YASKAWA SGD7S Product Manual page 473

14.2 Alarm Displays
14.2.2 Troubleshooting Alarms
Alarm Number:
Alarm Name
A.C52:
Polarity Detec-
tion Not Com-
pleted
A.C53:
Out of Range of
Motion for Polar-
ity Detection
A.C54:
Polarity Detec-
tion Failure 2
A.C80:
Encoder Clear
Error or Multiturn
Limit Setting Error
14-32
Possible Cause
The servo was turned
ON under the follow-
ing circumstances.
• When an absolute
linear encoder was –
being used
• When polarity
detection was not
completed
The travel distance
exceeded the setting
of Pn48E (Polarity
–
Detection Range) in
the middle of detec-
tion.
An external force was
applied to the Servo- –
motor.
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
Confirmation
Perform polarity detec-
tion.
Increase the setting of
Pn48E (Polarity Detection
Range). Or, increase the
setting of Pn481 (Polarity
Detection Speed Loop
Gain).
Increase the setting of
Pn495 (Polarity Detection
Confirmation Force Refer-
ence). Increase the setting
of Pn498 (Polarity Detec-
tion Allowable Error
Range). Increasing the
allowable error will also
increase the motor tem-
perature.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the Servomotor or
linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Continued from previous page.
Correction Reference
page 5-25
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Continued on next page.