YASKAWA SGD7S-R70A20A023F40B Product Manual page 145

Problem Possible Cause
The encoder was subjected
to excessive vibration or
shock.
The coupling between the
machine and Servomotor is
not suitable.
Position
Deviation
(without
Alarm)
Noise interference occurred
because of incorrect I/O sig-
nal cable specifications.
Noise interference occurred
because an I/O signal cable
is too long.
An encoder fault occurred.
(The pulse count does not
change.)
A failure occurred in the SER-
VOPACK.
The surrounding air tempera-
ture is too high.
The surface of the Servomo-
tor is dirty.
Servomotor
There is an overload on the
Overheated
Servomotor.
Polarity detection was not
performed correctly.
*
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)
5.1.7 Troubleshooting Based on the Operation and Conditions of the Servomotor
Confirmation
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).
Check to see if position
offset occurs at the cou-
pling between machine
and Servomotor.
Check the I/O signal
cables to see if they sat-
isfy specifications. Use a
shielded twisted-pair wire
cable or a screened
twisted-pair cable with
conductors of at least
2
0.12 mm .
Check the lengths of the
I/O signal cables.
–
–
Measure the surrounding
air temperature around
the Servomotor.
Visually check the surface
for dirt.
Check the load status
with a monitor.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between ±10°.
5.1 FT40 Specification
Continued from previous page.
Correction Reference
Reduce machine vibra-
tion. Or, improve the
mounting state of the
–
Servomotor or linear
encoder.
Correctly secure the
coupling between the
–
machine and Servomo-
tor.
Use cables that satisfy
–
the specifications.
The I/O signal cables
must be no longer than –
3 m.
Replace the Servomo-
–
tor or linear encoder.
Replace the SERVO-
–
PACK.
Reduce the surround-
ing air temperature to
–
40°C or less.
Clean dirt, dust, and oil
–
from the surface.
If the Servomotor is
overloaded, reduce the
load or replace the
Servo Drive with a
–
SERVOPACK and Ser-
vomotor with larger
capacities.
Correct the settings for
the polarity detection-
–
related parameters.
5
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