YASKAWA E-7S SERVOPACK SGD7S Product Manual page 583

15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Abnormal
Noise from
Servomotor
15-72
Possible Cause
The machine mounting is not
secure.
The bearings are defective.
There is a vibration source at
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.
Confirmation
Turn OFF the power sup-
ply to the servo system.
Check to see if there are
any loose mounting
screws.
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
misalignment in the cou-
pling.
Turn OFF the power sup-
ply to the servo system.
Check to see if the cou-
pling is balanced.
Turn OFF the power sup-
ply to the servo system.
Check for noise and
vibration around the bear-
ings.
Turn OFF the power sup-
ply to the servo system.
Check for any foreign
matter, damage, or defor-
mation in the machine's
moving parts.
Turn OFF the power sup-
ply to the servo system.
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 .
Turn OFF the power sup-
ply to the servo system.
Check the lengths of the
I/O signal cables.
Turn OFF the power sup-
ply to the servo system.
Check the Encoder Cable
to see if it satisfies speci-
fications. Use shielded
twisted-pair cables or
screened twisted-pair
cables with conductors of
2
at least 0.12 mm
(stranded wire).
Continued from previous page.
Correction Reference
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.
Continued on next page.