YASKAWA SGD7S-120A, Technical Manual

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Problem Possible Cause Confirmation Correction Reference
The encoder was sub-
jected to excessive
vibration or shock.
Turn OFF the power
supply to the servo
system. Check to see
if vibration from the
machine occurred.
Check the Servomotor
installation (mounting
surface precision,
securing state, and
alignment). Check the
linear encoder instal-
lation (mounting sur-
face precision and
securing method).
Reduce machine
vibration. Improve the
mounting state of the
Servomotor or linear
encoder.
–
The coupling between
the machine and Ser-
vomotor is not suit-
able.
Turn OFF the power
supply to the servo
system. Check to see
if position offset
occurs at the coupling
between machine and
Servomotor.
Correctly secure the
coupling between the
machine and Servo-
motor.
–
Noise interference
occurred because of
incorrect I/O signal
cable specifications.
Turn OFF the power
supply to the servo
system. Check the I/O
Signal Cables to see if
they satisfy specifica-
tions. Use a shielded
twisted-pair cables or
a screened twisted-
pair cable with con-
ductors of at least
0.12 mm
2
.
Use cables that satisfy
the specifications.
–
Noise interference
occurred because an
I/O Signal Cable is too
long.
Turn OFF the power
supply to the servo
system. Check the
lengths of the I/O
Signal Cables.
The I/O Signal Cables
must be no longer
than 3 m.
–
An encoder fault
occurred. (The pulse
count does not
change.)
– Turn OFF the power
supply to the servo
system. Replace the
Servomotor or linear
encoder.
–
A failure occurred in
the SERVOPACK.
– Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
–
Servomotor Over-
heated
The surrounding air
temperature is too
high.
Measure the sur-
rounding air tempera-
ture around the Ser-
vomotor.
Reduce the sur-
rounding air tempera-
ture to 40°C or less.
–
The surface of the
Servomotor is dirty.
Turn OFF the power
supply to the servo
system. Visually
check the surface for
dirt.
Clean dirt, dust, and
oil from the surface.
–
Sigma-7 Series SERVOPACKs
Maintenance
Troubleshooting Based on the Operation and Conditions of the Servomotor
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