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Alarm Number:
Possible Cause
Alarm Name
The order of phases
U, V, and W in the
motor wiring is not
correct.
There is an error in the
setting of Pn080 =
n.X (Motor
Phase Sequence
Selection).
A.C10:
Servomotor Out
of Control
(Detected when
A failure occurred in
the servo is
the encoder.
turned ON.)
A failure occurred in
the SERVOPACK.
The linear encoder
signal level is too low.
The count-up direc-
tion of the linear
A.C20:
encoder does not
Phase Detection
match the forward
Error
direction of the Mov-
ing Coil in the motor.
The polarity sensor
signal is being
affected by noise.
The polarity sensor is
protruding from the
Magnetic Way of the
motor.
The setting of Pn282
A.C21:
(Linear Encoder Scale
Polarity Sensor
Pitch) is not correct.
Error
The polarity sensor is
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
Check the Servomotor
Make sure that the Servo-
wiring.
motor is correctly wired.
Check the setting of
Pn080 = n.X.
If the motor wiring is cor-
rect and an alarm still
occurs after turning the
power supply OFF and
–
ON again, the Servomotor
or linear encoder may be
faulty. Replace the Servo-
motor or linear encoder.
Turn the power supply to
the SERVOPACK OFF and
ON again. If an alarm still
–
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Fine-tune the mounting of
Check the voltage of the
the scale head. Or,
linear encoder signal.
replace the linear
encoder.
Check the setting of
Pn080 = n.X (Motor
Change the setting of
Phase Sequence Selec-
Pn080 = n.X.
tion). Check the installa-
tion orientation for the
linear encoder and Mov-
ing Coil.
Correct the FG wiring.
Implement countermea-
–
sures against noise for the
polarity sensor wiring.
Correctly reinstall the
Check the polarity sensor.
Moving Coil or Magnetic
Way of the motor.
Check the setting of
Check the specifications
Pn282 (Linear Encoder
of the linear encoder and
Scale Pitch).
set a correct value.
Check the wiring of the
Correct the wiring of the
polarity sensor.
polarity sensor.
Replace the polarity sen-
–
sor.
Perform polarity detec-
–
tion.
5.3 Troubleshooting Alarms
Continued from previous page.
Correction
–
Set Pn080 = n.X to
*1
an appropriate value.
–
–
–
*1
Correctly reinstall the lin-
ear encoder or Moving
Coil.
–
–
*1
–
–
*1
Continued on next page.
Refer-
ence
5
5-25
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Table of Contents
Troubleshooting
