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9.1 Alarm Displays
9-15
A.C10:
Servo Overrun Detect-
ed
(Detected when the
servomotor power is
ON.
)
The order of phases U, V, and W
in the
servomotor wiring is incor-
rect.
Check the motor wiring.
Confirm that the servomotor is cor-
rectly wired.
The setting of the motor phase
selection (Pn080.1) is incorrect.
Check the setting of Pn080.1. Correct the setting of Pn080.1.
A linear scale fault occurred.
If the alarm still occurs after turning
t
he power OFF and then ON again,
even though the linear scale is cor-
rectly wired, the linear scale may be
fau
lty. Replace the linear scale.
A SERVOPACK fault occurred.
Turn the power supply OFF and
the
n ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
A.C20:
Phase Detection Error
The linear scale signal is weak.
Check the voltage of the
linear scale
signal.
Fine-adjust the installation status of
the
linear scale head, or replace the
linear scale.
The count-up direction of the lin-
ear scale does not match the for-
ward direction of the motor coil
assembly.
Check the setting of Pn080.1
(Motor Phase Selection).
Check the installation directions for
the
linear scale and motor coil
assembly.
Change the setting of Pn080.1
(Motor Phase
Selection).
Correctly reinstall the linear scale
and motor coil assembly.
The hall sensor signal is affected
by n
oise.
Correct the FG wiring and take
me
asures against noise for the hall
sensor wiring.
A.C21:
Hall Sensor Error
The hall sensor is protruding
from the motor magnetic way.
Check the hall sensor.
Correctly reinstall the motor coil
assembly or motor magnetic way.
The setting of the linear scale
pitch (Pn
282) is incorrect.
Check the setting of the linear scale
pitch (Pn282).
Check the specifications of the lin-
ear scale and correct the value of
Pn282.
The hall sensor wiring is incor-
rect.
Check the hall sensor wiring. Correct the hall sensor wiring.
A hall sensor fault occurred. Replace the hall sensor.
A.C22:
Phase Information
Disa
greement
The SERVOPACK phase data
does not match
that of the linear
scale.
Execute polarity detection (Fn080).
A.C50:
Polarity Detection Er-
ror
Parameter settings are incorrect.
Check the linear scale specifications
and feedback signal statu
s.
The settings of the l
inear scale pitch
(Pn282) and motor phase selection
(Pn080.1) may not match the actual
product requirements. Set these
parameters to the correct values.
Noise interference occurred on
t
he scale signal.
Check the wiring to see if:
• Each FG of the serial converter
unit
and servomotor is connected
to the FG of the SERVOPACK.
• The FG of the SERVOPACK is
con
nected to the FG of the power
supply.
• The linear scale connection
ca
bles are securely shielded.
Check to see if the detection
refer-
ence is repeatedly output in one
direction.
Take measures to avoid noise inter-
ference by correctly connecting FG
li
nes, shielding the linear scale con-
nection cables, etc.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause Investigative Actions Corrective Actions
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