5-16
5-3-2 Troubleshooting by Means of Operating Status
Symptom
Probable cause
Items to check
Countermeasures
Control
mode
The power sup-
ply indicator
(POWER) does
not light even
when the power
supply is turned
ON.
Power supply lines are in-
correctly wired.
Check the power supply
voltage.
Check the power supply
lines.
Correct the power supply.
Correct the wiring.
All modes
The Servomo-
tor does not op-
erate even
h
The RUN signal is OFF.
Check the RUN signal’s ON
and OFF by means of the
monitor mode (Un005).
Input the RUN signal.
Correct the wiring.
All modes
when a com-
mand is given.
(No alarm is
output.)
The POT and NOT signals
are OFF (except when
Pn50A.3 and Pn50b.0 are
set to 8).
Check whether POT and
NOT are displayed in status
display mode.
Turn ON the POT and NOT
signals.
If POT and NOT are not be-
ing used, set to “Always
OFF” (Pn50A.3 and
Pn50b.0 = 8).
All modes
The control mode is not
right.
Check Pn000.1 (control
mode selection)
Set the control mode to
match the command type.
All modes
The deviation counter reset
input (ECRST) is ON.
With monitor mode, check
the ON/OFF status of the
ECRST signal (Un005).
Turn OFF the ECRST sig-
nal.
Correct the wiring.
Position
Pn200.1 (Deviation counter
reset) setting is incorrect.
Reset Pn200.1 to match the
Controller.
Position
An error occurred with the
RESET (alarm reset) signal
ON.
Check the RESET signal’s
ON and OFF by means of
the monitor mode.
Turn the RESET signal OFF
and take measures
according to the alarm
display.
All modes
Pn200.0 (Command pulse
mode) setting is incorrect.
Check the Controller’s com-
mand pulse type and the
Servo Driver’s command
pulse mode.
Set the mode to match the
Controller’s command pulse
type.
Position
The speed command (REF)
voltage is 0 V.
Check the speed command
by means of the monitor
mode (Un001).
Check the speed command
voltage.
Correct the wiring.
Speed
The PLOCK signal is ON.
Check the PLOCK signal by
means of the monitor mode
(internal status bit).
Turn the PLOCK signal
OFF.
Check the Pn501 (Position
lock rotation speed) value.
Speed
SEN (sensor ON) is turned
OFF (when using an abso-
lute encoder).
Check whether the SEN sig-
nal is ON or OFF using
monitor mode.
Turn ON the SEN signal.
All modes
The Servomo-
tor operates
momentarily,
but then it does
not operate.
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
Troubleshooting
Chapter 5
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