YASKAWA Sigma-7 SGD7S Series - Page 620

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
The linear encoder
resolution is too low.
Check the linear
encoder scale pitch
to see if it is within
100 μm.
If the linear encoder
scale pitch is 100 μm
or higher, the SER-
VOPACK cannot
detect the correct
speed feedback. Use
a linear encoder
scale pitch with
higher resolution.
(We recommend a
pitch of 40 μm or
less.) Or, increase
the setting of Pn485
(Polarity Detection
Reference Speed).
However, increasing
the setting of Pn485
will increase the Ser-
vomotor movement
range that is required
for polarity detection.
–
A.C51
(1C51h)
Overtravel
Detected during
Polarity Detec-
tion
The overtravel signal
was detected during
polarity detection.
Check the overtravel
position.
Wire the overtravel
signals. Execute
polarity detection at
a position where an
overtravel signal
would not be
detected.
Ä Chap. 5.6.3
‘I/O Signal
Wiring Exam-
ples’ page 120
A.C52
(1C52h)
Polarity Detec-
tion Not Com-
pleted
The servo was turned
ON when using an
absolute linear
encoder, Pn587 was
set to n.0 (Do
not detect polarity),
and the polarity had
not been detected.
– When using an abso-
lute linear encoder,
set Pn587 to
n.1 (Detect
polarity)
–
A.C53
(1C53h)
Out of Range of
Motion for
Polarity Detec-
tion
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 set-
ting of Pn481
(Polarity Detection
Speed Loop Gain).
–
A.C54
(1C54h)
Polarity Detec-
tion Failure 2
An external force was
applied to the Servo-
motor.
– Increase the setting
of Pn495 (Polarity
Detection Confirma-
tion Force Refer-
ence). Increase the
setting of Pn498
(Polarity Detection
Allowable Error
Range). Increasing
the allowable error
will also increase the
motor temperature.
–
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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