Omron R88M-K - Page 542

12 Troubleshooting and Maintenance
12-32
G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
The Servomotor rotates
in the reverse direction
from the command.
The value set in the
Rotation Direction
Switching (3000 hex) is
incorrect.
Check the set value of object
3000 hex.
Change the set value of object
3000 hex.
The command given by the
host controller is incorrect.
• The size of the absolute
command is set incorrect.
• The polarity of an
incremental command is set
incorrect.
• Check the actual and target
values.
• Check the rotation direction.
The holding brake does
not work.
Power is supplied to the
holding brake.
Check to see if power is
supplied to the holding brake.
• Check the brake interlock
output (BKIR) signal and the
relay circuit.
• Check to see if the holding
brake is worn down.
Motor rotation is unstable. The Servomotor power
cable or encoder cable is
wired incorrectly.
Check the wiring of the
Servomotor power cable's
phases U, V, and W and check
the encoder cable's wiring.
Wire correctly.
Low rigidity is causing
vibration.
Measure the vibration
frequency of the load.
Enable the damping control.
Set the damping filter
frequency.
The load's moment of
inertia exceeds the Servo
Drive's allowable value.
Calculate the load inertia. • Check if manual tuning can
achieve proper adjustment.
• Increase the Servomotor
capacity.
Loose joint and/or large
clearance with the machine
Check the joint with the
machine.
Remove the joint looseness
with the machine.
The load and gain do not
match.
Check the response waveforms
for speed and torque.
Adjust the speed loop gain to
stabilize the rotation.
The Servomotor is
overheating.
The ambient temperature is
too high.
Check to see if the ambient
temperature around the
Servomotor is over 40°C.
• Lower the ambient
temperature around the
Servomotor to 40°C or less.
(Use a fan or air conditioner.)
• Lower the load ratio.
The heat radiation condition
for the Servomotor is
inappropriate.
• Check to see if the specified
radiation conditions are
observed.
• For a Servomotor with a
brake, check the load ratio.
• Improve the radiation
conditions.
• Reduce the load.
• Improve ventilation.
The Servomotor is
overloaded.
Measure the torque on the
analog monitor on the front
panel or from the CX-Drive.
• Decrease the acceleration
and deceleration rates.
• Lower the speed and check
the load.
The Servomotor vibrates
during rotation.
The machine position is
misaligned.
The coupling of the
Servomotor axis and the
machine is abnormal.
Check to see if the coupling of
the Servomotor and the
machine is misaligned.
• Tighten the coupling again.
• Replace the coupling with a
coupling that has no
looseness.
The host controller gave a
deceleration stop
command.
Check the control ladder
program in the host controller.
Review the control in the host
controller.
Symptom Probable cause Items to check Measures