YASKAWA SGD7S-xxxDA0 series Product Manual page 569

Problem 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.
Overtravel
Occurred
There is a mistake in the allo-
cation of the P-OT or N-OT
(Forward Drive Prohibit or
Reverse Drive Prohibit) sig-
nal in Pn50A (250Ah) =
n.X or Pn50B (250Bh)
= n.X.
The selection of the Servo-
motor stopping method is
not correct.
The limit switch position and
Improper
dog length are not appropri-
Stop Posi-
ate.
tion for
The overtravel limit switch
Overtravel
position is too close for the
(OT) Signal
coasting distance.
16.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
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 the
overtravel input signal
allocations (Pn50A/
Pn50B).
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 to see if the P-OT
signal is allocated in
Pn50A (250Ah) =
n.X.
Check to see if the N-OT
signal is allocated in
Pn50B (250Bh) =
n.X.
Check the servo OFF
stopping method set in
Pn001 (2001h) =
n.X or Pn001
(2001h) = n.X.
Check the torque control
stopping method set in
Pn001 (2001h) =
n.X or Pn001
(2001h) = n.X.
–
–
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
page 6-26
switches.
Set the parameters to
page 6-26
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.
If another signal is allo-
cated in Pn50A (250Ah)
= n.X, allocate
the P-OT signal
instead.
page 6-26
If another signal is allo-
cated in Pn50B
(250Bh) = n.X,
allocate the N-OT sig-
nal instead.
Select a Servomotor
stopping method other
than coasting to a stop.
page 6-27
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.
16
16-63