6. Troubleshooting and check
6-1
6.1 Troubleshooting
6.1.1 Servo motor
Symptom Cause Inspection Corrective Actions
Parameter
mis-setting
Check the parameter of
motor, encoder, encoder
type, control mode etc.
Reset parameter.
(Refer to Chapter 3)
Overload
Check the revolution
condition of the machine.
Readjust the machine device.
Motor defect
Measure the motor lead
terminal with a tester.
For normal voltage, replace the
motor.
Loose screw
Check the connection part
with drive.
Tighten loose parts.
External mis-wiring
Cable disconnection
Check motor and encoder
wiring.
Rework on the wiring.
Replace the cable.
Motor
does not
start.
Encoder defect
Check the output wave
shape.
Replace the encoder.
(Request for repair)
Wiring connection
defectiveness
Check the connection of
the motor lead terminal.
Correct the wiring.
Low input voltage
Check the drive input
voltage.
Correct the power.
Motor
revolution
is unstable
Overload
Check the machine
condition.
Remove any particle on the
revolution part and supply
lubricant (or grease)
High ambient
temperature
Check the surrounding
temperature of the motor
installation part.
(40℃ or below)
Reduce ambient temperature to
40 ℃ max.
Contamination on
motor surface
Check whether there are
any alien particles on the
motor surface.
Clean dust and oil dirt.
Overload
Check the load rate of the
drive. Check the
acceleration/deceleration
frequency.
Reduce load. Increase
acceleration/deceleration time.
Motor is
over-
heated.
Low magnetic power
of magnet
Check the comparator
voltage and voltage wave
shape.
Replace the motor.
Coupling defect
Check the screw condition
of the coupling and copper
core of the connection
part etc.
Readjust the coupling.
Bearing problem
Check the bearing
vibration and abnormal
noise.
Contact our company.
Abnormal
noise is
generated.
Parameter mis-
setting(Motor/encoder
ID, inertia ratio, gain,
TC)
Check the control
parameter.
Refer to parameter setting
method in chapter 3.
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