YASKAWA SGM7D-30F Product Manual page 323

3.5 FT83 SERVOPACKs with Analog Voltage/Pulse Train References
3.5.9 Troubleshooting Based on the Operation and Conditions of the Servomotor
Problem
Overtravel
Occurred
Improper
Stop Posi-
tion for
Overtravel
(OT) Signal
3-254
Possible Cause
The P-OT/N-OT (Forward
Drive Prohibit or Reverse
Drive Prohibit) signal was
input.
The P-OT/N-OT (Forward
Drive Prohibit or Reverse
Drive Prohibit) signal mal-
functioned.
The selection of the Servo-
motor stopping method is
not correct.
The limit switch position and
dog length are not appropri-
ate.
The overtravel limit switch
position is too close for the
coasting distance.
Confirmation
Check the external power
supply (+24 V) voltage for
the input signals.
Check the operating con-
dition of the overtravel
limit switches.
Check the wiring of the
overtravel limit switches.
Check the settings of
PnB0F and PnB10.
Check for fluctuation in
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.
Check the wiring of the
overtravel limit switches
(e.g., check for cable
damage and loose
screws).
Check the servo OFF
stopping method set in
Pn001 = n.X or
PnB1F.
–
–
Continued from previous page.
Correction Reference
Correct the external
power supply (+24 V)
–
voltage for the input
signals.
Make sure that the
overtravel limit switches
–
operate correctly.
Correct the wiring of
the overtravel limit
–
switches.
Set the parameters to
–
correct values.
Eliminate fluctuation
from the external power
–
supply (+24 V) voltage
for the input signals.
Stabilize the operating
condition of the over-
–
travel limit switches.
Correct the wiring of
the overtravel limit
–
switches.
Select a Servomotor
stopping method other
–
than coasting to a stop.
Install the limit switch at
the appropriate posi-
–
tion.
Install the overtravel
limit switch at the
–
appropriate position.
Continued on next page.