YASKAWA Sigma-7 SGD7S Series - Page 651

Problem Possible Cause Confirmation Correction Reference
There is a vibration
source at the driven
machine.
Turn OFF the power
supply to the servo
system. Check for any
foreign matter,
damage, or deforma-
tion in the machine’s
moving parts.
Consult with the
machine manufac-
turer.
–
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 shielded
twisted-pair wire
cables or screened
twisted-pair cables
with conductors 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.
–
Noise interference
occurred because of
incorrect Encoder
Cable specifications.
Turn OFF the power
supply to the servo
system. Make sure
that the rotary or
Linear Encoder Cable
satisfies the specifica-
tions. Use a shielded
twisted-pair wire cable
or a screened twisted-
pair cable with a con-
ductors of at least
0.12 mm
2
.
Use cables that satisfy
the specifications.
–
Noise interference
occurred because the
Encoder Cable is too
long.
Turn OFF the power
supply to the servo
system. Check the
length of the Encoder
Cable.
n Rotary Servomo-
tors: The Encoder
Cable length must
be 50 m max.
n Linear Servomo-
tors: Make sure
that the Serial
Converter Unit
cable is no longer
than 20 m and
that the Linear
Encoder Cable
and the Sensor
Cable are no
longer than 15 m
each.
–
Noise interference
occurred because the
Encoder Cable is
damaged.
Turn OFF the power
supply to the servo
system. Check the
Encoder Cable to see
if it is pinched or the
sheath is damaged.
Replace the Encoder
Cable and correct the
cable installation envi-
ronment.
–
Sigma-7 Series SERVOPACKs
Maintenance
Troubleshooting Based on the Operation and Conditions of the Servomotor
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