YASKAWA Sigma-7 SGD7S Series - Page 611

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
A.820
(1820h)
Encoder
Checksum
Alarm (Detected
at the encoder.)
A failure occurred in
the encoder.
–
n When Using an
Absolute
Encoder
– Set up the
encoder
again. If the
alarm still
occurs, the
Servomotor
may be
faulty.
Replace the
Servomotor.
n When Using a
Singleturn Abso-
lute Encoder or
Incremental
Encoder
– The Servo-
motor may
be faulty.
Replace the
Servomotor.
– The linear
encoder may
be faulty.
Replace the
linear
encoder.
Ä Chap. 6.16
‘Resetting the
Absolute
Encoder’
page 186
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.830
(1830h)
Encoder Battery
Alarm (The
absolute
encoder battery
voltage was
lower than the
specified level.)
The battery connec-
tion is faulty or a bat-
tery is not connected.
Check the battery
connection.
Correct the battery
connection.
Ä Chap. 5.5.3
‘Wiring the
SERVOPACK to
the Encoder’
page 108
The battery voltage is
lower than the speci-
fied value (2.7 V).
Measure the battery
voltage.
Replace the battery.
Ä Chap. 16.2.4
‘Replacing the
Battery’
page 580
A failure occurred in
the SERVOPACK.
– The SERVOPACK
may be faulty.
Replace the SERVO-
PACK.
–
A.840
(1840h)
Encoder Data
Alarm (Detected
at the encoder.)
The encoder malfunc-
tioned.
– 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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