YASKAWA SGMAS User Manual page 154

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