YASKAWA SGDV-OFB03A Product Manual page 102

Error Lists
Errors in Semi-closed Loop Control with Linear Motors
Alarm Number: Alarm
Name (Alarm Description)
A.C91: Encoder Communi-
cations Position Data Accel-
eration Rate Error
A.C92: Encoder Communi-
cations Timer Error
A.CA0: Encoder Parameter
Error
A.CB0: Encoder Echoback
Error
102
Cause
n Corrosion caused by
improper temperature,
humidity, or gas.
n Short-circuit caused by
intrusion of water drops
or cutting oil.
n Connector contact fault
caused by vibration.
Malfunction caused by noise
interference.
A SERVOPACK fault
occurred.
The noise interference
occurred on the input/output
signal line because the
linear scale connection
cable is bent and the sheath
is damaged.
The encoder cable is bun-
dled with a high-current line
or near a high-current line.
Noise interference occurred
on the input/output signal
line from the linear scale.
Excessive vibration and
shocks were applied to the
linear scale.
A linear scale fault occurred. Turn the power supply OFF
The linear scale wiring and
contact are incorrect.
Noise interference occurred
due to incorrect linear scale
cable specifications.
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Sigma-5 and Sigma-7 Series SERVOPACKs
Investigative Actions
Check the operating envi-
ronment.
-
-
Check the cables and con-
nectors for linear scale.
Check the layout of the
linear scale connection
cable.
-
Check the operating envi-
ronment.
and then ON again.
Check the encoder wiring.
-
Corrective Actions
Improve the operating envi-
ronmental conditions, and
replace the cable. If the
alarm still occurs, replace
the SERVOPACK.
Correct the wiring around
the linear scale to avoid
noise interference (Separate
the linear scale connection
cables from the linear servo-
motor main circuit cable,
improve grounding, etc.)
Connect the linear servo-
motor to another SERVO-
PACK, and turn ON the con-
trol power. If no alarm
occurs, the SERVOPACK
may be faulty. Replace the
SERVOPACK.
Confirm that there is no
problem with the layout of
the linear scale connection
cable.
Confirm that there is no
surge voltage on the linear
scale connection cable.
Take countermeasures
against noise.
Reduce the machine vibra-
tion or correctly install the
linear servomotor.
If the alarm still occurs, the
linear servomotor may be
faulty. Replace the linear
servomotor.
Correct the linear scale
wiring.
Use tinned annealed copper
twisted pair or shielded
twisted-pair cable with a
core of at least 0.12 mm².