YASKAWA SGD7S-1R9D, Product Manual

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15.4 Troubleshooting Based on the Operation and Conditions of the Servomotor
15-61
15
Maintenance
Position
Deviation
(without
Alarm)
The encoder was subjected
to excessive vibration or
shock.
Turn OFF the Servo Sys-
tem. 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).
Reduce machine vibra-
tion. Improve the
mounting state of the
Servomotor or linear
encoder.
–
The coupling between the
machine and Servomotor is
not suitable.
Turn OFF the Servo Sys-
tem. Check to see if posi-
tion offset occurs at the
coupling between
machine and Servomotor.
Correctly secure the
coupling between the
machine and Servomo-
tor.
–
Noise interference occurred
because of incorrect I/O Sig-
nal Cable specifications.
Turn OFF the Servo Sys-
tem. 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
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 Servo Sys-
tem. 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 Servo
System. Replace the
Servomotor or linear
encoder.
–
A failure occurred in the SER-
VOPACK.
–
Turn OFF the Servo
System. Replace the
SERVOPACK.
–
Servomotor
Overheated
The surrounding air tempera-
ture is too high.
Measure the surrounding
air temperature around
the Servomotor. Reduce the surround-
ing air temperature to
40
°
C or less.
–
The surface of the Servomo-
tor is dirty.
Turn OFF the Servo Sys-
tem. 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
overloaded, reduce the
load or replace the
Servo Drive with a
SERVOPACK and Ser-
vomotor with larger
capacities.
–
Polarity detection was not
performed correctly.
Check to see if electrical
angle 2 (electrical angle
from polarity origin) at any
position is between
±
10
°
.
Correct the settings for
the polarity detection-
related parameters.
–
Continued from previous page.
Problem Possible Cause Confirmation Correction Reference