YASKAWA SGMJV User Manual page 315

9 Troubleshooting
9.1.2 Troubleshooting of Alarms
Alarm Number:
Alarm Name
A.bF2:
System Alarm 2
:
A.bF3
System Alarm 3
A.bF4:
System Alarm 4
A.C10:
Servo Overrun
Detected
(Detected when the
servomotor power is
ON.)
A.C80:
Absolute Encoder
Clear Error and
Multi-turn Limit Set-
ting Error
A.C90:
Encoder
Communications Error
9-16
Cause
A SERVOPACK fault occurred.
A SERVOPACK fault occurred.
A SERVOPACK fault occurred.
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
An encoder fault occurred.
A SERVOPACK fault occurred.
An encoder fault occurred.
A SERVOPACK fault occurred.
Contact fault of connector or
incorrect wiring for encoder
cable.
Cable disconnection for encoder
cable 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, or
connector contact fault caused by
vibration.
Malfunction caused by noise
interference.
A SERVOPACK fault occurred.
Investigative Actions
−
−
−
Check the motor wiring.
−
−
−
−
Check the connector contact status
for encoder cable.
Check the encoder cable.
Check the operating environment.
−
−
(cont'd)
Corrective Actions
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Confirm that the servomotor is cor-
rectly wired.
If the alarm still occurs after turning
the power OFF and then ON again,
even though the servomotor is cor-
rectly wired, the servomotor may be
faulty. Replace the servomotor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Turn the power supply to the SER-
VOPACK OFF and ON again. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Re-insert the connector and confirm
that the encoder is correctly wired.
Use the cable with the specified rat-
ing.
Improve the operating environmen-
tal conditions, and replace the cable.
If the alarm still occurs, replace the
SERVOPACK.
Correct the wiring around the
encoder by separating the encoder
cable from the servomotor main cir-
cuit cable or by checking the
grounding and other wiring.
Connect the servomotor to another
SERVOPACK, and turn ON the
control power. If no alarm occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.