YASKAWA SGM7D-30F Product Manual page 208

Problem Possible Cause
The Servomotor vibrated
considerably while perform-
ing the tuning-less function
with the default settings.
The machine mounting is not
secure.
The machine mounting is not
secure.
The bearings are defective.
Abnormal
Noise from
There is a vibration source at
Servomotor the driven machine.
Noise interference occurred
because of incorrect I/O sig-
nal cable specifications.
Noise interference occurred
because an I/O signal cable
is too long.
Noise interference occurred
because of incorrect Encoder
Cable specifications.
3.3 FT82 SERVOPACK with MECHATROLINK-III Communications References
3.3.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
Check the waveform of
the motor speed.
Check to see if there are
any loose mounting
screws.
Check to see if there is
misalignment in the cou-
pling.
Check to see if the cou-
pling is balanced.
Check for noise and
vibration around the bear-
ings.
Check for any foreign
matter, damage, or defor-
mation in the machine's
moving parts.
Check the I/O signal
cables to see if they sat-
isfy specifications. Use
shielded twisted-pair wire
cables or screened
twisted-pair cables with
conductors of at least
2
0.12 mm .
Check the lengths of the
I/O signal cables.
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 conductors
of at least 0.12 mm
Continued from previous page.
Correction
Reduce the load so
that the moment of
inertia ratio or mass
ratio is within the allow-
able value, or increase
the load level or reduce
the rigidity level in the
tuning-less level set-
tings.
Tighten the mounting
screws.
Align the coupling.
Balance the coupling.
Replace the Servomo-
tor.
Consult with the
machine manufacturer.
Use cables that satisfy
the specifications.
The I/O signal cables
must be no longer than
3 m.
Use cables that satisfy
the specifications.
2
.
Continued on next page.
Reference
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