Omron G5 Series User Manual page 462

10 Troubleshooting and Maintenance
Symptom Probable cause
The Servomotor The Servomotor power
operates cable is wired incorrectly.
momentarily, but
The encoder cable is wired
then it does not
incorrectly.
operate after that.
The Servomotor The command pulse input
rotates without a is incorrect.
command.
The Servo Drive is faulty.
The Servomotor The CW input and the CCW
rotates opposite to input are connected in
the command reverse.
direction.
Motor rotation is The Servomotor power
unstable. cable or encoder cable is
wired incorrectly.
The load torque fluctuates
due to eccentricity of the
coupling that connects the
motor shaft to mechanical
systems, loose screws, or
poor engagement between
the pulley and the gear.
The load's moment of
inertia exceeds the Servo
Drive's allowable value.
Pulse signal lines are
connected poorly.
The gain setting is
inappropriate.
Chattering occurs in an
input signal to CN1.
The Servomotor is The ambient temperature is
overheating. too high.
Ventilation is blocked.
The Servomotor is
overloaded.
The Servomotor vibrates
during operation.
The Servomotor's Power is supplied to the
holding brake does holding brake.
not work.
10 - 18
Check items
Check the wiring of the Servomotor
power cable phases U, V, and W.
Check the encoder cable wiring.
Check the command pulse type.
Check the command pulse voltage.
Check the command pulse type of the
controller and that of the Servo Drive.
Check the wiring of the Servomotor
power cable phases U, V, and W and
that of the encoder cable.
Check the connection to mechanical
systems.
Try to operate the Servomotor with no
load (by disconnecting the motor from
mechanical systems).
Try to operate the Servomotor with no
load (by disconnecting the motor from
mechanical systems).
Check the pulse signal wiring for the
controller and the Servo Drive.
Check the command pulse type of the
controller and that of the Servo Drive.
Check the Operation Command
(RUN), Error Counter Reset Input
(ECRST), Zero Speed Designation
Input (VZERO), and Internally Set
Speed 1/2 (VSEL1/VSEL2) signals.
Check to see if the ambient
temperature around the Servomotor is
over 40°C.
Check to see if ventilation is blocked.
Try to operate the Servomotor with no
load (by disconnecting the motor from
mechanical systems).
Check to see if power is supplied to
the holding brake.
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User's Manual
Wire correctly.
Wire correctly.
Make sure that the command
pulse input is appropriate.
Connect a resistor that
matches the voltage.
– Replace the Servo Drive.
Connect the CW pulse signal to
the CW input and the CCW
pulse signal to the CCW input,
respectively.
Wire correctly.
Recheck and adjust the
machine.
• Reduce the load.
• Replace the Servomotor and
the Servo Drive with larger
capacity ones.
Wire correctly.
Set the command pulse type of
the Servo Drive so that it
matches the command pulse
type of the controller.
– Perform manual tuning.
Wire correctly to prevent
chattering.
Lower the ambient temperature
around the Servomotor to 40°C
or less. (Use a fan or air
conditioner.)
Take measures to improve
ventilation.
• Reduce the load.
• Replace the Servomotor and
the Servo Drive with larger
capacity ones.
Design the circuit so that
stopping the Servomotor
causes the power supply to the
holding brake to turn OFF when
it holds a load.
Measures