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8.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
8-56
Abnormal
Noise from
Servomotor
There is variation in the FG
potential because of the
influence of machines on the
Servomotor side, such as a
welder.
Turn OFF the power sup-
ply to the servo system.
Check to see if the
machines are correctly
grounded.
Properly ground the
machines to separate
them from the FG of
the encoder.
–
There is a SERVOPACK
pulse counting error due to
noise.
Check to see if there is
noise interference on the
signal line from the
encoder.
Turn OFF the power
supply to the servo
system. Implement
countermeasures
against noise for the
encoder wiring.
–
The encoder was subjected
to excessive vibration or
shock.
Turn OFF the power sup-
ply to the servo system.
Check to see if vibration
from the machine
occurred. Check the Ser-
vomotor installation
(mounting surface preci-
sion, securing state, and
alignment).
Check the linear encoder
installation (mounting sur-
face precision and secur-
ing method).
Reduce machine vibra-
tion. Improve the
mounting state of the
Servomotor or linear
encoder.
–
A failure occurred in the
encoder.
–
Turn OFF the power
supply to the servo
system. Replace the
Servomotor.
–
A failure occurred in the
Serial Converter Unit.
–
Turn OFF the power
supply to the servo
system. Replace the
Serial Converter Unit.
–
A failure occurred in the linear
encoder.
–
Turn OFF the power
supply to the servo
system. Replace the
linear encoder.
–
Servomotor
Vibrates at
Frequency
of Approx.
200 to 400
Hz.
The servo gains are not bal-
anced.
Check to see if the servo
gains have been cor-
rectly tuned.
Perform autotuning
without a host refer-
ence.
–
The setting of Pn100 (Speed
Loop Gain) is too high.
Check the setting of
Pn100.
The default setting is Kv =
40.0 Hz.
Set Pn100 to an appro-
priate value.
–
The setting of Pn102 (Posi-
tion Loop Gain) is too high.
Check the setting of
Pn102.
The default setting is Kp
= 40.0/s.
Set Pn102 to an appro-
priate value.
–
The setting of Pn101 (Speed
Loop Integral Time Con-
stant) is not appropriate.
Check the setting of
Pn101.
The default setting is Ti =
20.0 ms.
Set Pn101 to an appro-
priate value.
–
The setting of Pn103
(Moment of Inertia Ratio or
Mass Ratio) is not appropri-
ate.
Check the setting of
Pn103.
Set Pn103 to an appro-
priate value.
–
Continued on next page.
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference