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11-17
11-4 Troubleshooting
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
11
Error and Maintenance
The motor does
not rotate even if
commands are
input from the
controller.
(Continued from
previous page)
The torque command is
disabled.
Check if the torque command input
method is correct.
Set the torque command
correctly.
The CW input and CCW
input are ON at the same
time.
Check the command pulse's wiring.
• Input the pulse signal either to
the CW input or CCW input.
• Always turn OFF the
terminal that is not input to.
Servo Drive is faulty.
−
Replace the Servo Drive.
The motor operates
momentarily, but
then it does not
operate after that.
The motor power cable is
wired incorrectly.
Check the wiring of the motor power
cable's phases U, V, and W.
Wire correctly.
The encoder cable is wired incorrectly. Check the encoder cable's wiring.
Wire correctly.
The motor rotates
without a
command.
The command pulse input is
incorrect.
Check the command pulse type.
Set the correct command pulse input.
Check the command pulse's voltage. Connect a resistor that
matches the voltage.
Servo Drive is faulty.
−
Replace the Servo Drive.
The motor rotates in
the reverse direction
from the command.
The CW input and CCW
input connections are
reversed.
Check the controller's command
pulse type and the Servo Drive's
command pulse type.
Connect the CW pulse signal
to the CW input and the CCW
pulse signal to the CCW input.
Motor rotation is
unstable.
The motor power cable or
encoder cable is wired
incorrectly.
Check the wiring of the motor power
cable's phases U, V, and W and
check the encoder cable's wiring.
Wire correctly.
The coupling system between the
motor shaft and the mechanical
system has eccentricity or loose
screws, or the load torque is
fluctuating due to engagement
between pulleys or gears.
Check the mechanical system's
coupling section.
Review and adjust the
machine.
Try rotating the motor without a load.
(Disconnect it from the mechanical
system.)
The load's moment of inertia
exceeds the Servo Drive's
allowable value.
Try rotating the motor without a load.
(Disconnect it from the mechanical
system.)
• Reduce the load.
• Replace the Servomotor
and Servo Drive with
higher capacity models.
The pulse signal line's
connections are loose.
Check the pulse signal line's wiring
at the controller and Servo Drive.
Wire correctly.
Check the controller's command
pulse type and the Servo Drive's
command pulse type.
Set the Servo Drive's pulse
type to match the controller's
command pulse type.
The gain is wrong.
−
Perform manual tuning.
The CN1 input signal is
chattering.
Check the operation command (RUN),
error counter reset (ECRST), zero speed
designation (VZERO), internally set
speed selection 1 (VSEL1) and internally
set speed selection 2 (VSEL2).
Wire correctly so that there is
no chattering.
The motor is
overheating.
The ambient temperature is
too high.
Check that the ambient temperature
around the motor is 40
°
C or less.
Lower the ambient temperature
around the motor to 40
°
C or
less. (Use a fan or air
conditioner.)
Ventilation is obstructed.
Check to see whether anything is
blocking ventilation.
Improve ventilation.
The motor is overloaded.
Try rotating the motor without a load.
(Disconnect it from the mechanical
system.)
• Reduce the load.
• Replace the Servomotor
and Servo Drive with
higher capacity models.
The motor is vibrating.
Symptom
Probable cause
Items to check
Measures