Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
Noise interference occurred
because the wiring distance
for the linear scale cable is
too long.
-
The wiring distance must be
20 m max.
A.D30: Position Data Over-
flow
The multi-turn position data
ex/-32767.
-
Correct the setting (-32767
to +32767)
14.6 Errors with Pole Sensor Signals Interface
Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
A.840: Encoder Data Alarm
An encoder fault occurred
Turn the power supply OFF
and then ON again.
If the alarm still occurs, the
servomotor may be faulty.
Replace the servomotor.
Malfunction of encoder
because of noise interfer-
ence, etc.
-
Correct the wiring around
the encoder by separating
the encoder cable from the
servomotor main circuit
cable or by checking the
grounding and other wiring.
Note: If the scale file is configured for Hall sensor connectivity, a Hall sensor must be con-
nected. Disabling Hall sensor connectivity (Pn080.0 = 1) and trying to work without the
sensor will cause error A.840.
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 linear scale does not
match the forward direction
of the motor moving coil.
Check the setting of
Pn080.1 (Motor Phase
Sequence Selection). Check
the installation directions for
the linear scale and motor
moving coil.
Change the setting of
Pn080.1 (Motor Phase
Sequence Selection). Cor-
rectly reinstall the linear
scale and motor moving coil.
The hall sensor signal is
affected by noise.
-
Correct the FG wiring and
take measures against
noise for the hall sensor
wiring.
A.C21: Polarity Sensor Error An error occurred in the
polarity sensor.
-
Replace the polarity sensor.
Sigma-5 and Sigma-7 Series SERVOPACKs
Error Lists
Errors with Pole Sensor Signals Interface
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