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9.3 Troubleshooting Malfunction Based on Operation and Conditions of the Servomotor
9-29
Absolute Linear
Scale Position Dif
-
ference Error (The
positio
n saved in
the host controller
when the power
was turned OFF is
different from the
position when the
power was next
turned ON.)
(cont’d)
Host controller serial data reading
error
Check the error detection section of
the host
controller.
Correct the error detection section
of the host controller.
Check if the host controller is exe-
cuting data parity checks.
Execute a serial data parity check.
Check noise in the cable between
the SERVOPACK and the host con-
troller.
Take measures against noise, and
again execute a serial data parity
check.
Overtravel (OT)
Forward or reverse run prohibited
signal is
input.
Check the external power supply
(+24 V) voltage for the
input signal.
Correct the external power supply
(+24 V) voltage.
Check if the overtravel limit switch
operates properly.
Correct the overtravel limit switch.
Check if the overtravel limit switch
is wired correctly.
Correct the overtravel limit switch
wiring.
Check the settings for parameters
Pn50A and Pn50B.
Correct the settings for parameters
Pn50A and Pn50B.
Forward or reverse run prohibited
signal malfunctioning.
Check the fluctuation of the exter-
nal power supply (+24 V) voltage
for the input signal.
Stabilize the external power supply
(+2
4 V) voltage.
Check if the overtravel limit switch
operates correctly
.
Correct the overtravel limit switch.
Check if the overtravel limit switch
wiring is correct. (check for dam-
aged cables or loose screws.)
Correct the overtravel limit switch
wiring.
Incorrect forward or reverse run
p
rohibited signal (P-OT/N-OT)
allocation (parameters Pn50A.3,
Pn50B.0)
Check if the P-OT signal is allo-
cated in Pn50A.3.
If another signal is allocated in
Pn50A.3, allocate P-OT
.
Check if the N-OT signal is allo-
cated in Pn50B.0.
If another signal is allocated in
Pn50B.0, allocate N-OT.
Incorrect servomotor stop
method
selection
Check the settings for parameters
Pn0
01.0 and Pn001.1 when the ser-
vomotor power is OFF.
Select a servomotor stop
method
other than "coast to stop."
Check the settings for parameters
Pn0
01.0 and Pn001.1 when in force
control.
Select a servomotor stop
method
other than "coast to stop."
Improper Stop Po-
sition by Overtrav-
el (OT) Signal
Improper limit switch position and
d
og length
Install the limit switch at the
appropriate position.
The overtravel limit switch position
is to
o short for the coasting
distance.
Install the overtravel limit switch at
the appropriate
position.
Position Error
(Without Alarm)
Noise interference due to incorrect
linear scale connection
cable speci-
fications
The linear scale connection cable
must be tinned annealed
copper
shielded twisted-pair or screened
unshielded twisted-pair cable with a
core of 0.12 mm
2
min.
Use the specified linear scale con-
nection cable.
Noise interference due to length of
linear scale connection cables.
Check the length of the linear scale
connection cables.
The length of each cable must be
equ
al to or shorter than the maxi-
mum wiring length listed here.
• Connection cables for serial
con-
verter unit: 20 m
• Connection cables for linear
sc
ale: 15 m
• Connection cables for hall sensor:
15 m
Noise influence due to damaged lin-
ear scale connection cab
les.
Check if the linear scale
connection
cables are bent and the sheaths are
damaged.
Replace the linear scale connection
cables and
modify the cable layout.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions
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