YASKAWA S-V Series User Manual page 193

Problem Probable Cause
Forward or reverse run prohibited
signal is input.
Overtravel (OT)
Forward or reverse run prohibited
signal is malfunctioning.
Incorrect servomotor stop method
selection
Improper limit switch position and
Improper Position
dog length
to Stop by
The overtravel limit switch position
Overtravel (OT)
is too close for the coasting dis-
Signal
tance.
9.3 Troubleshooting Malfunction Based on Operation and Conditions
Investigative Actions
Check the external power supply
(+24 V) voltage for the input signal.
Check if the overtravel limit switch
operates properly.
Check if the overtravel limit switch
is wired correctly.
Check the settings for PnB0F and
PnB10.
Check the fluctuation of external
power supply (+24 V) voltage for
the input signal.
Check if the overtravel limit switch
operates correctly.
Check if the overtravel limit switch
wiring is correct. (Check for dam-
aged cables or loose screws.)
Check Pn001.0 and PnB1F when
the servomotor power is OFF.
Check Pn001.0 and PnB1F in
torque control.
−
−
(cont'd)
Corrective Actions
Correct the external power supply
(+24 V) voltage.
Correct the overtravel limit switch.
Correct the overtravel limit switch
wiring.
Set the parameters correctly.
Stabilize the external power supply
(+24 V) voltage.
Stabilize the operation of the over-
travel limit switch.
Correct the overtravel limit switch
wiring.
Select a servomotor stop method
other than "coast to stop."
Select a servomotor stop method
other than "coast to stop."
Install the limit switch at the appro-
priate position.
Install the overtravel limit switch at
the appropriate position.
9
9-23