5-19
Symptom Control
mode
CountermeasuresItems to checkProbable cause
Servomotor op-
eration is unsta-
ble.
The Servomotor power lines
or encoder lines are wired
incorrectly.
Check the Servomotor pow-
er line U, V, and W phases,
and the encoder line wiring.
Correct the wiring. All modes
The bias function setting is
incorrect.
--- Adjust Pn107 (bias rotation-
al speed) and Pn108 (bias
addition width).
Position
The polarity of the speed
command (REF) input is
wrong.
Check the speed command
input wiring.
Correct the wiring. Speed
There are eccentricities or
looseness in the coupling
connecting the Servomotor
shaft and the mechanical
system, or there are load
torque fluctuations accord-
ing to how the pulley gears
are engaging.
Check the machinery.
Try operating the Servomo-
tor without a load.
Adjust the machinery. All modes
Gain is wrong. --- Use auto-tuning.
Adjust the gain manually.
Position
Speed
Servomotor is
overheating.
The ambient temperature is
too high.
Check to be sure that the
ambient temperature around
the Servomotor is no higher
than 40°C.
Lower the ambient tempera-
ture to 40°C or less. (Use a
cooler or fan.)
All modes
Ventilation is obstructed. Check to see whether any-
thing is blocking ventilation.
Ensure adequate ventila-
tion.
All modes
There is an overload. Check the torque command
value by means of monitor
mode (Un002).
Lighten the load.
Change to a larger capacity
Servomotor and Servo Driv-
er.
All modes
The correspondence be-
tween the Servo Driver and
the Servomotor is incorrect.
Check the models. Combine models that corre-
spond correctly.
All modes
There are un-
usual noises.
The machinery is vibrating. Inspect the machinery to
see whether there are any
foreign objects in the mov-
able parts, or whether there
is any damage, deforma-
tion, or looseness.
Fix any problems causing
vibration.
All modes
Pn100 (Speed loop gain) is
insufficient.
--- Use online auto-tuning.
Adjust the gain manually
(speed loop gain).
Position
Speed
Vibration is oc-
curring at the
same frequency
as the applica-
ble power sup-
ply.
Inductive noise is occurring. Check to see whether the
Servo Driver control signal
lines are too long.
Check to see whether con-
trol signal lines and power
supply lines are too close to
each other.
Shorten the control signal
lines.
Separate control signal lines
from power supply lines.
Use a low-impedance pow-
er supply for control signals.
All modes
The Servomo-
tor operates
even when
speed com-
mand is for 0 V.
The speed command volt-
age and the speed com-
mand input section are off-
set.
Check the speed command
voltage.
Adjust the speed command
offset (Fn009 or Fn00A).
Use speed control mode
with position lock function.
(Control mode selection:
Pn000.1 = A)
Speed
Troubleshooting Chapter 5
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