Errors With Pole Sensor Signals Interface - YASKAWA SGDV-OFB03A Product Manual

Sigma-5 and Sigma-7 Series SERVOPACKs
Alarm Number: Alarm
Name (Alarm Description)
A.D30: Position Data Over-
flow
14.6

Errors with Pole Sensor Signals Interface

Alarm Number: Alarm
Name (Alarm Description)
A.840: Encoder Data Alarm
A.C20: Phase Detection
Error
A.C21: Polarity Sensor Error An error occurred in the
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Cause
Noise interference occurred
because the wiring distance
for the linear scale cable is
too long.
The multi-turn position data
exceeded +/-32767.
Cause
An encoder fault occurred
Malfunction of encoder
because of noise interfer-
ence, etc.
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.
The linear scale signal is
weak.
The count-up direction of
the linear scale does not
match the forward direction
of the motor moving coil.
The hall sensor signal is
affected by noise.
polarity sensor.
Errors with Pole Sensor Signals Interface
Investigative Actions
-
-
Investigative Actions
Turn the power supply OFF
and then ON again.
-
Check the voltage of the
linear scale signal.
Check the setting of
Pn080.1 (Motor Phase
Sequence Selection). Check
the installation directions for
the linear scale and motor
moving coil.
-
-
Error Lists
Corrective Actions
The wiring distance must be
20 m max.
Correct the setting (-32767
to +32767)
Corrective Actions
If the alarm still occurs, the
servomotor may be faulty.
Replace the servomotor.
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.
Fine-adjust the installation
status of the linear scale
head, or replace the linear
scale.
Change the setting of
Pn080.1 (Motor Phase
Sequence Selection). Cor-
rectly reinstall the linear
scale and motor moving coil.
Correct the FG wiring and
take measures against
noise for the hall sensor
wiring.
Replace the polarity sensor.
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