Yaskawa Sigma-5 User Manual: Design and Maintenance - Linear Motors - Manual (Page 267)

8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-16
A.C50:
Polarity Detection
Error
Parameter settings are incorrect.
Check the linear scale specifications
and feedback signal status.
The settings of the linear scale pitch
(Pn282) and motor phase selection
(Pn080.1) may not match the actual
product requirements. Set these
parameters to the correct values.
Noise interference occurred on
the scale signal.
Check the wiring to see if:
• Each FG of the serial converter
unit and linear servomotor is con-
nected to the FG of the SERVO-
PACK.
• The FG of the SERVOPACK is
connected to the FG of the power
supply.
• The linear scale connection
cables are securely shielded.
Check to see if the detection refer-
ence is repeatedly output in one
direction.
Take measures to avoid noise inter-
ference by correctly connecting FG
lines, shielding the linear scale con-
nection cables, etc.
An external force was applied to
the motor moving coil.
−
The polarity cannot be properly
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 exter-
nal force so that the speed feedback
becomes 0 for a 0 detection refer-
ence.
If external force cannot be reduced,
increase the polarity detection speed
loop gain (Pn481).
The linear scale resolution is too
low. Check the linear scale pitch to see if
it is within 100
μm.
If the linear scale pitch is 100 μm or
longer, the SERVOPACK cannot
detect the correct speed feedback.
Use a scale pitch with higher accu-
racy (a pitch within 40
μm recom-
mended.) Or, increase the value of
the polarity detection reference
speed (Pn485). However, note that
increasing the value of Pn485 will
widen the linear servomotor move-
ment range required for polarity
detection.
A.C51:
Overtravel
Detection at Polarity
Detection
An overtravel signal was detected
during polarity detection.
Check the position after overtravel.
Perform the wiring for an overtravel
signal. Execute polarity detection at
a position where an overtravel sig-
nal is not detected.
A.C52:
Polarity Detection
Uncompleted
The servo has been turned ON
under the following circum-
stances.
• An absolute linear scale is
being used.
• The polarity detection selection
for the absolute linear scale
was set to not execute.
(Pn587.0 = 0)
• Polarity was not yet detected.
−
When using an absolute linear
scale, set the parameter Pn587.0 to
1 to execute polarity detection.
A.C53:
Out of Range for
Polarity Detection
The movement distance exceeded
the set value of Pn48E in the mid-
dle of detection.
−
Increase the value of the polarity
detection range (Pn48E). Or,
increase the polarity detection speed
loop gain (Pn481).
Alarm:
Alarm Name
Cause Investigative Actions Corrective Actions