Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
Excessive vibration and
shocks were applied to the
encoder.
Check the operating envi-
ronment.
Reduce the machine vibra-
tion or correctly install the
servomotor.
A.CA0: Encoder Parameter
Error
Feedback option card is not
configured.
-
Contact YASKAWA to
receive a valid configuration
file. Copy to feedback option
card. Power cycle.
A.CB0: Encoder Echoback
Error
The encoder wiring and con-
tact are incorrect.
Check the encoder wiring.
Correct the encoder wiring.
Noise interference occurred
due to incorrect encoder
cable specifications.
Check the encoder wiring.
Use tinned annealed copper
twisted pair or shielded
twisted-pair cable with a
core of at least 0.12 mm².
Noise interference occurred
because the wiring distance
for the encoder cable is too
long.
Check the encoder wiring.
The wiring distance must be
20 m max.
A.CC0: Multiturn Limit Disa-
greement
Different multiturn limits
have been set in the
encoder and the SERVO-
PACK.
Check the value of the multi-
turn limit value (Pn205).
Correct the setting of Pn205
(0 to 65535).
A.D30: Position Data Over-
flow
The multi-turn position data
ex/-32767.
-
Correct the setting (-32767
to +32767)
14.5 Errors in Semi-closed Loop Control with Linear Motors
Alarm Number: Alarm
Name (Alarm Description)
Cause
Investigative Actions
Corrective Actions
A.041: Encoder Output
Pulse Setting Error
The setting of Pn281
(Encoder Output Resolution)
is outside of the setting
range or does not satisfy the
setting conditions.
Check the parameter
Pn281.
Set Pn281 to a correct
value.
A.511: Encoder Output
Pulse Overspeed
n
Linear Servomotor: The
motor speed upper limit
for the setting of Pn281
(Encoder Output Reso-
lution) was exceeded.
Check the encoder output
resolution output setting.
Decrease the setting of the
encoder output resolution
(Pn281).
A.550: Maximum Speed
Setting Error
The setting of Pn385 (Max-
imum Motor Speed) is
greater than the maximum
motor speed.
-
Decrease the setting for
Pn385.
A.820: Encoder Checksum
Alarm
A linear scale fault occurred. -
Set up the linear scale again
using Fn008. If the alarm
still occurs, the linear servo-
motor may be faulty.
Replace the linear servo-
motor.
Sigma-5 and Sigma-7 Series SERVOPACKs
Error Lists
Errors in Semi-closed Loop Control with Linear Motors
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