YASKAWA Sigma-7 SGD7S Series - Page 621

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.C80
(1C80h)
Encoder Clear
Error or Multi-
turn Limit Set-
ting Error
A failure occurred in
the encoder.
– Turn the power
supply to the SER-
VOPACK OFF and
ON again. If an
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.C90
(1C90h)
Encoder Com-
munications
Error
There is a faulty con-
tact in the connector
or the connector is not
wired correctly for the
encoder.
Check the condition
of the encoder con-
nector.
Reconnect the
encoder connector
and check the
encoder wiring.
Ä Chap. 5.5
‘Wiring Servo-
motors’
page 107
There is a cable dis-
connection or shortcir-
cuit in the encoder.
Or, the cable impe-
dance is outside the
specified values.
Check the condition
of the Encoder
Cable.
Use the Encoder
Cable within the
specified specifica-
tions.
–
One of the following
has occurred: corro-
sion caused by
improper temperature,
humidity, or gas, a
short-circuit caused by
entry of water drops or
cutting oil, or faulty
contact in connector
caused by vibration.
Check the operating
environment.
Improve the oper-
ating environmental,
and replace the
cable. If the alarm
still occurs, replace
the SERVOPACK.
Ä Chap. 4.3
‘Mounting Types
and Orientation’
page 75
A malfunction was
caused by noise.
– Correct the wiring
around the encoder
by separating the
Encoder Cable from
the Servomotor Main
Circuit Cable or by
grounding the
encoder.
Ä Chap. 5.2.2
‘Countermeas-
ures against
Noise’ page 87
A failure occurred in
the SERVOPACK.
– Connect the Servo-
motor to another
SERVOPACK, and
turn ON the control
power supply. If no
alarm occurs, the
SERVOPACK may
be faulty. Replace
the SERVOPACK.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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