Omron R88D-KN series User Manual page 394

12 Troubleshooting and Maintenance
Symptom
The motor operates in the
reverse direction from the
command.
The holding brake does
not work.
Motor operation is
unstable.
The motor is overheating. The ambient temperature is
The machine position is
misaligned.
The motor does not stop
or is hard to stop even if
the servo is turned OFF
while the motor is
operating.
12-24
Probable cause
The value set in the
Movement Direction Setting
(3000 hex) is incorrect.
The command given by the
host controller is incorrect.
Power is supplied to the
holding brake.
The motor power cable or
external encoder cable is
wired incorrectly.
Low rigidity is causing
vibration.
The load mass exceeds the
Servo Drive's allowable
value.
Loose joint and/or large
clearance with the machine
The load and gain do not
match.
too high.
The heat radiation condition
for the motor is
inappropriate.
The motor is overloaded.
The motor vibrates during
operation.
There is an error in the
coupling of the Liner Motor
and the mechanical system.
The host controller gave a
deceleration stop
command.
The load mass is too large.
The dynamic brake is
disabled.
G5 Series AC Servo Drives With Built-in EtherCAT Communications, Linear Motor Type
Items to check
Check the set value of object
3000 hex.
• The size of the absolute
command is set incorrect.
• The polarity of an
incremental command is set
incorrect.
Check to see if power is
supplied to the holding brake.
Check the wiring of the motor
power cable's phases U, V, and
W and check the external
encoder cable's wiring.
Measure the vibration
frequency of the load.
Calculate the load mass.
Check the joint with the
machine.
Check the response waveforms
for speed and force.
Check to see if the ambient
temperature around the motor
is over 40C.
• Check to see if the specified
radiation conditions are
observed.
• For a motor with a brake,
check the load ratio.
Measure the force on the
analog monitor on the front
panel or from the CX-Drive.
Check to see if the coupling of
the Linear Motor and the
machine is misaligned.
Check the control ladder
program in the host controller.
• Check the load mass.
• Check the motor speed.
• The dynamic brake
resistance is disconnected.
Check if the dynamic brake is
disabled or broken.
Measures
Change the set value of object
3000 hex.
• Check the actual and target
values.
• Check the operation
direction.
• Check the brake interlock
output (BKIR) signal and the
relay circuit.
• Check to see if the holding
brake is worn down.
Wire correctly.
Enable the damping control.
Set the damping filter
frequency.
• Check if manual tuning can
achieve proper adjustment.
• Increase the motor capacity.
Remove the joint looseness
with the machine.
Adjust the speed loop gain to
stabilize the operation.
• Lower the ambient
temperature around the
motor to 40C or less. (Use a
fan or air conditioner.)
• Lower the load ratio.
• Improve the radiation
conditions.
• Reduce the load.
• Improve ventilation.
• Decrease the acceleration
and deceleration rates.
• Lower the speed and check
the load.
• Tighten the coupling again.
Review the control in the host
controller.
• Review the load mass.
• Replace the motor and Servo
Drive with proper ones.
• Enable the dynamic brake, if
it is disabled.
• Replace the brake if it is
broken or if the resistor is
disconnected.