Chapter 8. Troubleshooting
8-1
8. Troubleshooting
In case an error occurs during operation, take the following steps. If taking such steps does not
correct errors, contact our service center.
8.1 Servo Motor
Actions to be taken in case of errors
Symptom Cause Inspection Corrective action
Parameter setting is
incorrect
Check parameters related to
motor, encoder, encoder type
and control mode.
Reset parameters.
(See sections 5 and 6)
Overloaded
Check machine running
condition.
Readjust mechanical
systems.
Motor defective
Check motor lead terminal with a
tester.
If voltage is correct, replace
motor.
Screws loosened Check the screws. Retighten loose screws.
Incorrect external
wiring, or cable
disconnected
Check the motor and encoder
wiring.
Rewire.
Replace cable.
Motor
does
not start
Encoder defective Check the output wave form.
Replace encoder.
(Use A/S service)
Defective connection
Check connection of the motor
lead terminal.
Repair defective part.
Input voltage low Check drive input voltage. Change power supply.
Motor
running
unstable
Overloaded Check machine condition.
Remove foreign material from
the rotator and lubricate (or
grease) it.
Ambient temperature
high
Check the motor ambient
temperature. (Should be lower
than 40℃)
Change heat-shield structure.
Motor surface stained
Check motor surface for attached
foreign materials.
Clean the surface of the
motor.
Overloaded
Check the load rate of the drive.
Check acceleration/deceleration
cycle.
Reduce load.
Increase
acceleration/deceleration time
Motor
over-
heated
Magnetic power
deteriorated
Check counter electromotive
voltage and wave form.
Replace motor.
Defective coupling
Check the tightness of the
coupling screws and the
concentricity of joints.
Readjust coupling.
Defective bearing
Check the bearing for vibration or
abnormal noise.
Contact LG service center.
bnormal
noise
Parameter misset
(inertia ratio, gain,
time constant)
Check control parameters.
See Chapter 6. Parameter
Setting.
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