8.4 Troubleshooting for Malfunction without Alarm Display
154
Abnormal
noise from the
servomotor, or
vibration from
the coupled
machine
Excessive vibration and
shock to the encoder
Check if the vibration from
the machine occurred or if
the servomotor installation
is correct (check for mount-
ing surface accuracy, fixing,
and alignment).
Reduce the machine vibra-
tion, or secure the servomo-
tor installation.
Incorrect filter setting
Check if the setting for the
reference filter (FIL) setting
is correct.
Increase the value of the
rotary switch.
Overtravel (OT)
(Movement
over the zone
specified by the
host controller)
The forward/reverse run pro-
hibited input signal does not
change. (P-OT (CN1-4) or
N-OT (CN1-3) is at H-level.)
Check if the voltage of +24
V external power supply for
input signal is correct.
Connect to the +24 V exter-
nal power supply.
Check if the overtravel limit
switch (SW) operates cor-
rectly.
Correct the overtravel limit
switch (SW).
Check if the wiring of the
overtravel limit switch (SW)
is correct.
Correct the overtravel limit
switch (SW) wiring.
The forward/reverse run pro-
hibited input signal does not
operate normally. (P-OT or
N-OT signal sometimes
changes.)
Check for the fluctuation of
the voltage of the +24 V
external power supply for
input signal.
Stabilize the +24 V power
supply voltage.
Check if the overtravel limit
switch (SW) operates cor-
rectly.
Adjust the overtravel limit
switch (SW) so that it oper-
ates correctly.
Check if the wiring of the
overtravel limit switch (SW)
is correct. (Check for dam-
aged cable or loose screws.)
Correct the overtravel limit
switch (SW) wiring.
The forward/reverse run pro-
hibited input signal (P-OT/N-
OT) is set to “Always
enabled.”
Check the parameter
Pn50A.3 “P-OT signal selec-
tion.”
Correct the setting of param-
eter Pn50A.3.
Check the parameter
Pn50B.0 “N-OT signal selec-
tion.”
Correct the setting of param-
eter Pn50B.0.
Improper position setting of
the overtravel limit switch
The distance to the over-
travel limit switch (OTLS) is
too short considering the
coasting distance.
Correct the OTLS position.
Noise interference because
of incorrect specifications of
encoder cable.
Check if twisted pair
shielded wires with core of
0.12 mm
2
are used.
Use the specified encoder
cable.
Noise interference because
the encoder cable wiring
distance is out of the specifi-
cations range.
The encoder cable wiring
distance must be 20 m max.
The wiring distance of the
encoder cable must be
within the specified range.
Noise interference because
of damaged encoder cable
Check if the encoder cable
is not pinched/bent or its
sheath is not damaged.
Modify the encoder cable
layout.
(cont’d)
Malfunction
Cause
Inspection
Corrective Actions
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