YASKAWA Sigma-7 SGD7S Series - Page 623

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A failure occurred in
the SERVOPACK.
– Turn the power
supply to the SER-
VOPACK OFF and
ON again. If the
alarm still occurs, the
SERVOPACK may
be faulty. Replace
the SERVOPACK.
–
A.Cb0
(1Cb0h)
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.
Ä Chap. 5.5
‘Wiring Servo-
motors’
page 107
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.
–
n Rotary Servomo-
tors: The
Encoder Cable
wiring distance
must be 50 m
max.
n Linear Servomo-
tors: The
Encoder Cable
wiring distance
must be 20 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
vibration. Correctly
install the Servo-
motor or linear
encoder.
–
A failure occurred in
the encoder.
– Turn the power
supply to the SER-
VOPACK OFF and
ON again. If the
alarm still occurs, the
Servomotor or linear
encoder may be
faulty. Replace the
Servomotor or linear
encoder.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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