8-15
8-3 Troubleshooting
8
Troubleshooting
The Servomotor
is producing
unusual noises
or the machine is
vibrating.
(Continued from
previous page.)
The FG’s potential is fluc-
tuating due to devices near
the Servomotor, such as a
welding machine.
Check for grounding problems (fail-
ure to ground or incomplete
grounding) at devices such as a
welding machine near the Servo-
motor.
Ground the equipment prop-
erly and prevent currents
from flowing to the encoder
FG.
Errors are being caused by
excessive vibration or
shock on the encoder.
There are problems with mechani-
cal vibration or motor installation
(such as the mounting surface pre-
cision, attachment, or axial mis-
alignment).
Reduce the mechanical vi-
bration or correct the Servo-
motor’s installation.
The machine and the Ser-
vomotor are resonating.
Check whether the machine is res-
onating.
• Readjust the Torque Com-
mand Filter Time Constant.
• If there is resonance, set
the Notch Filter 1 Frequen-
cy (Pn1D) and Notch Filter
1 Width (Pn1E).
Vibration is
occurring at the
same frequency
as the power
supply.
Inductive noise is occur-
ring.
Check whether the Servo Drive
control signal lines are too long.
Shorten the control signal
lines.
Check whether control signal lines
and power supply lines are bundled
together.
• Separate control signal
lines from power supply
lines.
• Use a low-impedance
power supply for control
signals.
The position is
misaligned.
(Position mis-
alignment occurs
without an alarm
being output.)
There is an error in the
coupling of the mechanical
system and the Servomo-
tor.
Check whether the coupling of the
mechanical system and the Servo-
motor is misaligned.
Couple the mechanical sys-
tem and the Servomotor cor-
rectly.
Noise is entering the Devi-
ation Counter Reset Input
(ECRST).
Check whether the control signal
lines and power supply lines are
bundled together.
Take measures against
noise, such as separating
the control signal lines and
power lines.
The gain is does not
match.
--- • Use autotuning.
• Perform manual tuning.
The load inertia is too
large.
Check the following:
• Check whether the load is too
large.
• Check whether the rotation speed
of the Servomotor is too high.
• Adjust the gain.
• Review the load condi-
tions, and replace the Ser-
vomotor and Servo Drive
with appropriate models.
Symptom Probable cause Items to check Countermeasures
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