YASKAWA Sigma-7 SGD7S Series - Page 618

Alarm Code Alarm Name Possible Cause Confirmation Correction Reference
The count-up direction
of the linear encoder
does not match the
forward direction of
the Moving Coil in the
motor.
Check the setting of
Pn080 = n.X
(Motor Phase
Sequence Selec-
tion). Check the
installation orienta-
tion for the linear
encoder and Moving
Coil.
Change the setting
of Pn080 =
n.X. Correctly
reinstall the linear
encoder or Moving
Coil.
Ä Chap. 6.8
‘Selecting the
Phase
Sequence for a
Linear Servo-
motor’ page 154
The polarity sensor
signal is being
affected by noise.
– Correct the FG
wiring. Implement
countermeasures
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 specifica-
tions of the linear
encoder and set a
correct value.
Ä Chap. 6.6
‘Setting the
Linear Encoder
Pitch’ page 146
A.C21
(1C21h)
Polarity Sensor
Error
The polarity sensor is
protruding from the
Magnetic Way of the
motor.
Check the polarity
sensor.
Correctly reinstall the
Moving Coil or Mag-
netic 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
sensor.
–
A.C22
(1C22h)
Phase Informa-
tion Disagree-
ment
The SERVOPACK
phase information is
different from the
linear encoder phase
information.
– Perform polarity
detection.
Ä Chap. 6.10.4
‘Using a Tool
Function to Per-
form Polarity
Detection’
page 158
A.C50
(1C50h)
Polarity Detec-
tion Failure
The parameter set-
tings are not correct.
Check the linear
encoder specifica-
tions and feedback
signal status.
The settings of
Pn282 (Linear
Encoder Pitch) and
Pn080 = n.X
(Motor Phase Selec-
tion) may not match
the installation. Set
the parameters to
correct values.
Ä Chap. 6.6
‘Setting the
Linear Encoder
Pitch’ page 146,
Ä Chap. 6.8
‘Selecting the
Phase
Sequence for a
Linear Servo-
motor’ page 154
Sigma-7 Series SERVOPACKs
Maintenance
Alarm Displays > Troubleshooting Alarms
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