3.5 FT83 SERVOPACKs with Analog Voltage/Pulse Train References
3.5.3 Troubleshooting Alarms
3-228
A.Cb0:
Encoder Echo-
back Error
The encoder is wired
incorrectly or there is
faulty contact.
Check the wiring of the
encoder.
Make sure that the
encoder is correctly
wired.
*1
The specifications of
the Encoder Cable are
not correct and noise
entered on it.
–
Use a shielded twisted-
pair wire cable or a
screened twisted-pair
cable with conductors of
at least 0.12 mm
2
.
–
The Encoder Cable is
too long and noise
entered on it.
–
Rotary Servomotors: The
Encoder Cable wiring dis-
tance must be 50 m max.
–
There is variation in
the FG potential
because of the influ-
ence of machines on
the Servomotor side,
such as a welder.
Check the condition of
the Encoder Cable and
connectors.
Properly ground the
machine to separate it
from the FG of the
encoder.
–
Excessive vibration or
shock was applied to
the encoder.
Check the operating
conditions.
Reduce machine vibra-
tion.
Correctly install the Ser-
vomotor.
–
A failure occurred in
the encoder.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor
may be faulty. Replace the
Servomotor.
–
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
–
A.CC0:
Multiturn Limit
Disagreement
When using a Direct
Drive Servomotor, the
setting of Pn205 (Mul-
titurn Limit Setting)
does not agree with
the encoder.
Check the setting of
Pn205.
Correct the setting of
Pn205 (0 to 65,535).
*1
The multiturn limit of
the encoder is differ-
ent from that of the
SERVOPACK. Or, the
multiturn limit of the
SERVOPACK has
been changed.
Check the setting of
Pn205 in the SERVO-
PACK.
Change the setting if the
alarm occurs.
*1
A failure occurred in
the SERVOPACK.
–
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 on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause
Confirmation
Correction
Reference