9.1 Troubleshooting
9-13
9
A.C90
Encoder Com-
munications
Error
Occurred when the
control power sup-
ply was turned ON
or during opera-
tion
Incorrect encoder wiring and faulty contact
Correct the encoder wiring.
Noise interference due to improper encoder cable
specifications
Use tinned annealed copper twisted-pair wire
or twisted-pair shielded wire, wire with a core
at least 0.12 mm
2
(0.0002 in
2
).
Noise interference because the encoder cable
length is too long.
The maximum allowable wiring cable is 20 m
(65.6 ft).
A.C91
Encoder Com-
munications
Position Data
Error
Noise interference on the signal line because the
encoder cable is bent and the sheath is damaged.
Correct the encoder cable layout.
The encoder cable is bundled with a high-current
line or near a high-current line.
Correct the encoder cable layout so that no
surge is applied.
FG varies because of the influence from the ser-
vomotor side machines such as welder.
Make the grounding for the machine separately
from PG side FG.
A.C92
Encoder Com-
munications
Timer Error
Noise interference on the signal line from the
encoder
Take proper measures prevent noise sources
from coming within close contact of the
encoder wiring.
Excessive vibration and shocks to the encoder
Reduce the machine vibration or mount the
servomotor securely.
An Encoder fault occurred.
Replace the servomotor.
A SERVOPACK board fault occurred.
Replace the SERVOPACK
A.CA0
Encoder
Parameter
Error
Occurred when the
control power sup-
ply was turned ON
An Encoder fault occurred.
Replace the servomotor.
A SERVOPACK board fault occurred.
Replace the SERVOPACK.
A.Cb0
Encoder
Echoback Error
Occurred when the
control power sup-
ply was turned ON
or during opera-
tion
Encoder incorrect wiring and faulty contact
Correct the encoder wiring.
Noise interference due to improper encoder cable
specifications
Use tinned annealed copper twisted-pair wire
or twisted-pair shielded wire, wire with a core
at least 0.12 mm
2
(0.0002 in
2
).
Noise interference because the encoder cable
length is too long.
The maximum allowable wiring cable is 20 m
(65.6 ft).
Noise interference on the signal line because the
encoder cable is bent and the sheath is damaged.
Correct the encoder cable layout.
The encoder cable is bundled with a high-current
line or near a high-current line.
Correct the encoder cable layout so that no
surge is applied.
FG varies because of the influence from the ser-
vomotor side machines such as welder.
Ground the machine separately from PG side
FG.
Noise interference on the signal line from the
encoder
Take measures against noise for the encoder
wiring.
Excessive vibration and shocks to the encoder
Reduce the machine vibration or mount the
servomotor securely.
An Encoder fault occurred.
Replace the servomotor.
A SERVOPACK board fault occurred.
Replace the SERVOPACK
A.CC0
Multi-turn Limit
Disagreement
Occurred when the
control power sup-
ply was turned ON
Incorrect setting of parameters for the
SERVOPACK
Correct the setting of Pn205 (0 to 65535).
The multiturn limit value for the encoder is not
set or changed.
Execute Fn013 at the occurrence of alarm.
Occurred during
operation
A SERVOPACK board fault occurred.
Replace the SERVOPACK.
Table 9.3 Alarm Display and Troubleshooting (Cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause
Corrective Actions
SIEPS80000025.book 13 ページ 2004年10月25日 月曜日 午前11時57分