8-13
8-3 Troubleshooting
8
Troubleshooting
The Servomotor
operates mo-
mentarily, but it
does not operate
after that.
The Servomotor Power
Cable is wired incorrectly.
Check the wiring of the Servomotor
Power Cable’s phases U, V, and W.
Wire correctly.
The Encoder Cable is
wired incorrectly.
Check the Encoder Cable’s wiring. Wire correctly.
The Servomotor
rotates without a
command.
The command pulse input
is incorrect.
Check the command pulse type. Set the command pulse in-
put appropriately.
Check the command pulse’s volt-
age.
Connect a resistor that
matches the voltage.
The Servo Drive is faulty. --- Replace the Servo Drive.
The Servomotor
rotates in the
opposite
direction from
the command.
The CW input and CCW
input are connected
reversely.
Check the Controller’s command
pulse type and the Servo Drive’s
command pulse type.
Connect the CW pulse sig-
nal to the CW Input and the
CCW pulse signal to the
CCW Input.
Servomotor
rotation is
unstable.
The Servomotor Power
Cable or Encoder Cable is
wired incorrectly.
Check the wiring of the Servomotor
Power Cable’s phases U, V, and W
and check the Encoder Cable’s wir-
ing.
Wire correctly.
The coupling system
between the Servomotor
shaft and the mechanical
system has eccentricity
and declination, loose
screws, or the torque is
fluctuating due to
engagement between
pulleys or gears.
Check the mechanical system’s
coupling section.
Review and adjust the ma-
chine.
Try rotating the Servomotor without
a load. (Disconnect it from the me-
chanical system.)
The load’s moment of
inertia exceeds the Servo
Drive’s allowable value.
Try rotating the Servomotor without
a load. (Disconnect it from the me-
chanical system.)
• Reduce the load.
• Replace it with the Servo-
motor and Servo Drive with
higher capacity.
The pulse signal line’s
connections failure.
Check the pulse signal wiring at the
Controller and Servo Drive.
Wire correctly.
Check the Controller’s command
pulse type and the Servo Drive’s
command pulse type.
Set the Servo Drive’s pulse
type to match the Control-
ler’s command pulse type.
The gain doesn’t match. According to load (non-load is in-
cluded), adjust an inertia ratio and
a gain to a suitable value from fac-
tory setting.
• Use autotuning.
• Perform manual tuning.
The CN1 input signal is
chattering.
Check the RUN Command Input
(RUN), Deviation Counter Reset In-
put (ECRST), Zero Speed Desig-
nation Input (VZERO), Internally
set Speed Selection 1, 2 (VSEL1,
VSEL2).
Correct the wiring so that
there is no chattering.
Symptom Probable cause Items to check Countermeasures
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