Troubleshooting For Polarity Detection Alarms With Linear Motors - YASKAWA SGDV-OFB03A Product Manual

Sigma-5 and Sigma-7 Series SERVOPACKs
Errors during Polarity Detection Functionality > Troubleshooting for Polarity Detection Alarms with Linear Motors
14.7.2

Troubleshooting for Polarity Detection Alarms with Linear Motors

Alarm Number: Alarm Name (Alarm
Description)
Polarity Detection Failure
A.C50
Overtravel Detected during Polarity
Detection
A.C51
Polarity Detection Not Completed
A.C52
Out of Range of Motion for Polarity
Detection
A.C53
Polarity Detection Failure 2
A.C54
| | Feedback Option Module Type 3 - Manual version C - Revision 0 | en |
Cause
Parameter settings are incorrect.
Noise is present in the scale signal.
The motor is being subjected to an
external force.
The resolution is rough.
The OT signal was detected.
Before the detection completes, Servo
ON signal was input.
The movement range during the
detection exceeds.
An external torque was applied.
Countermeasure
The settings of the resolution and
motor phase selection (Pn080.1) may
not be appropriate. Check the encoder
specifications and feedback signal con-
ditions.
When the command during the detec-
tion is repeatedly output several times
in the same direction, noise may occur
in the scale signal, resulting in malfunc-
tion. Check the connection to earth
ground and the encoder cable.
The external force prevents the SER-
VOPACK from executing the function.
n Reduce the external force.
n If not possible, increase the value
of speed loop gain (Pn481).
The SERVOPACK cannot detect cor-
rect speed feedback.
n Use the recommended resolution.
n Alternatively, increase the value of
command speed (Pn493). How-
ever, the movement range will
increase.
This alarm occurs when the OT signal
is detected during the function. Before
executing the function, place the motor
to the position where the OT signal is
not detected.
Analog Pulse Model
n Input the /P-DET signal.
MECHATROLINK and Network Option
Model
n When using an absolute encoder,
set Pn587.0 = 1 in order to execute
the function.
If the range (Pn48E) has not been
changed from default value, the motor
might have been moved for some
reason. Check for the cause and take
proper measure.
n Increase the value of confirmation
torque command (Pn495).
n Increase the value of allowable
error range (Pn498).
Note: Increasing the error range will
also increase the motor temperature.
Error Lists
107