5.2 Troubleshooting for Malfunctions when Alarm Indicators Are Not Lit
53
Servomotor
does not stop
operation
smoothly or
at all when
servo is
turned OFF.
The servomotor is over-
loaded.
Check to see if the load is
excessive or the servomotor
speed is too high.
Reconsider the load condi-
tions and replace the SER-
VOPACK.
A stop circuit fault occurred.
−
Replace the SERVOPACK.
Abnormal
noise from
Servomotor
or machine
vibrates.
Mounting not secured.
Check to see if there are any
loose mounting screws.
Tighten the mounting screws.
Check to see if the coupling
is misaligned.
Align the coupling.
Check to see if the coupling
is unbalanced.
Balance the coupling.
Defective bearings
Check for the noise and
vibration around the bear-
ings.
If there is a fault, contact your
OYMC representative.
Vibration source on the
driven machine
Foreign matter, looseness, or
deformation on the machine
movable section.
(Contact the machine manu-
facturer.)
Noise interference due to
incorrect input signal cable
specifications.
Be sure that the twisted-pair
or shielded twisted-pair cable
with a core of at least
0.08 mm
2
is used.
Use the specified input signal
cables.
Noise interference because
the input signal cable is
longer than the applicable
range.
The wiring distance must be
3 m max.
Shorten the wiring distance
for input signal cable to 3 m
or less.
Noise interference because
the encoder cable specifica-
tions are incorrect.
Check to see if a shielded
twisted-pair cable with a core
of at least 0.12 mm
2
is being
used.
Use a cable that meets the
encoder cable specifications.
Noise interference because
the encoder cable is longer
than the applicable range.
Check the length of the
encoder cable.
The wiring distance must be
20 m or less.
Noise is entering the encoder
cable because the sheath is
damage.
Check to see if the encoder
cable is damaged.
Modify the encoder cable
layout so the cable is not
subjected to surge.
Excessive noise interference
on encoder cable.
Check to see if the encoder
cable is bundled with high-
current lines or near high-cur-
rent lines.
Install a surge protector on
the encoder cable.
FG potential varies due to
the influence of machines
such as a welder at the ser-
vomotor.
Check to see if the machine
is correctly grounded prop-
erly.
Ground the machine
separately from the PG’s FG.
Excessive vibration and
shock on the encoder.
Vibration from the machine
occurred or servomotor
installation is incorrect.
(Mounting surface accuracy,
securing, alignment, etc.)
Reduce vibration from the
machine or secure the servo-
motor.
The filter setting is improper.
Check the set value on the
reference filter (FIL) rotary
switch.
Increase the set value on the
reference filter (FIL) rotary
switch.
Problem
Cause
Inspection Items
Corrective Action
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