YASKAWA SGDV-180A - Page 13

A.C90
Encoder
Communications
Error
humidity, or gas, short-
circuit caused by intrusion
of water drops or cutting oil,
or connector contact fault
caused by vibration.
Check the operating
environment.
Improve the operating
environmental conditions, and
replace the cable. If the alarm still
occurs, replace the SERVOPACK.
Malfunction caused by noise
interference.
--
Correct the wiring around the
encoder to avoid noise interference
(Separate the encoder cable from
the servomotor main circuit cable,
improve grounding, etc.)
A SERVOPACK fault
occurred.
--
Connect the servomotor to another
SERVOPACK, and turn ON the
control power. If no alarm occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
A.C91
Encoder
Communications
Position
Data Error
The noise interference
occurred on the I/O signal
line because the encoder
cable is bent and the sheath
is damaged.
Check the encoder
cable and connector.
Confirm that there is no problem
with the encoder cable layout.
The encoder cable is
bundled with a high-current
line or near a high-current
line.
Check the encoder
cable layout.
Confirm that there is no surge
voltage on the encoder cable.
The FG potential varies
because of influence from
machines on the servomotor
side, such as the welder.
Check the encoder
cable layout.
Properly ground the machines to
separate from the encoder FG.
A.C92
Encoder
Communications
Timer Error
Noise interference occurred
on the I/O signal line from
the encoder.
--
Take countermeasures against
noise for the encoder wiring.
Excessive vibration and
shocks were applied to the
encoder.
Check the operating
environment.
Reduce the machine vibration or
correctly install the servomotor.
An encoder fault occurred.
--
Turn the power supply OFF and then
ON again. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
A SERVOPACK fault
occurred.
--
Turn the power supply OFF and then
ON again. If the alarm still occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
A.CA0
Encoder
Parameter
Error
An encoder fault occurred.
--
Turn the power supply OFF and then
ON again. If the alarm still occurs,
the servomotor may be faulty.
Replace the servomotor.
A SERVOPACK fault
occurred.
--
Turn the power supply OFF and then
ON again. If the alarm still occurs,
the SERVOPACK may be faulty.
Replace the SERVOPACK.
The encoder wiring and
contact are incorrect.
Check the encoder
wiring.
Correct the encoder wiring.
Noise interference occurred
due to incorrect encoder
cable specifications.
--
Use tinned annealed copper
shielded twisted-pair or screened
unshielded 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.
--
The wiring distance must be 50 m
max.
The FG potential varies
because of influence from
Check the encoder
Properly ground the machines to