YASKAWA E-V-MD Series User Manual page 271

Alarm Number:
Alarm Name
(Alarm Description)
A.bF1:
A SERVOPACK fault occurred.
System Alarm 1
A.bF2:
A SERVOPACK fault occurred.
System Alarm 2
:
A.bF3
A SERVOPACK fault occurred.
System Alarm 3
A.bF4:
A SERVOPACK fault occurred.
System Alarm 4
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
A.C10:
Servo Overrun
Detected
An encoder fault occurred.
(Detected when the
servomotor power is
ON.)
A SERVOPACK fault occurred.
A.C80:
Absolute Encoder
An encoder fault occurred.
Clear Error and Multi-
turn Limit Setting Error
Contact fault of connector or
incorrect wiring for encoder
cable.
Cable disconnection for encoder
cable or short-circuit.
Or, incorrect cable impedance.
A.C90:
Corrosion caused by improper
Encoder
temperature, humidity, or gas,
Communications Error
short-circuit caused by intrusion
of water drops or cutting oil, or
connector contact fault caused by
vibration.
Malfunction caused by noise
interference.
Noise interference occurred on
the I/O signal line because the
encoder cable is bent and the
sheath is damaged.
A.C91:
The encoder cable is bundled
Encoder
with a high-current line or near a
Communications
high-current line.
Position Data Error
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Cause Investigative Actions
−
−
−
−
Check the motor wiring.
−
−
−
Check the connector contact status
for encoder cable.
Check the encoder cable.
Check the operating environment.
−
Check the encoder cable and con-
nector.
Check the cable layout for encoder
cable.
Check the cable layout for encoder
cable.
10.2 Alarm Displays
(cont'd)
Corrective Actions
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Restart the SERVOPACK. 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 restart-
ing the SERVOPACK, even though
the servomotor is correctly wired,
the servomotor may be faulty.
Replace the servomotor.
Restart the SERVOPACK. If the
alarm still occurs, the SERVO-
PACK may be faulty. Replace the
SERVOPACK.
Restart the SERVOPACK. If the
alarm still occurs, the servomotor
may be faulty. Replace the servo-
motor.
Re-insert the connectors and con-
firm that the encoder is correctly
wired.
Use the cables 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 (e.g., grounding).
Confirm that there is no problem
with the cable layout.
Confirm that there is no surge volt-
age on the cables.
Properly ground the machines to
separate from the encoder FG.
10
10-11