Omron OMNUC G5 Series User Manual page 403

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