14.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
14-63
Overtravel
Occurred
The CCW-OT/CW-OT (CCW
Drive Prohibit or CW Drive
Prohibit) signal was input.
Check the external power
supply (+24 V) voltage for
the input signals.
Correct the external
power supply (+24 V)
voltage for the input
signals.
−
Check the operating con-
dition of the overtravel
limit switches.
Make sure that the
overtravel limit switches
operate correctly.
−
Check the wiring of the
overtravel limit switches.
Correct the wiring of
the overtravel limit
switches.
page 5-28
The CCW-OT/CW-OT (CCW
Drive Prohibit or CW Drive
Prohibit) signal malfunc-
tioned.
Check for fluctuation in
the external power supply
(+24 V) voltage for the
input signals.
Eliminate fluctuation
from the external power
supply (+24 V) voltage
for the input signals.
−
Check to see if the opera-
tion of the overtravel limit
switches is unstable.
Stabilize the operating
condition of the over-
travel limit switches.
−
Check the wiring of the
overtravel limit switches
(e.g., check for cable
damage and loose
screws).
Correct the wiring of
the overtravel limit
switches.
−
The selection of the Servo-
motor stopping method is
not correct.
Check the servo OFF
stopping method set in
Pn001 = n.X or
Pn001 = n.X.
Select a Servomotor
stopping method other
than coasting to a stop.
page 5-29
Improper
Stop Posi-
tion for
Overtravel
(OT) Signal
The limit switch position and
dog length are not appropri-
ate.
−
Install the limit switch at
the appropriate posi-
tion.
−
The overtravel limit switch
position is too close for the
coasting distance.
−
Install the overtravel
limit switch at the
appropriate position.
−
Continued on next page.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference
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