YASKAWA Sigma-7 SGD7S Series - Page 615

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.890
(1890h)
Encoder Scale
Error
A failure occurred in
the linear encoder.
– The linear encoder
may be faulty.
Replace the linear
encoder.
–
A.891
(1891h)
Encoder Module
Error
A failure occurred in
the linear encoder.
– Turn the power
supply to the SER-
VOPACK OFF and
ON again. If the
alarm still occurs, the
linear encoder may
be faulty. Replace
the linear encoder.
–
A.8A0
(18A0h)
External
Encoder Error
Setting the origin of
the absolute linear
encoder failed
because the motor
moved.
Before you set the
origin, use the fully-
closed feedback
pulse counter to con-
firm that the motor is
not moving.
The motor must be
stopped while setting
the origin position.
Ä Chap. 6.17
‘Setting the
Origin of the
Absolute
Encoder’
page 190
A failure occurred in
the external encoder.
– Replace the external
encoder.
–
A.8A1
(18A1h)
External
Encoder Module
Error
A failure occurred in
the external encoder.
– Replace the external
encoder.
–
A failure occurred in
the Serial Converter
Unit.
– Replace the Serial
Converter Unit.
–
A.8A2
(18A2h)
External Incre-
mental Encoder
Sensor Error
A failure occurred in
the external encoder.
– Replace the external
encoder.
–
A.8A3
(18A3h)
External Abso-
lute Encoder
Position Error
A failure occurred in
the external absolute
encoder.
– The external abso-
lute encoder may be
faulty. Refer to the
encoder manufactur-
er’s instruction
manual for correc-
tions.
–
A.8A5
(18A5h)
External
Encoder Over-
speed
An overspeed error
was detected in the
external encoder.
Check the maximum
speed of the external
encoder.
Keep the external
encoder below its
maximum speed.
–
A.8A6
(18A6h)
External
Encoder Over-
heated
An overheating error
was detected in the
external encoder.
– Replace the external
encoder.
–
A.b33
(1b33h)
Current Detec-
tion Error 3
A failure occurred in
the current detection
circuit.
– 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.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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