YASKAWA E-7S SERVOPACK SGD7S - Page 543

15.2 Alarm Displays
15.2.2 Troubleshooting Alarms
15-32
A.C51:
Overtravel
Detected during
Polarity Detection
The overtravel signal
was detected during
polarity detection.
Check the overtravel
position.
Wire the overtravel sig-
nals. Execute polarity
detection at a position
where an overtravel sig-
nal would not be
detected.
page 4-36
A.C52:
Polarity Detec-
tion Not Com-
pleted
The servo was turned
ON under the follow-
ing circumstances.
• When an absolute
scale was in use
• When polarity
detection was not
completed
–
Execute polarity detec-
tion (with the SigmaWin+
or Digital Operator,
Fn080).
–
A.C53:
Out of Range of
Motion for Polar-
ity Detection
The travel distance
exceeded the setting
of Pn48E (Polarity
Detection Range) in
the middle of detec-
tion.
–
Increase the setting of
Pn48E (Polarity Detection
Range). Or, increase the
setting of Pn481 (Polarity
Detection Speed Loop
Gain).
–
A.C54:
Polarity Detec-
tion Failure 2
An external force was
applied to the Servo-
motor.
–
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.
–
A.C80:
Encoder Clear
Error or Multiturn
Limit Setting Error
A failure occurred in
the encoder.
–
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.
–
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
SERVOPACK.
–
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction Reference