12-28
12-4 Troubleshooting
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
12
Troubleshooting and Maintenance
The Servomotor does not
stop or is hard to stop
even if the servo is turned
OFF while the
Servomotor is rotating.
The load inertia is too large. • Check the load inertia.
• Check the Servomotor
rotation speed.
• The dynamic brake
resistance is disconnected.
• Review the load inertia.
• Replace the
Servomotor 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.
The Servomotor or the
load generates abnormal
noise or vibration.
Vibration occurs due to
improper mechanical
installation.
Check to see if the
Servomotor's mounting
screws are loose.
Retighten the mounting
screws.
Check the load for
eccentricity.
Eliminate the
eccentricity. It results in
torque fluctuation and
noise.
Check to see if the coupling
with the load is unbalanced.
Balance the rotation.
Check to see if the decelerator
is generating any abnormal
noise.
Check the decelerator
specifications. Check the
decelerator for
malfunctions.
Vibration occurs due to low
mechanical rigidity.
Check to see if the vibration
frequency is 100 Hz or lower.
If the frequency is 100 Hz
or lower, set the correct
damping frequency for
the damping filter to
eliminate the vibration.
Vibration occurs due to
machine resonance.
Check to see if the resonance
frequency is high or low.
If the resonance
frequency is high, set the
adaptive filter to eliminate
the resonance.
Alternatively, measure
the resonance frequency
and set Notch Filter 1 and
2.
There is a problem with the
bearings.
Check for noise or vibration
around the bearings.
Check to see if the
bearings are mounted
properly, and adjust them
if necessary.
The gain is wrong. − Check if manual tuning
can achieve proper
adjustment.
The Speed Feedback Filter
Time Constant 1 (3103 hex)
is wrong.
Check the set value of object
3103 hex. Normally set 0.
Return the setting to the
default value of 0.
Alternatively, set a large
value and operate the
Servomotor.
The Torque Command Filter
Time Constant 1 (3104 hex)
does not match the load.
Review the set value of object
3104 hex.
Set a larger value for
object 3104 hex to
eliminate the vibration.
Symptom Probable cause Items to check Measures
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