YASKAWA E-7-Series SGD7S - Page 454

12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
12-31
12
Maintenance
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 4-31
A.C52:
Polarity Detec-
tion Not Com-
pleted
The servo was turned
ON under the follow-
ing circumstances.
• Before polarity
detection was com-
pleted
• Before /P-DET was
input
– Input the /P-DET signal.
page 5-28
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 temperature.
–
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 Servomotor
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 SERVO-
PACK.
–
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction
Reference
for Correc-
tion