12.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
12-58
Absolute
Encoder
Position
Deviation
Error (The
position
that was
saved in the
host con-
troller when
the power
was turned
OFF is dif-
ferent from
the posi-
tion when
the power
was next
turned ON.)
The encoder was subjected
to excessive vibration or
shock.
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.
–
Replace the Servomo-
tor or linear encoder.
–
A failure occurred in the SER-
VOPACK.
–
Replace the SERVO-
PACK.
–
Host Controller Multiturn
Data or Absolute Encoder
Position Data Reading Error
Check the error detec-
tion section of the host
controller.
Correct the error detec-
tion section of the host
controller.
–
Check to see if the host
controller is executing
data parity checks.
Perform parity checks
for the multiturn data or
absolute encoder posi-
tion data.
–
Check for noise interfer-
ence in the cable
between the SERVO-
PACK and the host con-
troller.
Implement counter-
measures against noise
and then perform parity
checks again for the
multiturn data or abso-
lute encoder position
data.
–
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.
page 5-31
Check the settings of the
overtravel input signal
allocations (Pn50A/
Pn50B).
Set the parameters to
correct values.
page 5-31
The P-OT/N-OT (Forward
Drive Prohibit or Reverse
Drive Prohibit) signal mal-
functioned.
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.
–
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 = n.X or
Pn50B = n.X.
Check to see if the P-OT
signal is allocated in
Pn50A = n.X.
If another signal is allo-
cated in Pn50A
=n.X, allocate the
P-OT signal instead.
page 5-31
Check to see if the N-OT
signal is allocated in
Pn50B = n.X.
If another signal is allo-
cated in Pn50B
=n.X, allocate the
N-OT signal instead.
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference
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