14.7.1 Troubleshooting for Polarity Detection Alarms with Rotary Motors
Alarm Number: Alarm Name (Alarm
Description)
Cause Countermeasure
Polarity Detection Failure
A.C50
Parameter settings are incorrect. The settings of the resolution and
motor phase selection (Pn080.1) may
not be appropriate. Check the encoder
specifications and feedback signal con-
ditions.
Noise is present in the scale signal. 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 motor is being subjected to an
external torque.
The external torque prevents the SER-
VOPACK from executing the function.
n Reduce the external torque.
n If not possible, increase the value
of speed loop gain (Pn481).
The resolution is rough. 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.
Overtravel Detected during Polarity
Detection
A.C51
The OT signal was detected. 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.
Polarity Detection Not Completed
A.C52
Before the detection completes, Servo
ON signal was input.
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.
Out of Range of Motion for Polarity
Detection
A.C53
The movement range during the
detection exceeds.
If the range (Pn494) has not been
changed from default value, the motor
might have been moved for some
reason. Check for the cause and take
proper measure.
Polarity Detection Failure 2
A.C54
An external torque was applied.
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.
Sigma-5 and Sigma-7 Series SERVOPACKs
Error Lists
Errors during Polarity Detection Functionality > Troubleshooting for Polarity Detection Alarms with Rotary Motors
| | Feedback Option Module Type 3 - Manual version C - Revision 0 | en | 106
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