8-20
8-3 Troubleshooting
Troubleshooting
8
Unusual noise
and vibration
occurs from
the Servomotor
or the load.
The Torque Command
Filter Time Constant
(Pn014) does not match
the load.
Review the Torque Command Filter
Time Constant (Pn014).
Increase the Torque Com-
mand Filter Time Constant
(Pn014) to stop the vibration.
Vibration occurs due to
machine resonance.
Check if the resonance frequency is
high or low.
If the resonance frequency is
high, set an adaptive filter to
stop the resonance, or mea-
sure the resonance frequen-
cy and set Notch
Filters 1 and 2.
The Position Loop Gain
(Pn010) is too large.
Poor balance between
the Speed Loop
Integration Time Constant
(Pn012) and the Speed
Loop Gain (Pn011).
Review the Position Loop Gain
(Pn010), Speed Loop Integration
Time Constant (Pn012), and the
Speed Loop Gain (Pn011).
Use CX-Drive and
analog monitors (SP, IM) to
measure the response and
adjust the gain.
The Speed Feedback Filter
Time Constant (Pn013)
does not match the load.
Check the Speed Feedback Filter
Time Constant (Pn013). The
parameter is usually set to 0.
Increase the Speed Feed-
back Filter Time Constant
(Pn013) and operate.
Vibration occurs due to low
mechanical rigidity.
Check whether the vibration fre-
quency is 100 Hz or below.
If the vibration frequency is
100 Hz or below, stop the
vibration by setting the vibra-
tion frequency for the vibra-
tion filter.
Vibration occurs due to
mechanical installation.
Check whether the coupling with
the load is unbalanced.
Make adjustments to
balance the rotation.
Check for eccentricity of the load.
Eliminate eccentricity.
Eccentricity of the load
results in noise due to
fluctuation of torque.
Check for noise from within the
decelerator.
Check the decelerator speci-
fications and perform an
inspection.
Symptom Probable cause Items to check Countermeasure
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