YASKAWA SGDV SERVOPACK, User Manual

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9 Troubleshooting
9.1.2 Troubleshooting of Alarms
9-16
A.C50:
Polarity Detection Er-
ror
(cont’d)
An external force was applied to
the motor coil assembly.

The polarity cannot be properly
detected if the detection reference is
0 (zero), but the speed feedback is
not 0 (zero) because of an external
force, such as cable tension, applied
to the motor coil assembly.

Take measures to reduce the exter-
nal force so that the speed feedback
becomes 0 for a 0 detection refer-
ence.

If external force cannot be reduced,
increase the value of the changes in
the sequence input signal allocation
for each signal (Pn481).
The linear scale resolution is too
low. Check the linear scale pitch to see if
it is within 100

m.
If the linear scale pitch is 100

m or
longer, the SERVOPACK cannot
detect the correct speed feedback.

Use a scale pitch with higher accu-
racy (a pitch within 40

m recom-
mended.) Or, increase the value of
the polarity detection reference
speed (Pn485). However, note that
increasing the value of Pn485 will
widen the servomotor movement
range required for polarity detec-
tion.
A.C51:
Overtravel
Detection at Polarity
Detection
An overtravel signal was detected
during polarity detection.
Check the position after overtravel.
Perform the wiring for an overtravel
signal. Execute polarity detection at
a position where an overtravel sig-
nal is not detected.
A.C52:

Polarity Detection Un-
completed
The servomotor has been turned
ON under the following circum-
stances.
• Polarity detection was not yet
complete.
• The /P-DET signal was not
input.

Input the /P-DET signal.
A.C53:
Out of Range for Po-
larity Detection
The moving distance exceeded
the set value of Pn48E in the mid-
dle of detection.

Increase the value of the polarity
detection range (Pn48E). Or,
increase the value of the changes in
the sequence input signal allocation
for each signal (Pn481).
A.C54:
Polarity Detection Er-
ror 2
External force was applied to the
servomotor.

Increase the value of the polarity
detection confirmation force refer-
ence (Pn495).
Increase the value of the polarity
detection allowable error range
(Pn498). Note that increasing the
allowable error will also increase
the motor temperature.
A.C80:
Absolute Encoder
Clear Error
A linear scale fault occurred.

Turn the power supply OFF and
then ON again. If the alarm still
occurs, the linear scale may be
faulty. Replace the linear scale.
A SERVOPACK fault occurred.

Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions