YASKAWA UAK series User Manual page 281

Alarm:
Alarm Name
An attempt was made to detect
the magnetic pole for the high-
speed winding (for motors with a
A.C52:
winding selection).
Polarity Detection
An attempt was made to detect
Uncompleted
the magnetic pole when changing
the winding (for motors with a
winding selection).
The travel distance during mag-
C53:
netic pole detection exceeded the
Out of Range for
magnetic pole detection travel
Polarity Detection
range in Pn494.
The motor's electrical angle dur-
C54:
ing magnetic pole detection con-
Polarity Detection firmation exceeded the magnetic
Error 2 pole detection allowable devia-
tion range in Pn498.
Encoder failure
A.C80:
Absolute Encoder
Clear Error
(Multiturn Limit Setting
Error)
SERVOPACK failure
Contact fault of encoder connec-
tor or incorrect encoder wiring.
Encoder cable disconnection or
short-circuit.
Or, incorrect cable impedance.
Corrosion caused by improper
temperature, humidity, or gas
Short-circuit caused by intrusion
of water drops or cutting oil
A.C90:
Connector contact fault caused by
Encoder
vibration.
Communications Error
Malfunction caused by noise
interference.
SERVOPACK failure
Cause Investigative Actions
−
−
−
−
−
Check the encoder connector con-
tact status.
Check the encoder cable.
Check the operating environment.
−
−
11.2 Alarm Displays
(cont'd)
Corrective Actions
Perform magnetic pole detection for
the low-speed winding.
Increase the magnetic pole detec-
tion travel range in Pn494.
Increase the magnetic pole detec-
tion speed loop gain in Pn481.
Increase the magnetic pole detec-
tion confirmation torque in Pn495.
Increase the magnetic pole detec-
tion allowable deviation range in
Pn498 (however, a motor overheat-
ing alarm or overload alarm may
occur).
Reduce the external force on the
motor's stator to about 10% or less
of the motor's rated torque.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply OFF and
then ON again. If the alarm still
occurs, the SERVOPACK may be
faulty. Replace the SERVOPACK.
Re-insert the encoder connector and
confirm that the encoder is correctly
wired.
Use the encoder cable with the
specified rating.
Improve the operating environmen-
tal conditions, and replace the cable.
If the alarm still occurs, replace the
SERVOPACK.
Correct the wiring around the
encoder to avoid noise interference
(Separate the encoder cable from
the servomotor main circuit cable,
improve grounding, etc.)
Connect the servomotor to another
SERVOPACK, and turn ON the
control power. If no alarm occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
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