YASKAWA SGD7S-1R9D Product Manual page 510

15.2 Alarm Displays
15.2.2 Troubleshooting Alarms
Alarm Code:
Alarm Name
C51 hex:
Overtravel
Detected during
Polarity Detection
C52 hex:
Polarity Detec-
tion Not Com-
pleted
C53 hex:
Out of Range of
Motion for Polarity
Detection
C54 hex:
Polarity Detec-
tion Failure 2
C80 hex:
Encoder Clear
Error or Multiturn
Limit Setting Error
15-30
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 (2587
hex) was set to –
n.0 (Do not
detect polarity), and
the polarity had not
been detected.
The travel distance
exceeded the setting
of Pn48E (248E hex)
–
(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
(2587 hex) to n.1
(Detect polarity)
Increase the setting of
Pn48E (248E hex) (Polar-
ity Detection Range). Or,
increase the setting of
Pn481 (2481 hex) (Polarity
Detection Speed Loop
Gain).
Increase the setting of
Pn495 (2495 hex) (Polarity
Detection Confirmation
Force Reference).
Increase the setting of
Pn498 (2498 hex) (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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