8.1 Alarm Displays
8.1.2 Troubleshooting Alarms
8-26
A.C20:
Phase Detection
Error
The linear encoder
signal level is too low.
Check the voltage of
the linear encoder sig-
nal.
Fine-tune the mounting of
the scale head. Or,
replace the linear
encoder.
–
The count-up direc-
tion of the linear
encoder does not
match the forward
direction of the Mov-
ing Coil in the motor.
Check the setting of
Pn080 = n.X
(Motor Phase Selec-
tion). Check the installa-
tion orientation for the
linear encoder and
Moving Coil.
Change the setting of
Pn080 = n.X.
Correctly reinstall the lin-
ear encoder or Moving
Coil.
*1
The polarity sensor
signal is being
affected by noise.
–
Correct the FG wiring.
Implement countermea-
sures against noise for the
polarity sensor wiring.
–
The setting of Pn282
(Linear Encoder Pitch)
is not correct.
Check the setting of
Pn282 (Linear Encoder
Pitch).
Check the specifications
of the linear encoder and
set a correct value.
*1
A.C21:
Polarity Sensor
Error
The polarity sensor is
protruding from the
Magnetic Way of the
motor.
Check the polarity sen-
sor.
Correctly reinstall the
Moving Coil or Magnetic
Way of the motor.
–
The polarity sensor is
not wired correctly.
Check the wiring of the
polarity sensor.
Correct the wiring of the
polarity sensor.
–
The polarity sensor
failed.
–
Replace the polarity sen-
sor.
–
A.C22:
Phase
Information
Disagreement
The SERVOPACK
phase information is
different from the lin-
ear encoder phase
information.
–
Perform polarity detec-
tion.
*1
Continued on next page.
Continued from previous page.
Alarm Number:
Alarm Name
Possible Cause Confirmation Correction Reference
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