YASKAWA SGD7S-xxxDA0 series Product Manual page 538

16.2 Alarm Displays
16.2.2 Troubleshooting Alarms
Alarm Code:
Alarm Name
C51h:
Overtravel
Detected during
Polarity Detection
C52h:
Polarity Detec-
tion Not Com-
pleted
C53h:
Out of Range of
Motion for Polarity
Detection
C54h:
Polarity Detec-
tion Failure 2
C80h:
Encoder Clear
Error or Multiturn
Limit Setting Error
16-32
Possible Cause
The overtravel signal
Check the overtravel
was detected during
position.
polarity detection.
The servo was turned
ON when using an
absolute linear
encoder, Pn587
(2587h) was set to –
n.0 (Do not
detect polarity), and
the polarity had not
been detected.
The travel distance
exceeded the setting
of Pn48E (248Eh)
–
(Polarity Detection
Range) in the middle
of detection.
An external force was
applied to the Servo- –
motor.
A failure occurred in
–
the encoder.
A failure occurred in
–
the SERVOPACK.
Confirmation
Wire the overtravel sig-
nals. Execute polarity
detection at a position
where an overtravel sig-
nal would not be
detected.
When using an absolute
linear encoder, set Pn587
(2587h) to n.1
(Detect polarity)
Increase the setting of
Pn48E (248Eh) (Polarity
Detection Range). Or,
increase the setting of
Pn481 (2481h) (Polarity
Detection Speed Loop
Gain).
Increase the setting of
Pn495 (2495h) (Polarity
Detection Confirmation
Force Reference).
Increase the setting of
Pn498 (2498h) (Polarity
Detection 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 4-31
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Continued on next page.