14.7 Errors during Polarity Detection Functionality
Alarm Number: Alarm
Name (Alarm Description)
Cause Investigative Actions Corrective Actions
A.C22: Phase Information
Disagreement
The SERVOPACK phase
data does not match that of
the linear scale.
- Execute polarity detection
(Fn080).
A.C50: Polarity Detection
Failure
Parameter settings are
incorrect.
Check the linear scale spec-
ifications and feedback
signal status.
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
Noise interference occurred
on the scale signal.
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.
n The linear scale connec-
tion cables are securely
shielded.
Check to see if the detection
reference is repeatedly
output in one direction.
Take measures to avoid
noise interference by cor-
rectly connecting FG lines,
shielding the linear scale
connection cables, etc.
An external force was
applied to the motor moving
coil.
- 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).
Sigma-5 and Sigma-7 Series SERVOPACKs
Error Lists
Errors during Polarity Detection Functionality
| | Feedback Option Module Type 3 - Manual version C - Revision 0 | en | 104
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