9.1 Alarm Displays
9-17
9
Trou
blesh
ooting
A.C92:
Encoder
Communications
Timer Error
Noise interference occurred on
the I/O signal line from the
encoder.
−
Take countermeasures against noise
for the encoder wiring.
Excessive vibration and shocks
were applied to the encoder.
Check the operating environment.
Reduce the machine vibration or
correctly install the servomotor.
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.
A.CA0:
Encoder Parameter
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.
A.Cb0:
Encoder Echoback
Error
The wiring and contact for
encoder cable are incorrect.
Check the wiring.
Correct the wiring.
Noise interference occurred due
to incorrect cable specifications
of encoder cable.
−
Use tinned annealed copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
core of at least 0.12 mm
2
.
Noise interference occurred
because the wiring distance for
the encoder cable is too long.
−
The wiring distance must be 50 m
max.
The FG potential varies because
of influence from machines on
the servomotor side, such as the
welder.
Check the cable layout for encoder
cable.
Properly ground the machines to
separate from encoder FG.
Excessive vibration and shocks
were applied to the encoder.
Check the operating environment.
Reduce the machine vibration or
correctly install the servomotor.
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.
A.CC0:
Multiturn Limit
Disagreement
The multiturn limit value of the
encoder is different from that of
the multi-winding drive unit. Or,
the multiturn limit value of the
multi-winding drive unit has been
changed.
Check the value of the Pn205 of the
multi-winding drive unit.
Execute Fn013 at the occurrence of
alarm.
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
