YASKAWA Sigma-7 SGD7S Series - Page 622

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.C91
(1C91h)
Encoder Com-
munications
Position Data
Acceleration
Rate Error
Noise entered on the
signal lines because
the Encoder Cable is
bent or the sheath is
damaged.
Check the condition
of the Encoder Cable
and connectors.
Check the Encoder
Cable to see if it is
installed correctly.
Ä Chap. 5.2.3
‘Grounding’
page 90
The Encoder Cable is
bundled with a high-
current line or
installed near a high-
current line.
Check the installa-
tion condition of the
Encoder Cable.
Confirm that there is
no surge voltage on
the Encoder Cable.
–
There is variation in
the FG potential
because of the influ-
ence of machines on
the Servomotor side,
such as a welder.
Check the installa-
tion condition of the
Encoder Cable.
Properly ground the
machine to separate
it from the FG of the
encoder.
–
A.C92
(1C92h)
Encoder Com-
munications
Timer Error
Noise entered on the
signal line from the
encoder.
– Implement counter-
measures against
noise for the encoder
wiring.
Ä Chap. 5.2.2
‘Countermeas-
ures against
Noise’ page 87
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.
–
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.CA0
(1CA0h)
Encoder Param-
eter Error
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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