User`s manual

9 Troubleshooting
9-22
Overtravel (OT)
Forward or reverse run prohibited
signal is input.
Check the external power supply
(+24 V) voltage for the input signal.
Correct the external power supply
(+24 V) voltage.
Check if the overtravel limit switch
operates properly.
Correct the overtravel limit switch.
Check if the overtravel limit switch
is wired correctly.
Correct the overtravel limit switch
wiring.
Check the settings for PnB0F and
PnB10.
Set the parameters correctly.
Forward or reverse run prohibited
signal is malfunctioning.
Check the fluctuation of external
power supply (+24 V) voltage for
the input signal.
Stabilize the external power supply
(+24 V) voltage.
Check if the overtravel limit switch
operates correctly.
Stabilize the operation of the over-
travel limit switch.
Check if the overtravel limit switch
wiring is correct. (Check for dam-
aged cables or loose screws.)
Correct the overtravel limit switch
wiring.
Incorrect servomotor stop method
selection
Check Pn001.0 and PnB1F when
the servomotor power is OFF.
Select a servomotor stop method
other than “coast to stop.”
Check Pn001.0 and PnB1F in
torque control.
Select a servomotor stop method
other than “coast to stop.”
Improper Position
to Stop by
Overtravel (OT)
Signal
Improper limit switch position and
dog length
−
Install the limit switch at the appro-
priate position.
The overtravel limit switch position
is too close for the coasting dis-
tance.
−
Install the overtravel limit switch at
the appropriate position.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions