YASKAWA SGD7S-R70A, Руководство по эксплуатации продукта

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8.3 Troubleshooting Based on the Operation and Conditions of the Servomotor
8-58
Absolute
Encoder
Position
Deviation
Error
(The posi-
tion that
was saved
in the host
controller
when the
power was
turned OFF
is different
from the
position
when the
power was
next turned
ON.)
There is a SERVOPACK
pulse counting error due to
noise.
Turn OFF the power sup-
ply to the servo system.
Check to see if there is
noise interference on the
I/O signal line from the
encoder or Serial Con-
verter Unit.
Implement counter-
measures against noise
for the encoder or
Serial Converter Unit
wiring.
–
The encoder was subjected
to excessive vibration or
shock.
Turn OFF the power sup-
ply to the servo system.
Check to see if vibration
from the machine
occurred.
Check the Servomotor
installation (mounting sur-
face precision, securing
state, and alignment).
Check the linear encoder
installation (mounting sur-
face precision and secur-
ing method).
Reduce machine vibra-
tion. Improve the
mounting state of the
Servomotor or linear
encoder.
–
A failure occurred in the
encoder.
–
Turn OFF the power
supply to the servo
system. Replace the
Servomotor or linear
encoder.
–
A failure occurred in the
SERVOPACK.
–
Turn OFF the power
supply to the servo
system. Replace the
SERVOPACK.
–
Overtravel
Occurred
The P-OT/N-OT (Forward
Drive Prohibit or Reverse
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.
–
The P-OT/N-OT (Forward
Drive Prohibit or Reverse
Drive Prohibit) signal
malfunctioned.
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
PnB1F.
Select a Servomotor
stopping method other
than coasting to a stop.
–
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