YASKAWA E-7-Series SGD7S - Page 450

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
12-27
12
Maintenance
A.8A0:
External Encoder
Error
Setting the origin of
the absolute linear
encoder failed
because the motor
moved.
Before you set the ori-
gin, use the fully-closed
feedback pulse counter
to confirm that the
motor is not moving.
The motor must be
stopped while setting the
origin position.
page 5-54
A failure occurred in
the external encoder.
–
Replace the external
encoder.
–
A.8A1:
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 Con-
verter Unit.
–
A.8A2:
External Incre-
mental Encoder
Sensor Error
A failure occurred in
the external encoder.
–
Replace the external
encoder.
–
A.8A3:
External Abso-
lute Encoder
Position Error
A failure occurred in
the external absolute
encoder.
–
The external absolute
encoder may be faulty.
Refer to the encoder
manufacturer’s instruc-
tion manual for correc-
tions.
–
A.8A5:
External Encoder
Overspeed
An overspeed error
was detected in the
external encoder.
Check the maximum
speed of the external
encoder.
Keep the external
encoder below its maxi-
mum speed.
–
A.8A6:
External Encoder
Overheated
An overheating error
was detected in the
external encoder.
–
Replace the external
encoder.
–
A.b10:
Speed Reference
A/D Error
(Detected when
the servo is
turned ON.)
A malfunction
occurred in the speed
reference input sec-
tion.
–
Reset the alarm and
restart operation.
page 12-40
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again.
If an alarm still occurs, the
SERVOPACK may be
faulty.
Replace the SERVO-
PACK.
–
A.b11:
Speed Reference
A/D Data Error
A malfunction
occurred in the speed
reference input sec-
tion.
–
Reset the alarm and
restart operation.
page 12-40
A failure occurred in
the SERVOPACK.
–
Turn the power supply to
the SERVOPACK OFF and
ON again.
If an alarm still occurs, the
SERVOPACK may be
faulty.
Replace the SERVO-
PACK.
–
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction
Reference
for Correc-
tion