5.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
5-50
*
Refer to the following manual for details.
Σ
-7-Series
Σ
-7S SERVOPACK with MECHATROLINK-III Communications References Product Manual
(Manual No.: SIEP S800001 28)
Σ
-7-Series
Σ
-7S SERVOPACK with MECHATROLINK-III Communications References and RJ-45 Connectors
Product Manual (Manual No.: SIEP S800001 62)
Position
Deviation
(without
Alarm)
The encoder was sub-
jected to excessive
vibration or shock.
Turn OFF the power supply
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).
Reduce machine vibra-
tion. Or, improve the
mounting conditions of the
Servomotor.
–
The coupling between
the machine and Ser-
vomotor is not suitable.
Turn OFF the power supply
to the servo system.
Check to see if position off-
set occurs at the coupling
between machine and Ser-
vomotor.
Correctly secure the cou-
pling between the machine
and Servomotor.
–
Noise interference
occurred because of
incorrect I/O signal
cable specifications.
Turn OFF the power supply
to the servo system.
Check the I/O signal cables
to see if they satisfy specifi-
cations. Use a shielded
twisted-pair wire cable or a
screened twisted-pair cable
with conductors of at least
0.12 mm
2
.
Use cables that satisfy the
specifications.
–
Noise interference
occurred because an I/
O signal cable is too
long.
Turn OFF the power supply
to the servo system.
Check the lengths of the I/O
signal cables.
The I/O signal cables must
be no longer than 3 m.
–
An encoder fault
occurred. (The pulse
count does not
change.)
–
Turn OFF the power supply
to the servo system.
Replace the Servomotor.
–
A failure occurred in the
SERVOPACK.
–
Turn OFF the power supply
to the servo system.
Replace the SERVOPACK.
–
Servomotor
Overheated
The surrounding air
temperature is too
high.
Measure the surrounding air
temperature around the Ser-
vomotor.
Reduce the surrounding air
temperature to 40
°
C or
less.
–
The surface of the Ser-
vomotor is dirty.
Turn OFF the power supply
to the servo system.
Visually check the surface
for dirt.
Clean dirt, dust, and oil
from the surface.
–
There is an overload on
the Servomotor.
Check the load status with a
monitor.
If the Servomotor is over-
loaded, reduce the load or
replace the Servo Drive
with a SERVOPACK and
Servomotor with larger
capacities.
–
Polarity detection was
not performed cor-
rectly.
Check to see if electrical
angle 2 (electrical angle from
polarity origin) at any posi-
tion is between
±
10
°
.
Correct the settings for the
polarity detection-related
parameters.
–
Estimating
the moment
of inertia
failed.
The acceleration rate is
low and travel distance
is short.
Check the Condition Setting
Dialog Box used to perform
moment of inertia estima-
tion.
Increase the acceleration
rate and travel distance.
–
Continued from previous page.
Problem
Possible Cause
Confirmation
Correction
Reference