YASKAWA SGD7S series Product Manual page 507

Alarm Number:
Possible Cause
Alarm Name
The linear encoder
signal level is too low.
The count-up direc-
tion of the linear
encoder does not
match the forward
A.C20:
direction of the Mov-
Phase Detection
ing Coil in the motor.
Error
The polarity sensor
signal is being
affected by noise.
The setting of Pn282
(Linear Encoder Scale
Pitch) is not correct.
The polarity sensor is
protruding from the
Magnetic Way of the
A.C21:
motor.
Polarity Sensor
The polarity sensor is
Error
not wired correctly.
The polarity sensor
failed.
The SERVOPACK
A.C22:
phase information is
Phase Informa-
different from the lin-
tion Disagree-
ear encoder phase
ment
information.
Confirmation
Fine-tune the mounting of
Check the voltage of
the scale head. Or,
the linear encoder sig-
replace the linear
nal.
encoder.
Check the setting of
Pn080 = n.X Change the setting of
(Motor Phase Sequence Pn080 = n.X.
Selection). Check the Correctly reinstall the lin-
installation orientation ear encoder or Moving
for the linear encoder Coil.
and Moving Coil.
Correct the FG wiring.
Implement countermea-
–
sures against noise for the
polarity sensor wiring.
Check the setting of Check the specifications
Pn282 (Linear Encoder of the linear encoder and
Scale Pitch). set a correct value.
Correctly reinstall the
Check the polarity sen-
Moving Coil or Magnetic
sor.
Way of the motor.
Check the wiring of the Correct the wiring of the
polarity sensor. polarity sensor.
Replace the polarity sen-
–
sor.
Perform polarity detec-
–
tion.
12.2 Alarm Displays
12.2.2 Troubleshooting Alarms
Continued from previous page.
Correction Reference
–
page 5-24
–
page 5-19
–
–
–
page 5-30
Continued on next page.
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