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9 Troubleshooting
9-30
Position Error
(Without Alarm)
(cont’d)
Excessive noise to linear scale con-
nection cables.
Check if the linear scale connection
cables
are bundled with a high-cur-
rent line or near a high-current line.
Change the cable layout so that no
sur
ge is applied.
The FG potential varies because of
influence fr
om machines on the ser-
vomotor side such as the welder.
Check if the machines are correctly
gr
ounded.
Properly ground the machines linear
scale FG.
SERVOPACK pulse count error
due
to noise
Check if the I/O signal line from the
serial converter un
it is influenced
by noise.
Take measures against noise in the
serial converter unit wiring.
Excessive vibration and shock to
the
linear scale
Check if vibration from the machine
occu
rred or linear scale installation
is incorrect (mounting surface accu-
racy and fixing method).
Reduce the machine vibration or
mount the
linear scale securely.
Noise interference due to improper
I/O signal cable
specifications
The I/O signal 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 input signal cable with the
specified specifications.
If the reference pulse input multipli-
cation switching function is being
used
, noise may be causing the I/O
signals (/PSEL and /PSELA) used
for this function to be falsely
detected.
The I/O signal 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 input signal cable that satisfy
specifications.
Noise interference due to length of
I/O signal cable
Check the I/O signal cable length.
The I/O signal cable length must be
no more than 3 m.
A linear scale fault occurred. (The
pulse count does not change.)
Replace the linear scale.
A SERVOPACK fault occurred. Replace the SERVOPACK.
Servomotor Over-
heated
Ambient operating temperature too
high
Measure the servomotor ambient
op
erating temperature.
Reduce the ambient operating tem-
perature to 40C or
less.
Servomotor surface dirty Visually check the surface. Clean dust and oil from the surface.
Servomotor overloaded Check the load status with monitor.
If overloaded, reduce load or
repl
ace with larger capacity SER-
VOPACK and servomotor.
Polarity detection is not performed
correctly.
Check if the value of Un004 (elec-
trical angle 2 from polarity origin)
at an ar
bitrary position is between
10 degrees.
Correct the settings for the polarity
detection related parameter.
(cont’d)
Problem Probable Cause Investigative Actions Corrective Actions
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