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12 Troubleshooting and Maintenance
12-24
G5 Series AC Servo Drives With Built-in EtherCAT Communications, Linear Motor Type
The motor operates in the
reverse direction from the
command.
The value set in the
Movement Direction Setting
(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 operation
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 operation is
unstable.
The motor power cable or
external encoder cable is
wired incorrectly.
Check the wiring of the motor
power cable's phases U, V, and
W and check the external
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 mass exceeds the
Servo Drive's allowable
value.
Calculate the load mass.
•
Check if manual tuning can
achieve proper adjustment.
•
Increase the motor 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 force.
Adjust the speed loop gain to
stabilize the operation.
The motor is overheating.
The ambient temperature is
too high.
Check to see if the ambient
temperature around the motor
is over 40
C.
•
Lower the ambient
temperature around the
motor to 40
C or less. (Use a
fan or air conditioner.)
•
Lower the load ratio.
The heat radiation condition
for the motor is
inappropriate.
•
Check to see if the specified
radiation conditions are
observed.
•
For a motor with a brake,
check the load ratio.
•
Improve the radiation
conditions.
•
Reduce the load.
•
Improve ventilation.
The motor is overloaded.
Measure the force 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 motor vibrates during
operation.
The machine position is
misaligned.
There is an error in the
coupling of the Liner Motor
and the mechanical system.
Check to see if the coupling of
the Linear Motor and the
machine is misaligned.
•
Tighten the coupling again.
The host controller gave a
deceleration stop
command.
Check the control ladder
program in the host controller.
Review the control in the host
controller.
The motor does not stop
or is hard to stop even if
the servo is turned OFF
while the motor is
operating.
The load mass is too large.
•
Check the load mass.
•
Check the motor speed.
•
The dynamic brake
resistance is disconnected.
•
Review the load mass.
•
Replace the motor and Servo
Drive with proper ones.
The dynamic brake is
disabled.
Check if the dynamic brake is
disabled or broken.
•
Enable the dynamic brake, if
it is disabled.
•
Replace the brake if it is
broken or if the resistor is
disconnected.
Symptom
Probable cause
Items to check
Measures