
Excessive vibration or
Check the operating
shock was applied to
conditions.
the encoder.
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
When using a Direct
Drive Servomotor, the
setting of Pn205 (Mul- Check the setting of
titurn Limit) does not Pn205.
agree with the
encoder.
The multiturn limit of
the encoder is differ-
ent from that of the Check the setting of
SERVOPACK. Or, the Pn205 in the SERVO-
multiturn limit of the PACK.
SERVOPACK has
been changed.
A failure occurred in
–
the SERVOPACK.
Confirmation
Make sure that the
encoder is correctly
wired.
Use a shielded twisted-
pair wire cable or a
screened twisted-pair
cable with conductors of
at least 0.12 mm
• Rotary Servomotors:
The Encoder Cable wir-
ing distance must be 50
m max.
• Linear Servomotors:
The Encoder Cable wir-
ing distance must be 20
m max.
Properly ground the
machine to separate it
from the FG of the
encoder.
Reduce machine vibra-
tion.
Correctly install the Ser-
vomotor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Correct the setting of
Pn205 (0 to 65,535).
Change the setting if the
alarm occurs.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction Reference
page 4-26
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2
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page 6-39
page 6-39
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Continued on next page.