8 Troubleshooting
8.1.2 Troubleshooting of Alarms
8-16
A.bF2:
System Alarm 2
A fault occurred in the multi-
winding drive unit.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
A.bF3
:
System Alarm 3
A fault occurred in the multi-
winding drive unit.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
A.bF4:
System Alarm 4
A fault occurred in the multi-
winding drive unit.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
A.C10:
Servo Overrun
Detected
(Detected when the
servomotor power is
ON.)
The order of phases U, V, and W
in the servomotor wiring is incor-
rect.
Check the motor wiring.
Confirm that the servomotor is cor-
rectly wired.
An encoder fault occurred.
−
If the alarm still occurs after turning
the control power supply OFF and
ON again even though the servomo-
tor is correctly wired, the servomo-
tor may be faulty. Replace the
servomotor.
A fault occurred in the multi-
winding drive unit, SERVO-
PACK, or converter.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive
unit, SERVOPACK or converter
may be faulty. Replace the multi-
winding drive unit, SERVOPACK,
or converter.
A.C80:
Absolute Encoder
Clear Error and
Multi-turn Limit Set-
ting Error
An encoder fault occurred.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the servomotor may be
faulty. Replace the servomotor.
A fault occurred in the multi-
winding drive unit.
−
Turn the control power supply OFF
and ON again. If the alarm still
occurs, the multi-winding drive unit
may be faulty. Replace the multi-
winding drive unit.
(cont’d)
Alarm Number:
Alarm Name
(Alarm Description)
Cause
Investigative Actions
Corrective Actions