15.2 Alarm Displays
15.2.2 Troubleshooting Alarms
15-28
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 Sequence
Selection). Check the
installation orientation
for the linear encoder
and Moving Coil.
Change the setting of
Pn080 = n.
X
.
Correctly reinstall the lin-
ear encoder or Moving
Coil.
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 Scale
Pitch) is not correct.
Check the setting of
Pn282 (Linear Encoder
Scale Pitch).
Check the specifications
of the linear encoder and
set a correct value.
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.
–
C22 hex:
Phase Informa-
tion Disagree-
ment
The SERVOPACK
phase information is
different from the lin-
ear encoder phase
information.
–
Perform polarity detec-
tion.
Continued on next page.
Continued from previous page.
Alarm Code:
Alarm Name
Possible Cause
Confirmation
Correction
Reference