Yaskawa Sigma II Series DC Power Input SGMAJ - Manual (Page 291)

10 Inspection, Maintenance, and Troubleshooting
10.1.3 Troubleshooting of Alarm and Warning
10-10
A.C8 Absolute
Encoder Clear
Error and Multi-
turn Limit Set-
ting 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.
Occurred when an
encoder alarm was
cleared and reset. An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.C9 Encoder
Communica-
tions Error Occurred when the
control power sup-
ply was turned ON
or during operation. The encoder wiring and the contact are incorrect. Correct the encoder wiring.
Noise interference occurred due to incorrect encoder
cable specifications. Use tinned annealed copper twisted-pair or
twisted-pair shielded wire with a core of at least
0.12 mm
2 (0.0002 in 2 ).
Noise interference occurred because the wiring dis-
tance for the encoder cable is too long. The wiring distance must be 20m (65.6 ft) max.
The noise interference occurred 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.
The FG electrical potential varies because of the
influence from such machines on the servomotor
side as welders. Ground the machine separately from PG side FG.
Noise interference occurred on the signal line from
the encoder. Take a measure against noise for the encoder wir-
ing.
Excessive vibration and shocks were applied to the
encoder. Reduce the machine vibration or mount the servo-
motor securely.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.CA 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.Cb Encoder
Echoback Error Occurred when the
control power sup-
ply was turned ON
or during operation. The encoder wiring and contact are incorrect. Correct the encoder wiring.
Noise interference occurred due to incorrect encoder
cable specifications. Use tinned annealed copper twisted-pair or
twisted-pair shielded wire with a core of at least
0.12 mm
2 (0.0002 in 2 ).
Noise interference occurred because the wiring dis-
tance for the encoder cable is too long. The wiring distance must be 20m (65.6 ft) max.
Noise interference occurred 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.
The FG electrical potential varies because of the
influence from such machines on the servomotor
side as welders. Ground the machine separately from PG side FG.
Noise interference occurred on the signal line from
the encoder. Take measures against noise for the encoder wir-
ing.
Excessive vibration and shocks to the encoder was
applied. Reduce the machine vibration or mount the servo-
motor securely.
An encoder fault occurred. Replace the servomotor.
A SERVOPACK board fault occurred. Replace the SERVOPACK.
A.CC Multiturn Limit
Disagreement Occurred when the
control power sup-
ply was turned ON. The parameter settings for the SERVOPACK are
incorrect. Correct the setting of Pn205 (0 to 65535).
The multiturn limit value for the encoder is not set or
was changed. Execute Fn013 at the occurrence of alarm.
Occurred during
normal operation. A SERVOPACK board fault occurred. Replace the SERVOPACK.
Table 10.3 Alarm Display and Troubleshooting (cont’d)
Alarm
Display
Alarm Name
Situation at Alarm
Occurrence
Cause Corrective Actions