Omron OMNUC G5 R88M-K series User Manual page 425

Symptom
The Servomotor or the
load generates abnormal
noise or vibration.
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
Probable cause
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 (Pn103) is
wrong.
The Torque Command Filter
Time Constant 1 (Pn104)
does not match the load.
The Position Loop Gain 1
(Pn100) is too large.
The Speed Loop Gain 1
(Pn101) and the Speed Loop
Integration Time Constant 1
(Pn102) are balanced
incorrectly.
Noise is applied to the
control I/O signal cable
because the cable does not
meet specifications.
11-4 Troubleshooting
Items to check
Check whether the
Servomotor's mounting
screws are loose.
Check the load for
eccentricity.
Check that the coupling with
the load is not unbalanced.
Check that the decelerator
does not generate any
abnormal noise.
Check that the vibration
frequency is not 100 Hz or
lower.
Check if the resonance
frequency is high or low.
Check for noise or vibration
around the bearings.

Check the value set on the
Pn103.
Normally set 0 to Pn103.
Review the setting on the
Pn104.
Review the setting on the
Pn100.
Review the settings on the
Pn101 and Pn102.
Check that it is a twisted-pair
wire or twisted-pair shielded
cable with core wires that are
2
at least 0.08 mm .
Measures
Retighten the mounting
screws.
Eliminate the
eccentricity, which
results in torque
fluctuation and noise.
Balance the rotation.
Check the decelerator
specification. Investigate
the decelerator for
breakage.
If the frequency is 100 Hz
or lower, set the correct
damping frequency on
the damping filter to
eliminate the vibration.
If the frequency is high,
set the adaptive filter in a
manner that stops the
resonance. Alternatively,
measure the resonance
frequency and set the
Notch Filter 1 and 2.
Contact your OMRON
dealer or sales office.
Check if the manual
tuning can make a proper
adjustment.
Return the setting to the
initial 0.
Alternatively, set a large
value and operate the
motor.
Set a larger value on the
Pn104 and eliminate the
vibration.
By the CX-Drive or the
analog monitor, measure
the response and adjust
the gain.
Use control I/O signal
cable that meets
specifications.
11-32
11