Chapter 5
5-13
Troubleshooting
The Servomotor
does not oper-
ate even when a
command is
given.
The RUN signal is OFF. Check the RUN signal’s ON and
OFF operation.
Input the RUN signal.
Correct the wiring.
The deviation counter
reset input (ECRST) is
ON.
Check the ON/OFF status of the
ECRST signal.
Turn OFF the ECRST sig-
nal.
Correct the wiring.
Pn200.1 (deviation counter reset)
setting is incorrect.
Reset Pn200.1 to match the
Controller.
An error occurred with
the RESET (alarm reset)
signal ON.
Check the ON/OFF status of the
RESET signal.
Turn the RESET signal OFF
and take measures accord-
ing to the alarm display.
Function switch settings
are incorrect.
Check function switch 6 (switch/
parameter setting).
If using function switch 3
(command pulse input set-
ting), turn OFF switch 6.
If using parameter Pn200.0,
turn ON switch 6.
Function switch 3 (com-
mand pulse input) setting
is incorrect. (When func-
tion switches are being
used.)
Check the Controller’s command
pulse type and the Servo Driver’s
command pulse mode.
Set the mode to match the
Controller’s command pulse
type.
Pn200.0 (command
pulse mode) setting is
incorrect. (When param-
eter setting is being
used.)
Check the Controller’s command
pulse type and the Servo Driver’s
command pulse mode.
Set the mode to match the
Controller’s command pulse
type.
Servomotor power lines
are incorrectly wired.
Check Servomotor power lines. Rewire correctly.
Command pulse is incor-
rectly wired.
Check the command pulse wiring. Rewire correctly.
Check the command pulse volt-
age.
Connect a resistor match-
ing the voltage.
The Servomotor
operates
momentarily, but
then it does not
operate.
The Servomotor power
lines or encoder lines are
wired incorrectly.
Check the Servomotor power line
U, V, and W phases, and the
encoder line wiring.
Correct the wiring.
The command pulse is
more than 250 kpps.
Check the Controller’s command
pulse frequency.
Reset the command pulse
to 250 kpps max.
Servomotor
operation is
unstable.
The Servomotor power
lines or encoder lines are
wired incorrectly.
Check the Servomotor power line
U, V, and W phases, and the
encoder line wiring.
Correct the wiring.
There are eccentricities
or looseness in the cou-
pling connecting the Ser-
vomotor shaft and the
mechanical system, or
there are load torque
fluctuations according to
how the pulley gears are
engaging.
Check the machinery.
Try operating the Servomotor with-
out a load.
Adjust the machinery.
Gain is wrong. --- Use autotuning.
Adjust the gain manually.
Symptom Probable cause Items to check Countermeasures
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