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Error Lists
Errors during Polarity Detection Functionality
14.7
Errors during Polarity Detection Functionality
Alarm Number: Alarm
Name (Alarm Description)
A.C22: Phase Information
Disagreement
A.C50: Polarity Detection
Failure
104
Cause
The SERVOPACK phase
data does not match that of
the linear scale.
Parameter settings are
incorrect.
Noise interference occurred
on the scale signal.
An external force was
applied to the motor moving
coil.
| | Feedback Option Module Type 3 - Manual version C - Revision 0 | en |
Sigma-5 and Sigma-7 Series SERVOPACKs
Investigative Actions
-
Check the linear scale spec-
ifications and feedback
signal status.
Check the wiring to see if:
n
Each FG of the encoder
unit and linear servo-
motor is connected to
the FG of the SERVO-
PACK.
n
The FG of the SERVO-
PACK is connected to
the FG of the power
supply.
The linear scale connec-
n
tion cables are securely
shielded.
Check to see if the detection
reference is repeatedly
output in one direction.
-
Corrective Actions
Execute polarity detection
(Fn080).
The settings of the linear
scale pitch (Pn282) and
motor phase selection
(Pn080.1) may not match
the actual product require-
ments. Set these parame-
ters to the correct values
Take measures to avoid
noise interference by cor-
rectly connecting FG lines,
shielding the linear scale
connection cables, etc.
The polarity cannot be prop-
erly detected if the detection
reference is 0 (zero), but the
speed feedback is not 0
(zero) because of an
external force, such as
cable tension, applied to the
motor moving coil. Take
measures to reduce the
external force so that the
speed feedback becomes 0
for a 0 detection reference.
If external force cannot be
reduced, increase the
polarity detection speed
loop gain (Pn481).
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Troubleshooting
